SEISMIC SITE-RESPONSE EXPERIMENTS FOLLOWING

THE MARCH 3, 1985 CEWTRAL CHILE EARTHQUAKE

(TOPOGRAPHICAL AND GEOLOGICAL EFFECTS)

Edited by

M. Cel ebi-

U.S. Geological Survey Menlo Park, California

Open-File Report 86-90

This report is preliminary and has not been reviewedfor conformity with U.S. Geological Survey editorial

standards and stratigraphic nomenclature.

TABLE OF CONTENTS

Page No.

Acknowledgments ....................................................ii

IntroductionM. Celeb-l

Data Acquisition SystemsJ. G-ibbsf 0. Jensen, G. Maxwell, E. Sembera, J. Sena, J. VanSchaack, R.E. Wawick, R.D. Bor>cherdtf C. Dietel, and J. Fletcher .......................................

Field Experiments: Layout, Site Selection, Site Description, and Field Playback

M. Cel ebi, E. Sembera, C. Dietel, L.F. Baeza ....................17

Data Processing and Calculation of Spectral Ratios .................50J. Watson and C. Mueller*

Preliminary Analysis of Results, Conclusions and Reccranendations ...57M. Cel ebi

Appendix A ..........................................................A

Appendix B ..........................................................B

ACKNOWLEDGMENTS

A project of this type cannot be accomplished firstly without financial

support and secondly without cooperation of institutions, officals and re­

search personnel. The editor of this report gratefully acknowledges the par­

tial financial support of the Office of Foreign Disaster Assistance (OFDA) of

the Agency for International Development (AID). This support was administered

through a grant to Dr. S.T. Algermissen of the U.S. Geological Survey (USGS).

In addition to this partial support, Dr. Algermissen provided advice and con­

sultation throughout the project. The mayor of the municipality of Vina del

Mar, Madame Eugenia Garrido gave full moral support and inspiration to the

project. Her staff, Luis Felipe Baeza, Hector Balbontin, Mario Mayo, and many

others very significantly contributed to the success of this project, and

their contributions are gratefully acknowledged.

Professors Rodolfo Saragoni and Edgar Kausel of the Civil Engineering

Department and Institute of Geophysics, respectively, of the University of

Chile, Santiago, and Professor Patricio Bonelli of the University of Santa

Maria in Valparaiso contributed to the execution of and discussions related to

the project.

Finally, Drs. Roger Borcherdt, William Joyner, and David Boore provided

many helpful suggestions and discussions before and after the mission.

Charles Mueller provided invaluable assistance in supervision of the data

processing. Drs. Gerald Brady and Paul Spudich carefully and extensively

reviewed the manuscript and offered valuable comments. Ray Eis and Lorraine

M. Hollis contributed with their artistic draft work. Barbara Gessner, as

always, patiently went through several drafts of typing effort. Gene Sembera

and Chris Dietel worked late hours and weekends during the field work and

Felipe Baeza was always there when we needed assistance. Without such advice

and support, a successful mission cannot be undertaken.

M. Celebi

Editor

11

INTRODUCTION

M. Celebi

The 3 March 1985 Central Chile Earthquake (Mg=7.8) occurred with signifi­

cant foreshocks and was followed by significant aftershocks (March 15, M=6.3;

March 17, M=6.6; March 20, M=6.0, and April 8, M=7.2). The main population

centers affected by the main shock and the aftershocks are shown in Figures 1

and 2.

The main event and the aftershocks caused a variety of natural hazards

ranging from liquefaction and slope failure to failure of some unique engi­

neered structures. These phenomena have been observed and preliminarily eval­

uated. Initial efforts in assessment of these effects of the earthquake are

being compiled in comprehensive reports by the Earthquake Engineering Research

Institute (Wyllie, and others, 1985), the United States Geological Survey (Al-

germissen, editor, 1985) as well as the Chilean scientists (Saragoni and

others, 1985). The latter report contains extensive information on the accel­

erogram records obtained during the main event .

In this report, some unique experiments performed almost five months af­

ter the main event on the Central Chilean coast will be described. These ex­

periments entail the study of specific site-response effects in the coastal

town of Vina del Mar, and Canal in Beagle, a subdivision of the same town. In

this report, the term site-response refers to variations in ground motions

caused by variations in geological structure and topography. The overall

geological formations of Vina del Mar, Canal Beagle, and Reneca, as well as

general topography and coordinates of the region are depicted in Figure 3.

The primary reasons for concentrating the efforts in this particular area

were:

o the extent of damage in some and yet lack of damage in other taller

structures (up to 24 stories) in Vina del Mar,

o the observations made during the previous trip (Celebi, 1985) ijmmedi-

ately after the main event that: a) at Canal Beagle there is a pos­

sibility of geological and topographical (ridge) effects, and b) in

Vina del Mar, there is a possibility of amplification of ground motions

at alluvial and sand sites compared with firmer rock sites.

o the strong desire to correlate the damage distribution information com­

piled by the Municipality of Vina del Mar with site-related amplifica­

tion studies.

M = 6.6

o o

33°

3/17/85

72°

f(M = 7.8)

MAIN SHOCK 3/3/85

SANTIAGO

= 6.0

3/20/85

Figure 1. General epicentral locations of the 3 March 1985 (M = 7.8) central Chile Earthquake and its aftershocks and main affected centers.

32 C 58

32°59

33°00'

33°OI

33°02CANAL BEAGLE

7 I C 38' 7I°30'

Figure 2. General locations of central Chile coast where the experiments were performed.

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The possibility that topography could cause the frequency-dependent

amplification of seismic waves has been investigated empirically and theoreti­

cally by Poore (1972 and 1973), Bard and Tucker (1985) and Davis and West

(1973). The current study presents a significant set of data reconfirming the

frequency dependent amplification of seismic motions at ridges. One addition­

al credit to be given to the current study is the fact that the seismograph

array was located in a heavily populated region and a distinct damage pattern

related to the ridge effect was observed. The other studies (Bard and Tucker,

1985; Davis and West, 1983) were performed in unpopulated or rural areas.

Studies of the type presented herein are necessary and useful for micro-

zonation of local areas in seismic zones of the world. By quantifying ampli­

fication due to local topography (hills and ridges), we can contribute to both

the local and overall understanding of this type of amplification. It may be

possible that similar topographical and geological conditions may exist in

close proximity to one another in other locales; therefore, results derived

from one location can be generalized to be applied at others subsequent to

additional studies. In Chile, for example, near Vina del Mar and beside Canal

Beagle there are several other subdivisions founded on ridges. One such sub­

division visited by the author was Gomez Carreno off Avenue Ste. Ines. The

four-story structures in this subdivision were of concrete-block or brick

masonry construction. A considerable number of these structures suffered

extensive damage during the 3 March 1985 event.

Extensive review and experimentation of amplification of ground response

at alluvial and other soft soil sites has been made in the San Francisco Bay

Area (Gibbs and Borcherdt, 1974) and in the Los Angeles area (Rogers, and

others, 1984) using pre-scheduled events of nuclear test explosions at Nevada.

Certainly, the 19 September 1985 earthquake records in Mexico City (Mg=8.1)

show that during that strong motion event the peak accelerations recorded in

Mexico at a rock site and an alluvial site were 0.034 g and 0.17 g, respec­

tively (Prince and others, 1985). Both of these records were obtained approx­

imately 400 km from the epicenter.

The field work described herein was carried out between July 26 and

August 10, 1985. This report describes the specific steps implemented during

the field work and the extensive data set that has been obtained. Preliminary

results and conclusions derived from the processing of the data set are pre-

sented. Participants in this field work were M. Celebi, E. Sembera, and C.

Dietel as well as Mr. Luis Felipe Baeza of the Municipality of Vina del Mar.

Planning of the experiments and day-to-day decisions were made by the author.

The significant quantity of data obtained was played back and processed under

the supervision of C. Mueller.

EXPERIMENTS CONDUCTED AND SCOPE OF THIS REPORT

The original objective of the field experiments as described above were:

1. To study topographical/geological amplification of ground motions at

the Canal Beagle subdivision of Vina del Mar;

2. To study geological amplification effects in Vina del Mar.

The scope of this report covers these two experiments only. However, in addi­

tion to the above experiments, two additional experiments because of conven­

ience and scheduling practicality were conducted, although the objective of

the mission did not require them. These additional experiments were:

3. Ambient and free-vibration tests of selected structures at Canal

Beagle and Vina del Mar;

4. Earthquake response of a 22-story structure in Vina del Mar.

These additional experiments are not within the scope of this report and will

be documented separately.

Furthermore, all data and results presented in this report are derived

from velocity recordings of motions. Studies of the data from acceleration

recordings of motions are currently being carried out.

REFERENCES

Algermissen, S.T. (editor), 1985, Preliminary Report of Investigations of the

Central Chile Earthquake of March 3, 1985: U.S. Geological Survey Open-

File Report 85-542.

Bard, P.Y., and Tucker, B.E., 1985, Underground and ridge site effects: A

comparison of observation and theory (paper submitted for publication -

advance copy courtesy of B. Tucker).

Boore, D.M., 1972, A note on the effect of simple topography on seismic SH

waves: Bulletin, Seismological Society of America, 62, No. 1, pp. 275-

284.

Boore, D.M., 1983, The effect of simple topography on seismic waves: implica­

tions for the accelerations recorded at Pacoima Dam, San Fernando Valley,

California, Bulletin, Seismological Society of America, 63, No. 5, pp.

1603-1609.

Borcherdt, R.D., Fletcher, J.B., Jensen, E.G., Maxwell, G.L., Cranswick, E.,

VanSchaak, J.R., Warrick, R.E., 1984. A General Earthquake Observation

System (GEOS), submitted to Bulletin, Seismological Society of America.

Celebi, M., 1985, Preliminary Field Trip Report on Chile Earthquake of March

3, 1985: Report to Earthquake Engineering Research Institute (April

1985).

Davis, L.L., and West, L.R., 1983, Observed effects of topography on ground

motion: Bulletin, Seismological Society of America, 63, No. 1, pp. 283-

298.

Gibbs, J.F., and Borcherdt, R.D., 1974, Effects of local geology on ground

motion in the San Francisco Bay region, California A continued study:

U.S. Geological Survey Open-File Report 74-222.

IAEE, 1972, Regulations for earthquake resistant design of buildings in Chile

from Earthquake Resistant Design Regulations - A World List): publication

of IAEE (International Association of Earthquake Engineering), Japan.

Prince, J., and others, 1985, Sismo del 19 de Septiembre Informs IPS-10 A, B,

C, Institute de Ingenieria, UNAM (University of Mexico).

Rogers, A.M., Borcherdt, R.D., Covington, P.A., and Perkins, D.M., 1984, A

comparative ground response study near Los Angeles using recordings of Ne­

vada nuclear tests and the 1971 San Fernando earthquake: Bulletin,

Seismological Society of America, 74, No. 5, pp. 1925-1949.

Saragoni, R., Fresard, M., and Gonzalez, P., 1985, Analisis de los accelero-

gramas del terremoto del 3 de Marzo de 1985, Universidad de Chile, Publi-

cacion ses 14/1985 (199), Dec. 1985.

Wyllie, L., and others, 1985, Chile Report (to be published by Earthquake

Engineering Research Institute).

DATA ACQUISITION SYSTHflS

J. Gibbs, G. Jensen, G. Maxwell, E. Serribera, J. Sena,

J. VanSchaack, P.F. Warrick, P.D. Borcherdt, C. Dietel, and J. Ft etcher

The experiment conducted following the earthquake of March 3, 1985 on the

west coast of Chile utilized a set of eight portable General Earthquake

Observations Systems (GEOS). This chapter provides a general description of

the instrumentation followed by a sunmary of the particular configuration used

for experiments described herein. A detailed description is provided by

Borcherdt and others (1985).

GENERAL DESCRIPTION OF RECORDING SYSTHU

The portable digital data acquisition system used for the experiments was

developed by the U.S. Geological Survey for use in a wide variety of both ac­

tive and passive experiments. The microcomputer based system was developed in

order that the system could be easily configured in the field to record sig­

nals for a variety of different experiments, including studies of strong

motion, structural response, source mechanisms, wave propagation studies of

aftershock sequences, crustal structure, teleseismic earth structure, near-

surface seismic structure, earth tidal strains, free oscillations and a varie­

ty of wave propagation studies such as those described in this report. Versa­

tility in system application is achieved by isolation of the appropriate data

acquisition functions on hardware modules controlled by a central microcomput­

er through a general computer bus. CMOS hardware components are utilized to

reduce quiescent power consumption to less than 2 watts for use of the system

as either a portable recorder in remote locations or in an observatory setting

with inexpensive backup power sources. The GEOS, together with two sets of

three-component sensors (force-balance accelerometers and velocity transduc­

ers) and a ferrite WWB antenna is shown in Figure 1. The hardware modules

comprising the system are shown in Figure 2.

The signal conditioning module for the GEOS is configured with six input

channels, selectable under software control, to permit acquisition of seismic

signals ranging in amplitude from a few nanometers of seismic background noise

to 2g in acceleration for ground motions near large events. The analog-to-

digital conversion module is equipped with a 16 bit CMOS analog-to-digital

converter which affords 96 dB of linear dynamic range or signal resolution;

this, together with two sets of sensors, implies an effective system dynamic

range of about 180 dB. A data buffer with direct memory access capabilities

allows for maximum throughput rates of 1200 sps or 200 samples/second/channel.

With sampling rates selectable under software control as any integral quotient

of 1200, a broad and variable system bandwidth ranging from 10~5 Hz to 5xlO%z

is available for recording signals from a wide variety of sensor types.

Modern high density (1600-6400 bpi) compact tape cartridges offer large

data storage capacities (1.25 - 33 Mbyte) in ANSI standard format, to facili­

tate data accessibility via minicomputer systems. Read capabilities of car­

tridge tape recorders can be utilized to allow recording parameters and system

operational software to be changed automatically. Read capability can be

utilized to allow systems equipped with modems to transmit data via telecom­

munications to a central data processing laboratory. Microcomputer control of

tiJTie standard provides capability to synchronize internal clock to internal

receivers (such as WWVB and satellite), external master clock, or conventional

digital clocks. Convenient system set-up and flexibility to modify system in

the field for a wide variety of applications is achieved using a 32 character

alphanumeric display under control of the microcomputer. English language

messages to operator executed in an interactive mode, reduce operator field

set-up errors. A complete record of recording system parameters is recorded on

each tape together with calibration signals for both the sensors and the

recorders. These records assure rapid and accurate interpretation of signals,

both in the field and in the laboratory.

Flexibility to modify the system to incorporate future improvements in

technology is achieved using a ringed software architecture and modular hard­

ware components. Incorporation of new hardware modules is accomplished in a

straightforward manner by replacing appropriate module and corresponding seg­

ments of controlling software. The flexibility afforded by microcomputer

technology to modify the system for specialized applications and to incorpor­

ate changes in technology allows seismic signals as detectable by a wide

variety of sensors to be recorded over a broad band of frequencies with high

resolution.

The system response designed for strong-motion and aftershock applica­

tions of the GBOS was intended to allow large amplitude near source signals of

9

1-10 Hz as detected by a forced-balanced accelerometer (FBA) to be recorded on

scale, while at the same time permitting much smaller amplitude high frequency

signals (50-100 Hz) as might be detected on FBA's or velocity transducers to

be recorded with high signal resolution. The design system response together

with that for two types of sensors frequently used for aftershock studies in

the near source region of large earthquakes is shown in Figure 3. With digi­

tization rates and anti-aliasing filters, selectable under software control,

the design system response allows signals ranging from essentially DC to 500

Hz to be recorded at high resolution without aliasing. Gain settings, select­

able under software control, allow two sets of three-component data, ranging

in amplitude over 180 dB, to be recorded simultaneously. Specifications for

the recording system are summarized in Table 1.

GENERAL DESCRIPTION OF DATA PLAYBACK SYSTEM

The read and write capabilities of the mass-storage module together with

the D/A conversion module permits the GEOS to be used as an analog as well as

digital (via RS-232) play back system in the field. Visual inspection of

digitally recorded data is useful for determining instrument performance,

evaluation of recording parameters, evaluation of environmental factors (e.g.,

local noise sources, etc.}. RS-232 capabilities of data playback unit and

ANSI-standard tape cartridges permit playback of digital time series on mini­

computer system in the field or laboratory. Digital playback of data is gen­

erally performed using an ANSI-standard serpentine tape reader as a peripheral

to minicomputer system in the laboratory. Deployment of minicomputer digital

playback systems in the field is generally most feasible for large scale high

data volume experiments.

RECORDING SYSTEM CONFIGURATION USED FOR CHILE EXPERIMENTS

For these experiments the recording system was configured as a six chan­

nel system. Channels 1-3 were set up to record the vertical, north-south, and

east-west components of motion as detected by 3 component force-balanced ac-

celerometers (Kinemetric FRA-13). Channels 4-6 were set up to record the ver­

tical , north-south, and east-west components of motion as detected by 3 com­

ponents velocity transducers (Mark Product, Ir-22). Specifications for the

sensors are summarized in Table 2. Calibration procedures for sensors are

described by Eaton (1975).

10

Each recording system was operated in trigger mode to permit on-site de­

tection of seismic events. Sampling rate for each channel was chosen at 200

sps, implying a Nyquist frequency of 100 Hz. High cut analog filters (seven

pole Butterworth, 42 dB/octave) with corner at 50 Hz were chosen to prevent

aliasing. Gain settings of 6 and 12 dp were chosen for the signals detected

by the acceleration sensors to permit any large amplitude near source signals

to be recorded on scale. Gain settings of 30 and 36 dB were used to record

smaller amplitude signals from more frequent small magnitude aftershocks to be

recorded on-scale with high resolution.

Accurate timing (± 5 msecs) for each of the recorders was obtained using

a portable master clock (model Mark I) synchronized with satellite time ob­

tained from the Geophysical Institute of University of Chile in Santiago.

Sensor calibration (applied DC voltage, velocity transducer; applied ± 12

volts FBA) and recording system calibration (voltage impulse, 5 sec Dirac

comb) were recorded on each cartridge tape to permit evaluation of system

performance and accurate relative calibration of recorders and sensors with

changing environmental conditions.

Data playback in the field was accomplished using a GEOS system config­

ured with a digital-to-analog conversion module and appropriate playback soft­

ware. Analog playbacks of data using a Soltec strip chart with light sensi­

tive film were used to visually inspect data in the field. Playback of

digital data to minicomputer was not undertaken in the field. A description

of the digital data played back from these experiments is described by Watson

and Mueller (this report).

REFERENCES

Aki, K., and Richards, P.G., 1980, Quantitative Seismology Iheory and. Methods,

vol. 1, W.H. Freeman and Co., San Francisco, California, 557 p.

Borcherdt, R.D., Fletcher, J.B., Jensen, E.G., Maxwell, G.L., VanSchaack,

J.R., Warrick, R.E., Cranswick, E., Johnston, M.J.S., and McClearn, R.,

1985, A general earthquake observation system: Bulletin, Seismological

Society of America, 75, no. 6.

Eaton, J.P., 1975, Harmonic magnification of the complete telemetered seismic

system, from seismometer to film viewer screen: U.S. Geological Survey

Open-File Report 75-99.

11

TABLE 1 - GBO^ Specifications

Microcomputer and Communications

Internal CPU: CMOS, 12 Bit. External CPU: optional. Data transfer:

Internal: Direct Memory AccessI/O Port: RS-232 compatible baud rate

programmable to standard rates.Telecommunications: UART, Modems optional.Analog playback via A/D.

Program Memory

Executable Memory: 8K 12 Bit word CMOS RAM. Program Storage: 16K 12 Bit word CMOS PROM. Alternate Program Storage: Programs may be stored

on magnetic tape for loading directly into programRAM.

Sensor Inputs and Signal Conditioning

Input Channels: 6 balanced differential Inputs, program selectable.

Preamplifier Dynamic Range: greater than 100 dB at 0dB gain, programmable in 6 dB steps 60 to 0 dB.

Filters: low pass Butterworth, 42 dB per octave;program selectable, 17 Hz, 33 Hz, 50 Hz, and100 Hz; high pass .1 Hz 6 dB per octave.

Calibration: Internal, automatic with or withoutsensors.

Transient Protection: ± 15 V

Analog to Digital Conversion

Resolution: 16 bits (1 part in 65,536).Stability and Linearity: ± 1 count-no missing codes

over full temperature range of -20°C to + 60°C. Conversion Rate (Total samples per second for all

active channels): 1200 samples per second maximum,.29 samples per second minimum; programmable as1,200/N where N is 1 through 4,096.

Pre-Event Data Memory

Size: 4,096 words, 16 bits per word.Pre-trigger memory: Five, 512 word blocks minimum

at 1,200 samples per second (2.14 seconds), six 512work blocks at 300 samples per second(10.24 seconds), program selectable.

Mass Data Storage/Retrieval

Cartridge: Read/Write 3M type, 1600 bpi.Tape capacity: 3,680 512 word blocks (1.88 million

samples) typical for 450 ft. tape, 26 minutes continuous record time at the maximum sample rate.

Tape Speed: 30 ips write or read.Slave Recorders: 2 optional, separate housing.

Time Control

External: WWVB Receiver: Automatic synchronization of

internal clock to WWVB under program command. Master Clock: Synchronization of internal clock

with external pulse and corresponding timecorrections derivable at selectable times underprogram command.

Manual: Time entered through keyboard andsynchronized manually.

Internal:Frequency: 3 MHz.Temperature Stability: ± 1 x 10" 6 ; - 20°C to+ 70° C.Aging Rate: less than 5 x 10 per year.

Operator Interface

Operation Environment: English language commandsunder software control.

Display: 32 character, alphanumeric display, 18segment, character height .15 in. LED with opticalfilters.

Keyboard: Mechanical switch with dust cover andwater seal, 20 button keyboard with numeric andfunction entry.

Status Checks: Time, battery voltage, no. of events,I of tape used, elapsed time since power on.

Debug: single and subroutine stepping.

Operating Modes

Self triggering: Near field: Selectable short term average (STA),long term average (LTA). ratio.

Teleseismic: Comparative ratios for two selectable frequency bands.

Pre-set time: record at selectable times andintervals.

Both: operate in both pre-set time and selftriggering modes.

Manual: record under keyboard control for start-stop functions.

Power Requirements

Voltage, current: + 24 VDC nominal ± 15*, 40 mA nominal in operating mode with display off, 300 mA nominal with display on, 600 mA with display or, and recording.

Internal batteries: ± 24 V, 5 AH Gates type, will operate about 3 days on internal batteries, connector provided for internal battery charging or external battery operation.

Physical and Environmental Requirements

Case Type: Waterproof aluminum case, 20 1/2" lore,9 7/8' wide 13 3/4" high.

Weight: 47 Ibs. with internal batteries. Operating Temperature Range: - 20°C to + 60°C, 15*

to 95% rel. humidity.

Patent pending.

12

TABLE 2 - Sensor Specifications

Velocity transducers:L22-3D (Mark Products)Natural freq.: 2 HzCoil Resistance: 5.5 K ftOutput: 0.5 v/cm/sDamping: 0.8 critical3 component pkg.: da., 18 cm; ht. 12 cm.

Forced Balanced Accelerometers: FBA-13 (Kinemetries) Range: ± 2 g full scale Output: ± 10 v full scale Natural Freq: 50 Hz 3 component pkg.; 14 x 14 x 8.5 cm

13

Figure 1. Side and front-panel view of the General Earthquake Observation System (GBOS), together with a WWVB ratio antenna and two sets of three-component sensors commonly used to provide more than 180 dB of linear dynamic range. System operation for routine applications requires only initiation of power. Full capability to reconfigure system in the field is facilitated by simple operator response to English-language prompts via keyboard.

14

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FIELD EXPERIMENT LAYOUT, SITE SELECTION, AND FIELD PLAYBACK

M. Celebi, E. Serribera, C. Dietel, L.F. Baeza

Deployment of the previously-described instruments at particular stations

required consideration of:

o Fulfillment of the objectives of the particular experiment;

o Accessibility to the particular site;

o Safety of the instruments;

o Optimizing the set of data which could be obtained with the limited

number of recording units available.

The two experiments constituting the subject matter of this report will be

described as the Canal Beagle and Vina experiments, and will be presented in

that order.

DEPLOYMENT OF DETRIMENTS FOR CANAL BEAGLE EXPERIMENT

The main objective of the Canal Beagle experiment was to investigate

possible a) geological, and b) topographical amplification. To achieve this, a

network of stations was established at this particular subdivision of Vina del

Mar. General location of these stations and topography can be seen in Figures

1 and 2. Specific descriptions of these stations are provided in Table 1.

Descriptive photos related to the Canal Beagle are referenced in Table 1.

REFERHCE STATIONS

These experiments were performed by establishing stations in accordance

with the described objectives. Throughout the whole duration of field work, a

reference station (VAL) was maintained at the University of Santa Maria in

Valparaiso. The location of this reference station is the same as one of the

strong motion stations of the Chilean strong-motion network. The reason why

this station was chosen as the reference station is two-fold:

o Its geological feature (amphibolite and granite gneisses) which makes

it the only rock site in close proximity to Vina del Mar.

o To provide data to correlate with the strong motion records of the main

event.

However, another reference station was established in downtown Vina del Mar at

the basement of the Municipality Building (an alluvial site). The main reason

for this choice was that it was impossible to occupy the same location as that

17

of the strong motion instrument site in Vina del Mar (also in the basement of

a building) because of a continuously running motor punp which could have con­

taminated the low level motions at this site. However, the new station (MUN)

was only one block from the actual strong motion station.

18

TABLE 1Canal Beagle Experiment Stations

(General layout Seen In Figures 1 and 2)

Station Description Reference Figure

Site Stations:

CBA At ground floor (no basement) of Type B* 1,2, 3-5 structure founded on a clear cut at canyon between two ridges. The structure and its twin next to it were not damaged. Geologic formation: sedimentary. (Building

CBB At ground floor of a Type B* structure on top 1, 2, 5, 11 of ridge where there is extensive damage. Geologic formation: Sedimentary and decom­ posed granite. (Building #7)

CBC (Same as above, CBB.) (Building #12) 1,2, 6-8

CBD At ground floor of a Type A* (single story)structure. This part of Canal Beagle is on 1, 2, 9 the main body of the hill crowned by the ridges. (699 Ventisquero Street - at corner of Canal Kivke Street)

CBE At ground floor (no basement) of Type C* (all 1, 2, 13 5 stories) structure located on top of emerg­ ing portion of the ridge. (Building #4 - Edificio Thomson)

CBF At ground floor (no basement) of Type C* (all 1, 2, 10, 12, 13 5 stories) structure located at the top of the ridge. (Building #15 - Edificio Hyatt)

CBG On a concrete floor of a single story structure 1, 2, 14 located in the canyon between the two ridges. The structure is not part of Canal Beagle subdivision.

Reference Stations:

VAL On a concrete pedestal at the University of Santa 15, 16 Maria. Same location as the ^A station of the Chilean strong motion network. The site is amphib- olite and granite gneiss formation.

MUN At basement of 2 story reinforced concrete struc- 17 ture on 615 Arlegui Street in Vina del Mar. The building is on alluvial ground and one block from the £MA station of the Chilean strong motion network.

There are three types of structures in Canal Beagle. Type A structures are single and two-story buildings on top of the hill, whereas Type B structures are four-story buildings on one ridge and Type C structures are five-story buildings on another ridge. Two of the Type B structures are in a canyon at the entrance to the subdivision.

19

ro

o

(4

TY

PE

B

S

TO

RY

B

UIL

DIN

GS

)

2 T

YP

E

B

BU

ILD

ING

S

UN

DA

MA

GE

D

TY

PE

C

S

TO

RY

B

UIL

DIN

GS

)T

YP

E

A

C1

AN

D

2 S

TO

RY

B

UIL

DIN

GS

)

unid

ad

veci

nal

N

° 7

6

CA

NA

L B

EA

GL

E

Sec

tor

K-

Ach

up

alla

s

TY

PE

A

-

10

00

u

nit

s

TY

PE

B

-

20

0

un

its

TY

PE

C

-

320

un

its

Fig

ure

1

. G

ener

al

layout

of

Can

al

Bea

gle

subdiv

isio

n.

The

th

ree

rid

ges

cr

owni

ng

the

mai

n hil

ltop

(whe

re T

ype

A buil

din

gs

are

loca

ted)

are

indic

ated

. D

amag

ed f

our

sto

ry

(Typ

e B

) an

d fi

ve

story

(T

ype

C)

bu

ild

ing

s ar

e lo

cate

d o

n ri

dges

2

and

3,

resp

ecti

vely

.

33°02'

Figure 2. Detailed topography of Canal Beagle. The stations of the Canal Beagle site are indicated. Also a general scale and the latitudes and longitudes are shown.

21

Figure 3. Type B structure (no damage) at Canal Beagle where station CBA was sited. The structure is at the entrance to the Canal Beagle sub-

, division and is located in a canyon between two ridges.

Figure 4. Cut behind the two undamaged Type B buildings in the canyon at the entrance to Canal Beagle.

22

Figure 5. Type B structure (heavily damaged) on top of one of the ridges where station CBB was sited. A recent cut on the hillside displays the general status of the geological formation alluvial conglorner-

23

i Figure 6. Type B buildings on the slopes of one of the ridges at Canal Beagle. The first building is the site of station CBC. r

Figure 7. Site of station CBC. Note the extensive damage to the concrete walls and infill brick walls.

24

- -I

Figure 8. Close-up of damage to the Type B buildings (site of station CBC).

25

Fieure Figure Site of station CBD - Type A building on top of the hill crowned by There were ^ dajnages to this buiiding or other Type A

buildings.

buildings (5 stories) all extensively damaged.

26

Figure 11. Type B buildings on top of the ridge, is seen here.

General view of the ridges

Figure 12. Type C buildng on top of the ridge. Station CBF was sited on the ground floor of the building. A general view of the ridge is also seen in the figure.

27

Figure 13

. Pa

nora

mic

view

of

Type C

bui

ldin

gs (a

ll fi

ve st

orie

s) on t

op of one of t

he r

idges

at

Canal

Beagle.

All

buil

ding

s are

severely d

amaged.

Note t

he s

teep

slopes.

Figure 14. Locations of station CBG - in a canyon between two ridges. On top of the ridge, Type C buildings are seen.

29

71° 36.5

d« los L«ch*ro» ^

-33°2.6'

Figure 15. Nation of reference station VAL-a granite and amphiobolite gneiss site (Figure adopted frcm Algermissen, 1985).

30

71°35' 71°34'

33C01'30" -

33°02'00" -,

(UNIV. OF SANTAO VAL

(ROCK SITE)

FigLire 16. Location of reference station VAL.

31

Figure 17. Reference station VAL located at a vault within the University of Santa Maria (Valparaiso) Campus. This is the same location as the SMA station of the Chilean Strong Motion Accelerograph Network.

I

Figure 18. Reference station MUN at thein Vina del Mar. The building is

3:2

basement of the Municipality Building bund on alluvial deposits.

The selection of specific sites for site response studies in Vina del Mar

was greatly facilitated by the use of preliminary damage concentration maps

compiled by the Municipality (Balbontin and others, 1985). Based on these

maps, various stations were established on sandy, alluvial, and granitic

sites. The reference station, VAL, established at the beginning of the previ­

ous experiment at Canal Beagle was kept as such (Figures 15-17). The loca­

tions of the stations in Vina del Mar and Reneca are depicted in Figures 19-

21. For security reasons and protection against weather conditions, the

instruments were located at basements or ground floors of structures.

The sand sites consisted of the ocean front areas where Edificio Acapulco

and Edificio H'Angoroa (the two taller strutures that were severely damaged

during the main event) (Wyllie, and others, 1985 and Celebi, 1985) as well as

Edificio de Miramar (one of the undamaged four 22 story reinforced concrete

structures with triangular shape in plan) are located. Stations EAC, RAN, and

TRA were sited in the basements of Edificios Acapulco, H'Angoroa, and de

Miramar, respectively. In addition, another site was occupied near the site

of Edificio El Faro (the eight-story building in Reneca that tilted and was

later dynamited).A I

The alluvial sites were the Municipality Building (MUN), Edificio Liber-

tidad de Chile (ELC), Edificio Emparte (FMP) and the Church Building (CHU).

The firmer decomposed granite and granite sites were one of the four towers of

the Quinto Claude Complex (22 stories, block 2) (OCL), the Sietes Hermanas

(HER) and Santa Ynez (YNE) (2075 at 24 Norte).

More detailed particulars of all stations in the Vina experiment are

summarized in Table 2 along with reference figures.

STATION SCHEDULING, INSTRUMENT POSITIONING AND ADJUSTMENTS AND FIELD PLAYBACK

In general, instruments at established stations were relocated to other

locations (new stations) only after making sure that a sufficient number of

events were recorded at several of the stations. Thus, comparisons of motions

(or transfer functions) at one station with respect to another could be made.

However, in a couple of cases (e.g., station CBG at Canal Beagle), the instru­

ments were relocated even though no events were recorded to provide qualita-

33

,r

tive comparison. In certain situations the instruments were relocated even

though no events were recorded and results from another similar station (sta­

tion CBA) could be used. A general schedule of the location of GEOS recording

systems is shown in Table 3. General views of the instruments used (GEOS

recorder, batteries, and transducers) are seen in Figure 29.

The velocity and acceleration sensors were always leveled. The horizon­

tal components were aligned to true north direction using a compass.

Instrument gains were set generally at 36 dB for velocity sensors with

the expectation of recording aftershocks in the magnitude 3 to 5 range. Gains

for acceleration sensors were set generally at 12 dB for possible aftershocks

greater than magnitude 5. These gains proved to be suitable after examination

of the initial aftershock data on the GEOS analog playback oscillograph util­

ized in conjunction with a visicorder. In many instances, the events played

back on the visicorder showed the amplification expected between the accelero­

grams obtained from different stations.>' '

V ' *

REFERENCES

Balbontin, H., and others, 1985, Danos Viviendas Sismo 1985, Direccion de

Planificacion y Asesoria Urbana, Municipalidad Vina del Mar.

Celebi, M., 1985, Preliminary field trip report on Chile Earthquake of March

3, 1985: Report to Earthquake Engineering Research Institute (April

1985).

Wyllie, L., and others, 1985, Chile Report (to be published by Earthquake

Engineering Research Institute).

34

TABLE 2VINA EXPERIMENT STATIONS

(General Layout Seen in Figures 19 and 20)

Station Description Reference Figure

Sand Site Stations on Level Ground: *T

_EAC At the lower level of the two-level basement 19, 21, 22 of the 15 story reinforced concrete shear wall building whose plan is "fishbone shaped" (Edificio Acapulco). The structure was severely damaged during the main event. The building sits on the sand beach of Avenue San Martin.

HAN At the lower level of the two-level basement 19, 21, 23 of the 15 story reinforced concrete shear wall structure (Edificio H'Angoroa), severely damaged during the main event. The building is next to Edificio Acapulco on the sand beach of Avenue San Martin.

TRA At the lower level of the two-level basement 19, 24 (garage) of the 21 story (not including base­ ments) reinforced concrete structure (Edificio de Miramar) which was not structurally damaged

; during the main event. The building is one of 4 similar structures alongside Avenue San Martin.

- (Four more stations were located in this building as part of other experiments to be reported separ­ ately.)

RM This site was specifically chosen to study site 20, 25 response on the sandy hills of Reneca'. The specific station chosen on the ground floor of a single story building was in the immediate vicin­ ity of Edificio El Faro which was severely damaged and tilted during the main event and as a conse­ quence was later dynamited.

Alluvial Stations on Level Ground:

MUN Same as previous experiment (See Table 1). 18, 19

ELC Edificio Libertido Centro. (at 570 Libertido 19, 26 Street), 14 stories including 1 floor of basement. A reinforced concrete frame structure, suffering very minor damage during the main event. The location is on alluvial ground. -1

35

TABLE 2 (Continued) VINA EXPERIMENT STATION

Station Description Reference Figure

BMP Edificio Bnparte' on 15 Norte Street. 19, 27Block C4 of 19 similar social housing

"' apartments. 5 story reinforced concrete framed building. The building is on level alluvial ground. Four of the 19 buildings were damaged.

CHU Espiritu Santo Church at the intersection of 19, 28 Llay Llay and Caucha Streets. Masonry struc­ ture on alluvial site. Severely damaged. Buildings around this church including a

... children's hospital (Hospital de Ninos) also; damaged.

Rock Sites on Hills:

QCL Block 2 of the 22 story (plus two story 19, 29 basement) Quinta Claude structure (reinforced concrete frame with core shear wall) . These structures were built on granitic rock and suffered negligible damage.

HH&, In the basement of one of the Sietes Hermanas 19, 30 Buildings (4-10 stories) which suffered minor structural damage during the main event. Most of the external stairways giving access to the structures from the exterior or access between buildings were damaged. The site is decomposedgranite on a hill.

%YNE One of two 5 story reinforced concrete framed 19, 31

structures (with brick infill walls) located on hill at 24 Norte Street off Avenue Santa Ynes. Minor damage during the main event. Instrument located in basement. The site is granite or decomposed granite.

Reference Rock Site: '

VAL Same as Table 1. . - \ 15-17

GEOS 2

5

TABLE

3RECORDER DEPLOYMENT SCHEDULE AT

STATIONS

Recording

Unit

GEOS

19

GEOS 17

GEOS

23

GEOS 3

GEOS 13

GEOS 15

GEOS 12

7/27/85

Juli

an:

208

(VAL

) 14

:03 GMT

(MUN

) 14

:40 GM

T

(CBA

) 17

:22

GMT

(Date

and

Stations- In

stal

lati

on T

imes

(GMT)

of s

ome

stat

ions a

re i

ndic

ated

)

7/28/85

7/29

/85

7/30

/85

7/31

/85

8/1/85

8/2/85

8/3/85

8/4/85

8/5/85

209

210

211

212

213

214

215

216

217

(CBB

) 18:30 GMT

(CBC

) 18:48

(CBD

) 19

:14

(CBE

) 19:43

(this

stat

ion

was

operated c

onti

nuou

sly)

(HAN

) (R

EN)

(TRD

) 20:20:03

(EMP

) (T

RB)

15:4

8 GMT

(HER

) (MUN)

16:50 GM

T 15

:56

(ELC)

(TRC

) GM

T 21

:19

(QCL

) (CHU)

T0GM

T (2

1:00

GMT)

(EAC

) (T

RE)

GMT

21:3

9

8/6/85

8/7/85

8/8/85

218

219

220

) » Sa

ntia

go

)* S

antiago

)*

) » Sa

ntia

go

Cartegena

)+

)* S

antiago

(CBF

)(CBG)

(YNE

) 17

:30 GM

T 20

:11 GMT

(TRA

))*

San

tiag

o

7V 32°59'00'

71°33' 71°32f

32°59'30* -

33001'00*

32°01'30'

EDIFICIO DE *-* / MIRAMAR*

TRA/A . TT£..(SAND);, ,. o&%«

* x.^ *-~i**/^rwr> >''"--

-EDIFICIO -/ ACAPULCO

EAC *

(ALLUVIAL SITE)

^

(GRANITE DECOMPOSED QcLm&

(GRANITE ANDDECOMPOSE

Figure 19. Location of stations in Vina del Mar,

38

71°33 f 71°32 f

32°58'00"

32°58'30 -

32°59'00*

Figure 20. Location of station REN in Reneca. well as a general scale is shown.

Latitudes and longitudes, as

39

EDIFICIO HANGAROA

( 15 ttoriet

EDIFICIO ACAPULCO

PLAZA DEL MAR

~i

9th NORTH

zp cc

z(0

LUD Z L1J

EDIFICIO MARINA REAL

StTTNORTH

Figure 21. Locations of Edificio Acapulco and Edificio H'Angaroa severely damaged modern engineered buildings, on Avenue San Martin.

40

PLAN VIEWTiaur* MS MMtf* M«if 3*. J." *.* *" f f '

DAMAGE PATTERN

EDIFICIO ACAPULCO

Figure 22. Plan view, qualitative damage pattern and view of the extensive damage to the exterior shear wall of Edificio Acapulco station EAC. (Plan view of the building is provided by Prof. P. Bonelli).

41

EDIFICIO HANGAROA

Figure 23. Plan view, qualitative damage pattern and general view of Bdificio H'Angoroa station HAN. The slabs and shear walls cracked exten­ sively from top to ground floor. (Plan view of the building pro­ vided by Prof. P. Bonelli).

42

EDIFICIO DE MIRAMAR

Figure 24. General and plan views of Bdificto de Miramar, one of the several twenty-two story buildings that survived the main event without damage.

43

EDIFICIO EL FARO

Figure 25. General view of Edificio El Faro (on sand dune hills of Reneca)after the main event. The building was later dynamited. Station REN was sited on ground floor of a single story building immediately adjacent to Edificio El Faro.

44

Figure 26. General view of Bdificio Libertidad de Qiile (Station EL£),

i Figure 27. Edifice Fmparte (Station FJUP) one of nine similar buildings that I suffered moderate damage during the main event.

I

45

05

Fig

ure

28.

Chu

rch

buil

ding

on

th

e le

ft

(sta

tion

CH

U),

Hos

pita

l de

N

inos

ne

xt

to it

(o

n th

e ri

ght

top)

an

d si

ng

le

sto

ry m

ason

ry st

ruct

ure

s in

th

e sa

me

vic

init

y

(on

the

right

bott

om).

A

ll

thes

e st

ruct

ure

s w

ere

mod

erat

ely

dam

aged

dur

ing

the

mai

n ev

ent.

Figure 29. Two of the four twenty-two storybuildings with shear walls (statior of block 2 at the right). These granite hills, suffered no damage.

reinforced concrete Quinte Claude QCL was sited at the basenent

buildings, situated on decomposed

Figure 30. Two of the several buildings situate< sited in the event, the sky-'

basenentwalkways

reinforced concrete shear wall Sietes Hermanos on decomposed granite hills. Station HER was

of one of these buildings. During the main and stairs suffered extensively.

Figure 31. One of the two buildings' on decomposed granite hills of Avenue Ste. Ynez. Station YNE was located in the basement of this building (minor dariage during main event).

L

Figure 32. General view of GEOS recorder, batteries and sensors at a particu­ lar site and check being performed to determine whether events have been recorded.

49

DATA PROCESSING AND CALCULATION OF SPECTRAL RATIOS

byJohn C. Watson and Charles S. Mueller

This section constitutes a description of the procedures used for pro­

cessing the extensive set of digital strong motion recordings obtained from

aftershocks following the May 3, 1985 Chile earthquake (Ms=7.8). Two

overlapping studies conducted during late July and early August of 1985

resulted in 40 DC300XL data cartridges from 18 stations recorded on wide

dynamic range GEOS instruments (Borcherdt and others, 1984). Each GEOS

operated in trigger mode, simultaneously recording six channels of ground

motion at 200 samples-per-second-per-channel; namely, three-components of

ground acceleration (Kinemetrics FBA-13 force balance accelerometer) and three

components of velocity (Mark Products L-22 geophone). The FBA's were recorded

at relatively low gain in order to obtain undipped recordings of large ground

motions while the geophones were recorded at higher gain. The combination

allowed high signal-to-noise recordings over a range of ground motion ampli­

tude to be obtained. No clipped records were observed. Each GEOS clock was

set once at installation using a portable master clock; therafter clock

corrections were obtained approximately once every twenty-four hours when the

sites were visited for tape changes. Other GEOS parameters are described

elsewhere in this report.

Data cartridges were returned to Menlo Park for processing. During play­

back, the computer directory structure (and the subsequent magtape archival

structure) was organized by increasing trigger-time. Data cartridges were

played-back with a Tandberg TDC3000 digital cartridge recorder onto a PDPll/70

minicomputer. The software interface is the FORTRAN program RDGEOS written by

Gary Maxwell of the USGS, Menlo Park. The data were demultiplexed and stored,

one trace per file, in blocked binary format. Each file name consists of 13

characters following the USGS Branch of Engineering Seismology and Geology

filename convention:

character 1-3 Julian day

character 4-5 hour

character 6-7 minute

character 8 seconds (A = 0-3, B = 3-6, C = 6-9,..., T = 57-60)

character 9 motion (1-3 = acceleration, 4-6 = velocity)

character 10 period (.)

character 11-13 station-instrument identifier.

50

Each file consists of two header blocks which contain relevent field and

playback parameters followed by data blocks.

Figures 1 and 2 are plots of all trigger times versus Julian day for the

Canal Beagle and Vina del Mar studies, respectively. With the files on disk

two archival tapes were made and all seismograms were plotted for preliminary

seismic interpretation. The data set was then winnowed so that single-station

triggers were excluded. Considering the overall network configuration, a

twenty second sliding window was chosen in order to select common-event trig­

gers. The winnowed data set was then copied to the VAX-11/750 minicomputer

for more detailed seismic analysis. Tables 1 and 2 list aftershocks recorded

at two or more stations for the Canal Beagle and Vina del Mar studies, respec­

tively. The three-letter station-instrument codes appear in the first row and

the origin times of events appear in the first column. If a station recorded

an event, character 8 of the filename (the trigger-time seconds character, a

useful file identifier) appears in the table. Of 355 triggers from nine sta­

tions during the Canal Beagle study (including stations VAL and MUN, which are

ccranon to both studies), 29 were earthquakes recorded at two or more stations,

11 at four or more stations, and six events at six or more stations. Of 491

triggers recorded from 11 stations during the Vina del Mar study (including

stations VAL and MUN) 27 were earthquakes recorded at two or more stations,

seven at four or more stations, and two at six or more stations.

Plots of vertical and horizontal (N-S and E-W) components of velocity for

all events recorded at two or more stations were made. Velocity records gen­

erally provide better results; therefore, only velocity seismograms are

plotted herein (acceleration time histories are currently being studied and

processed by the editor of this report). These plots of velocity seismograms

and related spectra are provided in Appendices A and B for the Canal Beagle

and Vina experiments, respectively. Indexing of events, and descriptions of

the plots are also provided in these Appendices. In the plots, a positive am­

plitude for the vertical ground motion corresponds to upward motion, and for

the horizontal ground motions, positive amplitudes correspond to northward and

eastward motions for the N-S (H=0) and E-W (H=90) directions, respectively.

In order to characterize the site-dependence of ground motion in the

Canal Beagle and Vina experiments, spectra and spectral ratios were calculated

from whole-record waveforms. For recordings made at closely-spaced sites

51

(relative to the focal distance), spectral ratios tend to deemphasize common

source and whole-path wave-propagation effects, and emphasize local wave-

propagation differences. The experiments described in this report were so

designed.

To calculate amplitude spectra, waveforms were windowed (to insure equal-

length numerator and denominator and not to isolate phases), DC corrected, ta­

pered (10% cosine front and back), padded with zeros to an integral power-of-2

number of points, and fast-Fourier transformed. Spectra were not corrected

for instrument or anti-alias-filter response; these effects are assumed to be

common to all instruments to the level of detail considered here and, there­

fore, to cancel in spectral ratios. Spectra were smoothed with a running

triangle (width ~ 0.5 Hz) prior to obtaining ratios. All spectra are plotted

up to 30 Hz and signal-to-noise is generally adequate in this band for the

best recorded events (Figure 3).

Fourier amplitude spectra and spectral ratios accompanied by windowed

time series are provided in Appendices A and B for the Canal Beagle and Vina

experiments, respectively.

REFERENCE

Borcherdt, R.D., Fletcher, J.B., Jensen, E.G., Maxwell, G.L., Cranswick, E.,

VanSchaack, J.R., Warrick, R.E., 1984. A General Earthquake Observation

System (GEOS), submitted to Bulletin, Seismological Society of America.

TABLE 1. Events recorded on two or more stations (Canal Beagle Experiment)

\2090350A ^0S I7fl 11* - 2091723G 20918491 2091915C

2091921F2092020F2100011G

21C0710G2100711H2101029N2101044E210144612101536A21016C9N2101816B21C1919H2101926C21C2C23L2110059F2110337D211C6C2A2110933S2111026B2111208fc211122K;211U30K

*AL

FG~S

H

IBKBH0LPD

6

F0

HUN CBA _ _A__

G 1J C

FF

-- -" £GI

hB

P

6 6F

H H

CEEA

15G1h £0

Kfeh

LFC

6- gR

£

I CBC

1

sGIN

_ --f'

ANEhF

PIAg-RU

CBD CEE

H

K

K-- - -5, G

______

NBH

P

5 5

R R

: CBF CBG

HSG1------ - - - - - ------

JAN - BKP

~jpDAS_ -R

M

TABLE 2. Events recorded on two or more stations (Vina Experiment)

WHERE OUTPUT,

2091701R 2092020F

2111208P 2121822L 2130430P

2131743* 2140256D 2141457H2141800J 2150204N 2150337K 2160018K

2160125Q 2160336H 21604470

2160657J 2161006F 2161857F/I? jvu/r 2191110K 22006060 2220853E

TBACK VAL

F sR L P

M D K

N K

IG

0

L

F

K 0E

- 5.0, TAHEAD= 20.0. 2 RECORDS NUN QCL ELC EAC HAN EMP HER D F- -5 - H

L P

SU fcf f*(

D

S 0 ' N K K K

M0

H 0

J J J G

G G

LP E

TO DECLARE AN EVENT. YNE REN CHU TP.A

F

M

JN N K

" ---H " ' ' ' '- ' ' 0

tt G 0

J J F F

G G

L

53

cnN

ni

BERG

LE 7

/25/85

208

CB

G-

CB

F-

CB

EH

UJ z:

CB

D-

co

2 i i i o I I I

cr CO

CB

C-

CB

B-

CB

fl-

MU

N-

VflL

- 208

209

210

211

(6 COMPONENT GE

OS)

212

213

-»+

4+-H

--H

W-

-HW

-

+

-H-

-H-+

-H4-

-H

- +

+

4+

+

+

+

-H-

++

-H--

W-

HH

+ +

+

-H-H

- +

i l

I n

t _

_ II

III M

l T

IT

Illll II

I I I

I II

II I

++

+ +

*

+

-*+

+

+ +

-H

-H-+

-H-

+H-

+

HH

fr

209

210

211

JULI

RN onr

212

213

Figu

re 1

. Re

cord

ing

vs.

time p

lot

(Can

al Be

agle

Exp

erim

ent).

1, (Each "+"

repr

esen

ts a

trig

ger)

en

en

VIN

fl

DE

L

Mfl

R

7/2

6/8

5

(6

CO

MPO

NE

NT

G

EO

S)

208

209

210

211

212

213

21M

21

5 21

6 21

7 21

8 21

9 22

0 22

1 22

2 22

3 22

4

TR

R-

CH

U-

RE

N-

YN

E-

ID

OC

I -

CDH

ER

-

" E

MP

H

o I 4

EflC

HCE h- CD

ELC

-

OC

L-

MU

N-

VflL

-

-H-

-4W

- -tt

--H

-

+ +

-t-

-H

H-H

- +

_M_

_i_

ii i

n

ii

« j i

JX

- ii

i

i 11

1 it

t

"IT

T "

II I

II

II1

'1'1

't"

TT

T

t II I

tt'II

I

Jl,

I

IIJ^

I

L

1 t

I M

ill,

_1

.IJ_

J

ll

I II

iT

T

1IT

T

T T

II ! tr

"

IT H

i'1

11

+

+

m

ilil

Mit

a i

m*

ii

i T

tiT

nO

Bn

r

1 TO

"

Tr T

HHH

+

-f-

+ 4

H-+

HH

+ -f

HB

-f-

+ H

Hf

-f

HH

IH-f

-«

-f-

HW

H+

III

Hill

-f- -f

-f

-H--

H-H

H+

+-

HH

«

+

+

i I

i i

i I

i i

i I

i i

i I

i i

i

tt- HU

H II

I -t

-HH

flh

-tt-H

- -m

-f

+-H

-4+

-H

++

I i

i j

I _j

i_i

I

i_i

I i

. i

I i

. i

208

209

210

211

212

213

21M

215

216

217

218

JULIflN DRY

219

220

221

222

223

224

Figu

re 2

. Re

cord

ing

vs.

time

plo

t (Vina

Experiment)] (Ea

ch "+

" represents a

trigger)

2111208R

ii.C

BR

V

OP

S-R

OC

2111

208R

5.CB

R H«0

OPS-ROC

2111208R6.CBfl H-90

OPS-ROC

0.04 r

0.0

2

-0.0

2

-0.0

15

10

SE

CS

15

0.0

4 r

0.0

2

-

-0.0

2

-

-0.0

45

10

SE

CS

0.01

0.00

1

10'

10'

P-W

AVE

........'... M

A A

A.'.

0.01

0.00

1

10'

10'

10

20

30

0 H

Z10

20

0.01

0.00

1

10"

30

10'

HZ

10

20

H

Z30

Figure

3. Spectral

signal-noise comparison

for

a ty

pica

l th

ree

comp

onen

t re

cord

ing

(eve

nt 2

1120

8 at

st

atio

n CBA).

PRELIMINARY ANALYSES OF RESULTS, OONCLOSIONS AND REOCMMHTOATIONS

M. Cei ebi

The seismograms, Fourier amplitude spectra, and spectral ratios presented

in Appendices A and B constitute a significant percentage of the processed

data from the Canal Beagle and Vina experiments, respectively. At the time of

preparation of this report, the epicentral distances, magnitudes, and other

relevant information of events presented herein were not yet available from

the Geophysical Institute of the University of Chile in Santiago. However,

even without this information and because the stations established were close

to one another (as compared to epicentral distances), for each one of the

events, the velocity seismograms (presented in Appendices A and B) obtained

from different stations visually depict the degree of overall amplification of

motions at one site relative to another.

Although this data set is currently being analyzed for other purposes, in

this section the spectral ratios obtained from velocity seismograms are exam­

ined more closely with respect to amplification at specific sites. By this

method, it is intended to distinguish between the topographical and geological

amplification at different sites.

In order to draw conclusions related to practical engineering and to cor­

relate the results with the damage distribution at Canal Beagle and Vina del

Mar, selected spectral ratios corresponding to pairs of stations presented in

Appendices A and B have been replotted for frequencies 0-10 Hz and with a

standard format. The main reason why spectral ratios are replotted for 0-10

Hz is to show the amplification within a frequency range (0-10 Hz) that is

applicable for most structures. In obtaining the spectral ratios, standard

25-second windows were applied to velocity seismograms if the records were 25

seconds or longer; otherwise, the length of the shorter seismogram was used

for both records of the pair for which the spectral ratio is calculated, if

spectral ratios between pairs of stations are available, for more than one

event, the spectral ratios are superimposed to study the repeatability of the

relative response at that pair of sites. All spectral ratio plots are

smoothed with a triangular weighting function of 0.25 Hz width.

TOPOGRAPHICAL AMPLIFICATION AT CANAL BEAGLE

In Figures 1-3 the spectral ratios of three different events for stations

CBA/VAL are presented for vertical and horizontal (N-S and E-W) components,

57

respectively. These ratios are representative of only geological effects

(ignoring distances and source parameters of the three events) and therefore

represent the geological transfer function Tr

T ~

where AQ-^(CO) is the Fourier amplitude spectrum at site i.

The transfer function justifications have been discussed in detail by

Rogers and others (1984).

To provide a better comparison, the spectral ratios for stations CBA/VAL

of all three events are superimposed in Figure 4 for the vertical and horizon­

tal (N-S and E-W) , respectively. These summary figures display distinctive

resonance at approximately 6 to 7 Hz and amplification ratios ranging from l

to a minimum of 2 for frequencies 4 to 7 Hz in the N-S and E-W directions and

for frequencies 6-8 in the vertical direction.

The spectral ratios of the same three events (as in Figures 1-4) and

their superimposed comparative ratios for stations CBB/CBA are presented in

Figures 5 to 7 for the vertical and horizontal (N-S and E-W) components, res­

pectively. The same is repeated for stations CBC/CBA in Figures 8-10. Simi­

larly, spectral ratios from data available of only two events and their super­

imposed comparative ratios for stations CBE/CBA are presented in Figures 11 to

13 for vertical and horizontal (N-S and E-W) components, respectively. The

same is repeated for stations CBF/CBA in Figures 14-16. In the case of sta­

tion CBD sited on the top of the hill from which the ridges appear, the spec­

tral ratios show considerable variation. During the main event of March 3,

1985, there was no damage inflicted on the single and two-story buildings on

this hill, nor was there damage in the canyon where reference station CBA was

established. The spectral ratios from the data available of only two events

and their superimposed comparative ratios for stations CBD/CBA are presented

in Figures 17-19 for the vertical and horizontal (N-S and E-W) components,

respectively. For these two events, the spectral ratios do not indicate the

repeatability of frequency dependent amplifications of motions observed in

spectral ratios of other pairs of stations. Although some resonance (for both

events) is apparent around 8 Hz, until further observations can be made at the

pair of stations CBD and CBA, no credible amplification of motions at station

58

CBD as compared to motions at CBA can be claimed for frequencies between 0-10

Hz.

The significant amplification ratios are consistent and repeatable for

multiple events, particularly for N-S and E-W directions of stations CBB, CBC,

and CBF compared with station CBA. Therefore, it is concluded that with these

spectral ratios the ridge effects are separated as topographical transfer

function Tt :

T _ y ;>where A^ is the Fourier amplitude spectrun at site i.

Noting that stations CBB and CBC are on one ridge and station CBF is on an­

other, the spectral ratios displayed in Figures 6, 7, 9, 10, 15, and 16 for N-

S and E-W directions clearly indicate for different events resonance at fre­

quencies that are in the range of the structures built on the ridges. On the

other hand, the spectral ratio corresponding to station CBE (being at the

junction of the ridge and the hill) does not show similarities to the other

stations on the ridges.

GEOLOGICAL AMPLIFICATION AT VINA DEL MAR

Only selected spectral ratios are presented for most of the stations in

Vina. Data from some of the stations are not presented since the particular

events recorded at these stations do not provide a basis for comparison. In

obtaining the spectral ratios, the distance and topographical effects are

ignored as most of these stations are in close proximity to one another.

Therefore, only geological effects are assuned to be exhibited.

SPECTRAL RATIOS AT SAND SITES

Spectral ratio plots for two separate events each as well as superimposed

spectral ratios for stations EAC/VAL are presented in Figures 20-22 for the

vertical and horizontal (N-S and E-W) components, respectively. The same is

repeated for stations EAC/VAL (Figures 23-25) and for stations REN/VAL (Fig­

ures 26-28). Stations EAC (at Edificio Acapulco a severely damaged build-

59

ing), TRA (undamaged building, triangular shaped in plan, in close proximity

to Edificio Acapulco) and REN (on the hills of Reneca' and near Edificio El

Faro the structure which tilted during the main event and was dynamited

shortly after) were established to measure the amplification at the coastal

zone. These figures display the repeated and significant degree of amplifica­

tion at frequencies in the range of those structures (8-15 stories) where

these stations were sited.

SPBCTOAL RATIOS AT ALLUVIAL SITES

The only station on an alluvial site for which there is available data

for several events is station MUN. The data from stations (e.g., EMP and ELC)

on other alluvial sites exhibit very high spectral ratios as compared to sta­

tion VAL (rock site) because of the low amplitude and high frequency noise

mixed with the data from station VAL for the corresponding event. Therefore

the plots for the spectral ratios for stations MUN/VAL only corresponding to

two different events and their superimposed plots are presented in Figures 29-

31 for vertical and horizontal (N-S and E-W) components, respectively.

SPECTRAL RATIOS AT ROCK SITES

Spectral ratios from one event only for each one of the comparative sta­

tions QCL/VAL, HER/VAL and YNE/VAL, are provided in Figures 32-34, respective­

ly. Each figure depicts the spectral ratios of motions in vertical and hori­

zontal (N-S and E-W) components for the stations indicated.

CONCLUSIONS

The data set presented herein allow the following conclusions to be made:

o The data from Canal Beagle comprise essentially the first set of data

from a dense array deployed at a heavily populated region with ridges

and provides an opportunity to distinguish topographical effects from

others, and to correlate these effects with damage patterns,

o For several events, the seismograms obtained from different stations

and plotted with the same scale presented in Appendices A and B clear­

ly depict the degree of overall amplification of motions at various

stations as compared to the rock station or at any one station rela­

tive to any other station.

60

o It has been shown by use of the spectral ratios that there is signifi­

cant geological and topographical amplification at the ridges of Canal

Beagle as compared with the rock site (VAL).

o It has been shown that there is significant topographical amplifica­

tion at the ridges of Canal Beagle compared with the canyons of Canal

Beagle. The frequency dependent topographical amplification ratios of

motions at the ridges range from 1 to a minimum of 2 or 3 for most

frequencies in the ranges of structures built on them.

o The spectral ratios for different sites at Viria del Mar depict clearly

the frequency-dependent geological amplification at sand, alluvial,

and firmer sites (QCL, HER, YNE) as compared to the reference rock

station (VAL).

REOCMMETOATIONS FOR FUTURE 10RK

o Engineering application of these results should be derived and incor­

porated into local microzonation maps.

o Limited data has been obtained from alluvial sites in Vina del Mar.

In the future, additional data should be obtained at alluvial sites in

Vina del Mar.

o The work should be extended to Valparaiso where there is similar geo­

logical detail and damage correlation.

o The work presented herein should be further substantiated by theoreti­

cal studies involving wave propagation.

o In order to pursue the above, reliable soil layer stratification

information is necessary. This necessitates soil logs.

o Further work to quantify statistically engineering amplification fac­

tors is warranted. Mean spectral ratios will be obtained for those

stations where multiple-event data are available.

o Throughout this report only velocity seismograms have been used. The

acceleration seismograms are currently being studied to obtain res­

ponse spectra and Fourier spectral ratios and to compare these with

spectral ratios from velocity seismograms.

o Information on epicentral coordinates, magnitudes, and depths of the

aftershocks recorded in these experiments was not available during the

preparation of this report. This information is essential to pursue

further seismological studies. Further work to obtain epicentral dis-

61

tances from S-P times is currently in progress and these will be com­

pared with actual data of epicentral coordinates to be obtained from

the Geophysical Institute of the University of Chile.

REFERENCE

Rogers, A.M., Borcherdt, R.D., Covington, P.A., and Perkins, D.M., 1984, A

comparative ground response study near Los Angeles using recordings of Ne­

vada nuclear tests and the 1971 San Fernando earthquake: Bulletin,

Seismologieal Society of America, 74, No. 5, pp. 1925-1949.

62

100

10

EVENT 2100652 (JULY 29,1985) (VERT. Comp.)

CBA/VAL

4 6 HZ

10

EVENT 2101609 (JULY 29,1985) (VERT. Comp.)

CBA/VAL

4 6 HZ

100

1 -

EVENT 2111 208 (JULY 30,1 985) (VERT. Comp.)

CBA/VAL

4 6 HZ

Figure 1. Spectral ratios of three different events, respectively (vertical components) for stations CBA/VAL (Plots are log-linear for frequencies 0-10 Hz).

63

EVENT 2100652 (JULY 29,1985) (N-S Comp.)

CBA/VAL

4 6 HZ

100

EVENT 2101609 (JULY 29,1985) (N-S Comp.)

CBA/VAL

4 6 HZ

10

EVENT 2111 208 (JULY 30,1 985) (N-S Comp.)

CBA/VAL

0. 1

HZ

Figure 2. Spectral ratios of three different events, respectively (N-S com­ ponents) for stations CBA/VAL.

64

100

0. ]

EVENT 2 I 00652 (JULY 29, I 985) (E-W Comp.)

CBA/VAL

HZ

EVENT 2101609 (JULY 29,1985) (E-W Comp.)

CBA/VAL

HZ

EVENT 2111 208 (JULY 30,1 985) (E-W Comp.)

CBA/VAL

Figure 3. Spectral ratios of three different events, respectively (E-W com­ ponents) for stations CBA/VAL.

65

100

100

0.1

100

10

0.1

CBA/VAL

HZ

CE-W Comp.)

-I I L.

10

Figure 4. Superimposed spectral ratios of three different events for vertical and horizontal (N-S and E-W) components, respectively for stations CBA/VAL. '

66

EVENT 2 I 00652 (JULY 29,1 985) (VERT. Comp.)

CBB/CBA

EVENT 2101 609 (JULY 29, I 985) (VERT. Comp.)

CBB/CBA

EVENT 2111 208 (JULY 30,1 985) (VERT. Comp.)

CBB/CBA

Figure 5. Spectral ratios of three different events, respectively, and their superimposed plot (vertical components) for stations CBB/CBA. __

67

EVENT 2100652 (JULY 29,1985)

(N-S Comp.)

EVENT 2101609 (JULY 29,1985) (N-S Comp.)

CBB/CBA

EVENT 2111 208 (JULY 30,1 985) (N-S Comp.)

CBB/CBA

Figure 6. Spectral ratios of three different events, respectively, and their superimposed plot (N-S components) for stations CBB/CBA.

68

EVENT 2100652 (JULY 29,1985) CE-W Comp.)

EVENT 2101609 (JULY 29,1985) (E-W Comp.)

CBB/CBA

EVENT 2111 208 (JULY 30,1 985) (E-W Comp.)

CBB/CBA

Figure 7. Spectral ratios of three different events, respectively, and their superimposed plot (E-W components) for stations CBB/CBA.

69

EVENT 2 I 00652 (JULY 29,1 985) (VERT. Comp.)

CBC/CBA

EVENT 2101609 (JULY 29,1985)

EVENT 2111 208 (JULY 30,1 985) (VERT. Comp.)

CBC/CBA

Figure 8. Spectral ratios of three different events, respectively, and their superimposed plot (vertical components) for stations CBC/CBA.

70

iOOp-

EVENT 2100652 (JULY 29,1985)

(N-S Comp.)

CBC/CBA

EVENT 2101609 (JULY 29,1985) (N-S Comp.)

EVENT 2111 208 (JULY 30,1 985) (N-S Comp.)

CBC/CBA

Figure 9. Spectral ratios of three different events, respectively, and their superimposed plot (N-S components) for stations CBC/CBA.

71

EVENT 2 I 00652 (JULY 29, I 985) (E-W Comp.)

CBC/CBA

CBC/CBA

EVENT 2101609 (JULY 29,1985)

(E-W Comp.)

EVENT 2111208 (JULY 30,1 985)

Figure 10. Spectral ratios of two different events, respectively, and their superimposed plot (E-W components) for stations CRC/OBA.

72

100

10

0. 1

EVENT 2 I 00652 (JULY 29* I 985) (VERT. Comp.)

CBE/CBA

HZ

100

: EVENT 2 101 609 (JULY 29,1985) (VERT. Comp.)

10

0. 1

CBE/CBA

HZ

100

10

0. 1

10

10

CBE/CBA (Vert. Comp.)

10HZ

Figure 11. Spectral ratios of two different events, respectively, and their superimposed plot (vertical components) for stations CPE/CBA.

73

100 1 ' ' 1 I I , , I , , , I , r

EVENT 2 I 00652 (JULY 29, I 985) (N-S Comp.)

10

CBE/CBA

0.1

HZ

100 , | , , I | I , I | I I I | ! I

EVENT 2101609 (JULY 29,1985) (N-S Comp.)

10

10

0. 1

CBE/CBA

10HZ

100

10

0. 1

CBE/CBA

HZ

(N-S Comp.)

10

Figure 12. Spectral ratios of two different events, respectively, and their superimposed plot (N-S components) for stations CBE/CBA.

100

10

0.

EVENT 2100652 (JULY 29,1985) (E-W Comp.)

CBE/CBA

HZ

100

10

o.

EVENT 2101 609 (JULY 29, I 985) (E-W Comp.)

CBE/CBA

HZ

100

0. 1

10

10

10

Figure 13. Spectral ratios of two different events, respectively, and their superimposed plot (E-W components) for stations CBE/CBA.

75

100

10

0.1

EVENT 2 I 00652 (JULY 29,1 985) (VERT. Comp.)

CBF/CBA

HZ

100 i i i i i i i i i , i i , , i r

; EVENT 2101 609 (JULY 29, I 985) (VERT. Comp.)

o. iHZ

100

10

10

0. 110

Figure 14. Spectral ratios of two different events, respectively, and their superimposed plot (vertical components) for stations CBF/CBA.

76

100

10

o. i

EVENT 2100652 (JULY 29,1985) (N-S Comp.)

CBF/CBA

4 6 HZ

10

100

EVENT 2101609 (JULY 29,1985) (N-S Comp.)

CBF/CBA

lOOr

HZ10

10

Figure 15. Spectral ratios of two different events, respectively, and their superimposed plot (N-S components) for stations CBF/CBA.

77

100

10

0. 1

EVENT 2 I 00652 (JULY 29,1 985) (E-W Comp.)

4 6 HZ

ID

100

EVENT 2101 609 (JULY 29 f I 985) (E-W Comp.)

10r

CBF/CBA

0.14 6

HZ10

100

0. 1

Figure 16. Spectral ratios of two different events, respectively, and their superimposed plot (E-W components) for stations CBF/CBA.

78

100r

; EVENT 2110933 (JULY 30,1985)

CBD/CBA

10

0. I 1

(Vert. Comp.)

HZ10

lOOr

0. 1

EVENT 2111 208 (JULY 30,1 985)

100 F

0. 1

Figure 17. Spectral ratios of two different events, respectively, and their superimposed plot (vertical components) for stations CBD/CBA.

79

100

lOr

1 -

0. 1

EVENT 2110933 (JULY 30,1985)

CBD/CBA

(N-S Comp.) I

10HZ

100

EVENT 2111 208 (JULY 30,1 985) (N-S Comp.)

CBD/CBA

0.1'10

HZ

100

Figure 18. Spectral ratios of two different events, respectively, and their superimposed plot (N-S components) for stations CBD/CBA.

80

lOOr

0. 1

T i I r~

EVENT 2110933 (JULY 30,1985)

CBD/CBA

100

10

EVENT 2111 208 (JULY 30,1 985) <E-W Comp.)

CBD/CBA

0. 14 6

HZ10

lOOr

0. 1

Figure 19. Spectral ratios of two different events, respectively, and their superimposed plot (E-W components) for stations CBD/CBA.

81

100

10

0. 1

EAC/VAL

EVENT 2 I 50204 (AUGUST 3,1 985)

(Vert. Comp.)

HZ10

100

0. 1

EVENT 2161857 (AUGUST 4,1 985)

100

0. 110

Figure 20. Spectral ratios of two different events, respectively, and their superimposed plot (vertical components) for stations EAC/VAL.

82

100

: EAC/VAL

ID

0.1

EVENT 2 I 50204 (AUGUST 3,1 985)

(N-S Comp.)

HZ10

100

EAC/VAL EVENT 2161 857 (AUGUST 4,1 985)

(N-S Comp.)

100

0. 1

Figure 21. Spectral ratios of two different events, respectively, and their superimposed plot (N-S components) for stations EAC/VAL.

83

lOOr

EVENT 2 I 50204 (AUGUST 3,1 985)

(E-W Comp.)

10

100

10

0. 1

EAC/VAL EVENT 2 1.6 I 857 (AUGUST 4,1 985)

(E-W Comp.)

HZ10

10

Figure 22. Spectral ratios of two different events, respectively, and their superimposed plot (E-W components) for stations EAC/VAL.

84

lOOr

10

TRA/VAL

EVENT 2161857 (AUGUST 4,1 985)

(Vert. Comp.)

10HZ

100

10-

0. 1

EVENT 2191 002 (AUGUST 7,1 985)

10

100

10

Figure 23. Spectral ratios of two different events, respectively, and their superimposed plot (vertical components) for stations TRA/VAL.

85

100

10

TRA/VAL EVENT 2161 857 (AUGUST 4,1 985)

(N-S Comp.)

10HZ

iOOr

TRA/VAL EVENT 2191 002 (AUGUST 7,1 985)

(N-S Comp.)

100

0. 110

Figure 24. Spectral ratios of two different events, respectively, and their superimposed plot (N-S components) for stations TRA/VAL.

86

lOO

10

0.1

TRA/VAL

100

10r

0. 1

100

0.1

EVENT 2161 857 (AUGUST 4,1 985)

(E-W Comp.)

HZ

EVENT 2191002 (AUGUST 7,1 985)

(E-W Comp.)

HZ

(E-W Comp.)

HZ

10

10

10

Figure 25. Spectral ratios of two different events, respectively, and their superimposed plot (E-W components) for stations TRA/VAL.

87

100

10 r

0. 1

REN/VAL

EVENT 2 I 50204 (AUGUST 3,1 985)

(Vert. Comp.)

100

HZ10

10

0. 1

REN/VAL

EVENT 2 16 I 857 (AUGUST 4,1 985)

(Vert. Comp.)

HZ10

100

0. 110

Figure 26. Spectral ratios of two different events, respectively, and their superimposed plot (vertical components) for stations REN/VAL.

88

100

10

0. 1

REN/VAL

100

10-

0. 1

REN/VAL

100

0. 1

EVENT 2 I 50204 (AUGUST 3,1 985)

(N-S Comp.)

HZ

EVENT 2161 857 (AUGUST 4,1 985)

HZ

10

10

Figure 27. Spectral ratios of two different events, respectively, and their superimposed plot (N-S components) for stations PEN/VAL.

89

100

0.1

EVENT 2 I 50204 (AUGUST 3.1 985)

(E-W Comp.)

4 6 HZ

10

100

10

0. 1

REN/VAL

100

0. 1

EVENT 2161 857 (AUGUST 4,1 985)

(E-W Comp.)

HZ10

Figure 28. Spectral ratios of two different events, respectively, and their superimposed plot (E-W components) for stations REN/VAL.

90

100

lOr

0.1

MUN/VAL

EVENT 2161857 (AUGUST 4,1 985)

(Vert. Comp.)

4 6 HZ

10

100

0. 1

EVENT 2191 002 (AUGUST 7,1 985)

100

0. 1

Figure 29. Spectral ratios of two different events, respectively, and their superimposed plot (vertical components) for stations MUN/VAL.

91

100

10

0. 1

MUN/VAL

lOOr

10

0. 1

MUN/VAL

100

10

0.

MUN/VAL

EVENT 2161 857 (AUGUST 4, I 985)

(N-S Comp.)

10HZ

EVENT 2191002 (AUGUST 7 t I 985)

(N-S Comp.)

10HZ

(N-S Comp.)

10HZ

Figure 30. Spectral ratios of two different events, respectively, and their superimposed plot (N-S components) for stations MUN/VAL.

92

100

10

0. 1

MUN/VAL

100

10

0. 1

MUN/VAL

100

10

0. 1

MUN/VAL

i ' i ' ' ' i ' ' "~

EVENT 2161 857 (AUGUST 4,1 985)

(E-W Comp.)

10HZ

EVENT 2191 002 (AUGUST 7 f I 985)

(E-W Comp.)

10HZ

(E-W Comp.)

10HZ

Figure 31. Spectral ratios of two different events, respectively, and their superimposed plot (E-W components) for stations MUN/VAL.

93

100 I I I I I I I I I I I

EVENT 2 I 50204 (AUGUST 3,1 985) (Vert. Comp.)

0. 1

HZ

100

10

0. 1

EVENT 2 I 50204 (AUGUST 3,1 985) (N-S Comp.)

QCL/VAL

HZ

lOOf

EVENT 2 I 50204 (AUGUST 3,1 985) (E-W Comp.)

10

10

Figure 32. Spectral ratios of one event for vertical and horizontal (N-S and E-W) components, respectively, for stations QCL/VAL.

94

100

10

EVENT 2 I 50204 (AUGUST 3 t I 985) (Vert. Comp.)

HER/VAL

4 6 HZ

10

100

10

0. 1

i i i i i i i i i i I I

EVENT 2 I 50204 (AUGUST 3 t I 985)

HER/VAL

HZ

100

10

0. 1

EVENT 2 I 50204 (AUGUST 3 t I 985)

HER/VAL

...

HZ

(N-S Comp.)

I ...

10

(E-W Comp.)

10

Figure 33. Spectral ratios of one event for vertical and horizontal (N-S and E-W) components, respectively, for stations HER/VAL.

95

100

10

0. 1

EVENT 2 I 50204 (AUGUST 3,1 985)

YNE/VAL

HZ

100

10

0. 1

YNE/VAL

HZ

100

lOr

1 *

0. 1

EVENT 2 I 50204 (AUGUST 3,1 985)

YNE/VAL

4 6 HZ

(Vert. Comp.)

10

EVENT 2 I 50204 (AUGUST 3,1 985) (N-S Comp.)

10

(E-W Comp.)

10

Figure 34. Spectral ratios of one event for vertical and horizontal (N-S and _ E-W) components, respectively, for stations YNE/VAL.

96

APPENDIX ACANAL BEAGLE EXPERIMENT

SEISMOGRAMS, POORIER AMPLITUDE SPECTRA, AND SPECTRAL RATIOS

The objective of this appendix is to provide in a compact format the

seismograms, Fourier amplitude spectra and spectral ratios related to Canal

Beagle experiment only. Selected plots of data processed by C. Mueller and J.

Watson are presented herein.

The plots are organized as follows:

Event Type of Plot Figure(s)

2100652

2101609

2110933

2111208

SeismogramsFourier amplitude spectraSpectral ratios

SeismogramsFourier amplitude spectraSpectral ratios

SeismogramsFourier amplitude spectraSpectral ratios

SeismogramsFourier Amplitude SpectraSpectral Ratios

A1-A3 A4-A9 A10-18

A19-A21 A22-A27 A28-A36

A37-A39 A40-A45 A46-A50

A51-A53 A54-A60 A61-A70

A

RSGRF:22-OCT-85. PLOT DECIMflTED BT:2

^MMf^ ^ 210065234.VfiL UP. 0.0

2l00652S«.CBfl UP, 0.0

0.10

0.08

0.06

O.oy

0.02

210065254.CBB UP, 0.0

2100652S4.CBC UP, 0.0

]<$( 2100652S4.CBE UP, 0.0

2100652S4.CBF UP. 0.0

10 20 SECS

30

Figure Al. Scaled seignograms for event 2100652S (vertical components)

A-l

RSGRF:22-OCT-85. PLOT DECIMflTED BT:2

0.10 r

0.08 -

0.06 -

enze_»

0.04

0.02 -

^

10 20 -SECS

-2100652S5.VflL H*0, 0.0

2100652S5.CBfl H=0, 0.0

2100652S5.CBB H=0, 0.0

2100652S5.CBC H=0, 0.0

f\ 2100652S5.CBE H=0. 0.0

2100652S5.CBF H=0, 0.0

30

Figure A2. Scaled seismograms for event 2100652S (N-S components)

A-2

flSGRF:28-OCT-85. PLOT DECIMRTED BYs2

0.20 r

0.15

0.10

0.05

210065256.VflL H-90. -2.30

210065256.CBfl H=90. -2.30

2100652S6.CBB H=90, -2.30

2100652S6.CBC H=90, -2.30

2100652S6.CBE H=90, -2.30

Note: Because of a timing "glitch" at2.2 seconds, of station CBE records, plots were corrected by skipping into the trace by 2.3 seconds.

JJ21D0652S6.CBF H=90. -2.30

11

105ECS

20 30

Figure A3. Scaled seismograms for event 2100652S (E-W components).

A-3

c.ow

0.00?

Figure A4. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 06:52 for the vertical, horizontal (N-S and E-W) components, respectively, for station VAL.

A-4

ISSJ56.CBH B,OT

Figure A5. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 06:52 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBA.

A-5

2iooes?ss cm i

Figure A6. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 06:52 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBB.

A-6

J100S5M5.CBC »*0

Figure A7. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 06:52 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBC.

A-7

Figure A8. Time series and Fourier amplitude spectra of event on July 29 1985 (Julian 210) at 06:52 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBE.

A-8

Figure A9. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 06:52 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBF.

A-9

2100652SU.CBR V

OPS=RDC

2100652S5.CBR H=0

OPS=

flDC

2100652S6.CBR H=

90

OPS=

flDC

0.01

-0.01

1510

2t0

06

52

Sii.

VflL

V

OP

S=R

DC

SECS

2100652S5.VRL H=0

OPS=ROC

SECS

0.00

4 r

15

0.01

0

-0.01

10

2100652S6.VRL H=9D

OPS=

ftDC

SECS

0.005

-/

-0.005 -

15

IDOr

0.1

100 10

0. 1

too

1020

HZ

10

300. 1

1020

HZ30

Figu

re A1

0. S

caled

seismograms

and

spec

tral

ra

tios

of

even

t on

July

29,

1985

(Julian

210) at

06:52 for

the

vertical,

horizontal (N

-S a

nd E

-W)

components,

resp

ecti

vely

, for

station

CBA/VAL.

2100652SU.CBB V

OPS=RDC

2100652S5.CBB H=0

OPS=

PDC

2100652S6.CBB H=

90

OPS=PDC

0.02

r 2100652S

U.V

RL

V O

PS=F

1DC

2100652S5.VPL H=0

ops=

noc

O.O

OU

r

21

00

65

2S

6.V

PL

H

=90

OPS

=F1D

C

0.0

05

-/

-0.0

05

-

lOO

i i

i ,

, i

i i

, i

10

[ I I I U

J I 1

J

I I I I L

_I 1

1

_J

I I I I 1

_J

I

i -l-

0 10

20

H

Z

100

30

100

30

ID

0.

I10

20

HZ

30

Figu

re Al

l. S

cale

d seismograms

and

spec

tral

ra

tios

of

event

on J

uly

29,

1985

(Julian

210)

at

06:52 for

the

vertical,

horizontal (N-S a

nd E

-W)

comp

onen

ts,

resp

ecti

vely

, for

station

CBR/

VAL.

2100

652S

U.CB

C V

OPS=flOC

2100652S5.CBC

H=0

OPS=flDC

2100652S6.CBC

H=90

OPS=flDC

0.02

-0.0

2

2100

6523

4.Vf

lL V

OPS=

nDC

10

SE

CS

15

I I »

r\D

0.0

01

4

0.0

02 0

-0.0

02

-0.0

01 100 I0r

0. 1

10

SE

CS

15

1020

HZ

O.O

U

0.0

2 0

-0.0

2

-O.O

li

20

2l00

652S

5.Vf

lL H=0

OPS=

ROC

10

SECS

15

20

O.O

Oil

0.0

02 0

-0.0

02

-O.O

Oil

C

100 10

300. I

10

SECS

15

1020

HZ

20-0.05

2100652S6.VRL

H=90

OPS=

RDC

10

SECS

15

0.00

5 -/

20

-0.005 -

100

300. L

20

Figure A1

2. S

caled

seis

mogr

ams

and

spec

tral

ra

tios

of

event

on J

uly

29,

1985 (J

ulia

n 210) at

06:

52 for

the

vert

ical

, horizontal (N-S a

nd F

-W)

components,

resp

ecti

vely

, for

station

CBC/

VAL.

2100

652S

U.CB

E V

OPS=

RDC

2100

652S

5.CB

E H=0

OPS=

RDC

0.01

0

-0.0

1

-0.0

2

0.01

0

-o.o

i

210065254.VRL V

ops=

noc

10

SECS

1520

2100652S5.VRL

H=0

OPS=

flDC

10

SE

CS

O.O

Oii

i-

1520

2100

652S

6.CB

E H=90

OPS=

RDC

TIME

i 0

= 3.00

0.02

0.01

-O.Ol

2100652S6.VflL H=90

OPS=flDC

TIME:

0 =

3.00

10

SECS

0.00

5

-0.0

05

15

\ \

20

lOOl

I ,,,,!!,

I

10

0. t

1020

HZ30

100 10

0.1

to20

HZ30

100 10

0. I

i I

i i

I I

I 1_J I

1020

HZ30

Figu

re A1

3. Sc

aled

seismograms

and

spec

tral

ra

tios

of

event

on J

uly

29,

1985 (Julian

210)

at 0

6:52 fo

r th

e ve

rtic

al,

horizontal (N

-S an

d E-

W) components,

respectively,

for

station

CPE/VAL.

2100B52SU.CBF

Vops=noc

2100

652S

5.CB

F H=

0 OP

S=fl

DC2100652S6.CBF

H=90

OPS=

RDC

2100

652S

I1.V

RL

VOP

S=fl

DC2100652S5.VRL H=0

OPS=

flDC

0.00

11F

/

10

SEC

S15

20

2100652S6.VRL H=

90OPS=RDC

10

SECS

0.00

5

-0.005

-

15

10

SECS

15

20 20

100 10

0. 1

1020

HZ

30

100

0. I

0. I

Figure A14. S

cale

d seismograms

and

spectral ratios of

ev

ent

on J

uly

29,

1985 (J

ulia

n 21

0) at

06:

52 for

the

vertical,

horizontal (N-S a

nd F

r-W) co

mpon

ents

, re

spec

tive

ly,

for

station

CBF/VAL.

2100652SU.CBB V

OPS=

flDC

2100652S5.CBB H=0

OPS=

flDC

2100652S6.CBB H=90

OPS=

flDC

I H-»

cn

2100

652S

U.CB

FI V

OPS=

flDC

0.01

5

0.010

0.005 0

-0.005

-0.010 10

0 10

10SECS

0.02 -

-0.02

- 2100652S5.CBF) H=0

OPS=

flDC

2100652S6.CBR H=90

OPS=

flDC

15

100

O.I

1 . ..' .

I .......

i .

I .........

0 10

20

30

10SECS

SECS

too 10

0. 1

1020

HZ

15

30

Figu

re A15.

Sc

aled

seismograms

and

spec

tral

ra

tios

of

event

on J

uly

29,

1985 (Julian

210)

at

06:52

for

the

vert

ical

, ho

rizo

ntal

(N

-S an

d E-W) co

mpon

ents

, re

spec

tive

ly,

for

stat

ion

CBB/CBA.

2L00

652S

U.CB

C V

OPS=

RDC

210065235.CBC

H=0

OPS=

RDC

2100

6523

6,CB

C H=

90

OPS=

RDC

0.02

-0.02

2100652SU.CBR

V OP

S=RD

C

10

SEC

S15

0.0

15

r-

100 ID

SEC

S

1020

HZ

O.O

li

0.0

2 0

-0.0

2

-O.O

li

20

2100652S5.CBR

H=0

OPS=

RDC

10

SECS

15

15

O.OL

-0.01 lOOr

300. t

10SECS

0.05

20-0

.05 .

2100

652S

6.CB

R H=90

OPS=

RDC

10

SECS

0.01

15

100 10

0. 1

10

10SECS

15

20HZ

20

15

30

Figu

re A1

6. S

caled

seis

mogr

ams

and

spectral ratios of ev

ent

on J

uly

29,

1985

(Julian

210)

at 0

6:52

for

the

vertical,

hori

zont

al (N-S a

nd E

-W)

comp

onen

ts,

resp

ecti

vely

, for

station

CBC/

CBA.

2100652SU.CBE V

OPS=RDC

2100652S5.CBE H=0

OPS=RDC

2100652S6.CBE H=90

OPS=RDC

TIME:

0 =

3,00

210D652SU.CBR V

OPS=RDC

0.015

0.010

0.005 0

-0.005

-0.010

1015

2l00

652S

5.CB

fl H=0

OPS=RDC

0.01

0

-0.01

J|t^^

10

\

15

2100652S6.CBR H=90

OPS=RDC

TIME:

0 =

3.00

-0.01

r

10SE

CSSE

CSSE

CS

100 lOr

0.1

1020

HZ30

100

0. 1

30

lOr 1 -

0. 1

1020

HZ30

Figure A1

7. S

caled

seis

inog

rams

an

d sp

ectr

al ra

tios

of

ev

ent

on J

uly

29,

1985

(Julian

210)

at 0

6:52

for

the

vertical,

horizontal (N-S a

nd E

-W)

comp

onen

ts,

resp

ecti

vely

, for

station

CBE/

CBA.

2100652SU.CBF V

OPS=

flDC

2100652S5.CBF H=0

OPS=

fiDC

2100652S6.CBF H=90

OPS=

flDC

0.02

0.01

0

-0.01

-0.0

2

2100652S4.CBR V

GPS=

flDC

0.0

15

0.0

10

0.0

05 0

-0.0

05

-0.0

10

10

SEC

S15

20

1015

0.0

4

0.0

2 0

-0.0

2

-0.0

4

F/

2100652S5.CBR H=0

OPS=

flDC

10

SECS

0.01

10

1520

15

0.04

0.02

0

-0.02

-0.0

4

2100652S6.CBR H=

90

OPS=

flDC

10

SECS

0.01

15

10

20

15SE

CSSE

CSSE

CS

lOOi

i i

i i

i i

i i

i

10 r

O.I

1020

HZ

100

300. I

100 ID

0. I

ID20

HZ30

Figu

re A

18.

Scaled se

ismo

gram

s an

d sp

ectr

al ra

tios

of

even

t on

July

29,

1985

(Julian

210)

at 0

6:52

for

the

vertical,

horizontal (N-S a

nd E

-W)

comp

onen

ts,

respectively,

for

stat

ion

CBF/

CBA.

RSGRF:22-OCT-85. PLOT DECIMfiTED BT:2

0.3 r

0.2 -

0.1

0 L

2101609N4.VRL UP, 0.0

2101609NIJ.CBR UP. 0.0

^wMMr***^^ up. o.o

^ 2101609N4.CBC UP. 0.0

bW^^f^M^i^ UP. o.o

fj^l^^2101609N4.CBF UP, 0.0

10 20SECS

30

Figure A19. Scaled seismograms for event 2101609 (vertical components).

A-19

L :

fiSGRF:22-OCT-85. PLOT DECIMflTED BT:2

O.U

0.3

0.2

0.1

0 L

2101609N5.VRL H=0, 0.0

*2101609N5.CBR H=0, 0.0

2101609N5.CBB H-0, 0.0

2101609N5.CBC H=0, 0.0

'f^ljfjjf^^ 2101609N5.CBE H=0, 0.0

2101609N5.CBF H=0, 0.0

10 20 SECS

30

Figure A20. Scaled seismograms for event 2101609 (N-S components)

A-20

fiSGRF:22-OCT-85. PLOT DECIMRTED BY:2

0.8 -

0.6 -

o.y -

0.2 -

2101609N6.VRL H=90, 0.0

2101609N6.CBR H=90, 0.0

*2101609N6.CBB H=90, 0.0

0 L

H=90, 0.0

2101609N6.CBE H=90, 0.0

10 20 SECS

2101609N6.CBF H=90, 0.0

30

Figure A21. Scaled seisnograms for event 2101609 (E-W components)

A-21

^tJ^l1lj4^t^*v*^^

/J|i, |^|\jY^Vi/ryYv*'^M"^^

f||^

Figure A22. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 16:09 for the vertical, horizontal (N-S and E-W) components, respectively, for station VAL.

A-22

IH

Figure A23. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 16:09 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBA.

JIOI6CIW6.C88 M.90

J|^^

II

Figure A24. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 16:09 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBB.

A-24

JI01609H6.CBC "

f|i^^4^

Figure A25. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 16:09 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBC.

A-25

iioiecw

Figure A26. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 16:09 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBK.

Jim BOWS, cer

Figure A27. Time series and Fourier amplitude spectra of event on July 29, 1985 (Julian 210) at 16:09 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBF.

A-27

2lOl

609N

U.CB

fl V

OPS=flDC

2101609N5.CBH

H=0

OPS=flDC

21D1

609N

6.CB

R H=9Q

GPS=flDC

2101609NU.VRL V

OPS=RDC

01

0 ot 0210

SECS

1520

2lOl

609N

5.Vf

lL H=0

OPS=

RDC

0.0

2

0.01

0

-0.0

1

-0.0

2

_/ -

\

Illll

tyty

ty^

10

SEC

S15

20

2101609N

6.V

FIL

H

=90

OPS

=P)D

C

0.0

3

0.0

2

0.01

0

-0.0

1

-0.0

210

SE

CS

1520

100 10

0. t

1020

HZ

lOO

tr

300.

1

100 ID

0. I

1020

HZ

30

Figu

re A2

8. S

caled

seis

mogr

ams

and

spectral ra

tios

of

ev

ent

on J

uly

29,

1985 (Julian

210) at

16

:09

for

the

vert

ical

and

horizontal (N

-S a

nd E

-W)

components,

respectively,

for

stations C

BA/V

AL.

2101

609N

U.CB

B V

OPS=

flDC

2101

609N

5.CB

B H=0

OPS=

flDC

2101609N6.CBB

H=90

OPS=flOC

2lO

l609N

li.V

flL

V O

PS

=flO

C2lOl609N5.VflL H=0

OPS=

flDC

0. 1

-O.I r 210l

609N

6.Vf

lL H=

90

OPS=flDC

'

0.0

2

0.0

1 0

-0.0

1

_n

no

\/

r jL : i

i i

i 1

i

,

\

iJJjk

.^y^,,.^

^^^

-WiM

lt

fP

, 1

, ,

, ,

1 .

. .

. 1

10

SECS

1520

100

0.1

1020

HZ

100

30

10

0. 1

1020

HZ

lOOr

30

Figu

re A2

9. S

caled

seisnograms

and

spec

tral

ratios of

event

on J

uly

29,

1985

(J

ulia

n 210) at

16:09

for

the

vertical and

horizontal (N-S a

nd F

-W)

comp

onen

ts,

respectively,

for

stations C

BB/V

AL.

(O ^ £ o

0.05

0

-0.05

-0.10

-0.15

02101

609N

U.CB

C V

3PS=

flDC

h^w**^^

: . i .

. i . .

.1 . i ,

i , 1 1

, 1. 1 ,

i5

10

15

20

SECS

2101

609N

4.VR

L V

DPS=flDC

210I609N5.CBC

H=0

OPS=

RDC

2101

609N

6.CB

C H=

90

GPS=flDC

-0.1

- 2lO

l60

9N

5.V

flL

H

=0

OP

S=f

lDC

2101609N

6.V

RL

H=9

0 O

PS

=flD

C

0.0

1 0

-0.0

1

-0.0

2Ci

, ,

. ,

i ,,,,,,,.,,,,,,,

-°-0

25

10

15

20

C SE

CS

/ -

^^^^

^t

_, L

.j^

"

"'' '' ''

5

X^

u.u

d

0.0

2

y( 1

<" o.

o i

i^p^^yvw

^w

r

i.

-0.0

1

1 '

' '

' '

'

' '

'

-0.0

210

15

20

C SE

CS

\/

I [

1

5

\

1 i fl[l4

l,^llli.iktlii«

WU

l.M

.4U

iin>

'-- -.

"...

jjiftttjW

^^

, 1

1 .

. !

1 .

. .

. I

10

15

20

SEC

S

100 lO

r

0.

I

100 10

0. I

1020

HZ

100

30

10 r

0. I

Figu

re A30. S

cale

d se

ismo

gram

s and

spec

tral

ratios of

ev

ent

on J

uly

29,

1985

(Julian

210) at

16:09

for

the

vertical and

horizontal (N

-S a

nd E

-W)

comp

onen

ts,

respectively,

for

stations C

PC/VAL.

2101609N

U.C

BE

V

OP

S=f

lDC

0.01

4

0.0

2 0

-0.0

2

-O.O

U

210l609Nli.VfiL

V OP

S=fl

DC

10

SECS

O.Dl 0

-0.01

-0.02

10

SECS

1520

1520

2101609N5.CBE H=0

OPS=

flDC

-0.02

-

-0.04

- 2101609N5.VRL H=0

OPS=

flDC

0.02

0.01

0

-0.01

-0.02

VKfHf***********

1

10

SECS

1520

2101609N6.CBE H=90

OPS=

flDC

TIME:

0 =

2.50

0.05 -

-0.0

5 - 2101609N6.VRL H=90

OPS=

flDC

TIME

s 0

= 2.50

0.03 r

100 10

1020

HZ

100

30

100 10

0. 1

20HZ

30

Figu

re A3

1. Scaled seis

mogr

ams

and

spectral ratios of event

on J

uly

29,

1985

(Julian

210)

at

16

-09

for

the

vertical and

hori

zont

al (N-S a

nd E

-W)

components,

respectively,

for

stations C

PK/V

AL.

2101609NU.CBF V

OPS=

flDC

2L01609N5.CBF H=0

OPS=

flDC

2101609N6.CBF H=90

OPS=

flDC

oo

ro

O.OU

0.02

0

-0.0

2

-0.04

2101609NU.VOL.

V

OPS=

F)DC

10

SECS

-0.0

2

20

0.05

-0.05

- 2101609N5.VRL H=0

OPS=

flDC

0.0

2

0.0

1 0

-0.0

1

-0.0

2

_/

\

fr

iM****'*

*""

' *'^

|||j|ft|^

L 1

E ,

, i

, 1

. ,

, ,

1 L

i i

, 1

i .

i i

1

10

SECS

1520

2101609N6.VRL H=90

OPS=

F)DC

0.03

E-

tOOr

10

0. 1

1020

HZ

100

300. 1

lOO

30

0. 1

Figu

re A32. S

cale

d se

ismo

gram

s and

spec

tral

ra

tios

of ev

ent

on J

uly

29,

1985 (Julian

210) at 16

:09

for

the

vertical and

horizontal (N-S a

nd E

-W)

components,

respectively,

for

stations C

BF/V

AL.

2101609NU.CBB V

OPS=RDC

2101609N5.CBB H=0

OPS=

flDC

2101609N6.CBB H=90

OPS=

ROC

21D1609N4.CBR V

OPS=RDC

2101609N5.CBR H=0

OPS=

flDC

O.I 0

-0.

1

2101609N6.CBR H=

90

OPS=RDC

10

SECS

0. 1

5

0. 1

0

0.05

0

-0.05

10

SECS

\

1520

"\

<rff

Nw

1520

100r

r-r-

T

10

0,1

1020

HZ30

100 lOr

1 -

0. I

1020

HZ30

LOO 10

0. I

1020

HZ30

Figu

re A3

3. S

cale

d^ sei

gnog

rams

and

spectral ra

tios

of

even

t on

July

29,

1985 (Julian

210) at 16

:09

for

the

vertical and

horizontal (N-S a

nd E

-W)

comp

onen

ts,

respectively,

for

stat

ions

CBB

/CBA

.

2lO

t60

9N

li.C

BC

V

GP

S=f

iDC

2101609N5.CBC

H=0

GPS=

RDC

2101609N6.CBC

H=90

OPS=

RDC

2l0

16

09

NU

.CB

fl V

OPS

= F

IDC

-o.t

- 2101

609N

5.CB

R H=0

OPS=

nDC

0.01

4 I-

2101

609N

6.CB

fl H=90

OPS=

nDC

0. 15

0. 1

0

0.05

0

-0.0

5

10

SECS

15

\

20

100

0. t

100

30

lOr

0. 1

1020

HZ

100

30

10

0. I

1020

HZ30

Figu

re A3

4. S

caled

seis

nogr

ams

and

spectral ra

tios

of

even

t on

July

29,

1985

(Julian

210)

at 16-09

for

the

vertical and

horizontal (N-S a

nd E

-W)

comp

onen

ts,

resp

ecti

velv

. for

stations

2101

609N

I1.C

BE

V

OPS

=RD

C2101609N5.CBE H=0

OPS=

ROC

21

0t6

09

Nii.

CB

fl V

OPS

=RD

C2101609N5.CBR H=0

OPS=RDC

2101609N6.CBE H=90

OPS=

RDC

TIME

s 0

= 2.

50

0.05

-

-0.0

5 - 2101609N6.CBR H=90

OPS^RDC

TIME

s 0

= 2.

50

100 10

0. 1

1020

HZ30

100 10

I r

0. 1

1020

HZ30

100 10

0. I

1020

HZ30

Figu

re A3

5. Scaled se

ismo

gram

s and

spec

tral

ratios of ev

ent

on J

uly

29,

1985

(Julian

910)

at 16:09

for

the

vertical and

horizontal

(N-vS and

E-W) co

mpon

ents

, re

spec

tive

ly,

for

stations C

BE/C

BA.

2101609NU.CBF V

OPS=PDC

2101609N5.CBF H=0

OPS=

flDC

-0 -0

0.05

-0.05

-

2101609NU.CBP V

OPS=

fiDC

10

SECS

1520

2101609N5.C8R H=0

OPS=

flDC

210I609N6.CBF H=90

OPS=

fiDC

210I609N6.CBP H=

90

OPS=

fiDC

\

4^^^

10 SECS

1520

100r

-r100

0.1

30

10

0. 1

1020

HZ30

Figure A3

6. S

cale

d seis

mogr

ams

and

spec

tral

ra

tios

of

even

t on

July

29,

1985

(J

ulia

n 21

0) at 16:09

for

the

vertical and

horizontal

(N-v

S and

E-W)

co

mpon

ents

, respectively,

for

stations C

BF/CBA.

fiSGRF:22-OCT-85. PLOT DECIMflTED BY:2

0.4

CT,

d>to

d>-Q

4->rs o

dj

dj

0.3

0.2

0.1

O

to+->c dJcO dJ CL > E fO O 5 O I

CO

21l0933SU.VflL UP, 0.0

2110933SU.MUN UP. 0.0

1093354.CBB UP, 0.0

2\ 10933SU.CBC UP. 0.0

nfl^^ 2110933SU.CBD UF. 0.0

f^M^^^ 2110933S4.CBE UP. 0.0

10 SECS

15 20

Figure A37. Scaled seismograms for event 2110933 (vertical components).

A-37

RSGRF:22-OCT-85. PLOT DECIMflTED BY:2

21l0933S5.VflL H=0. 0.0

2110933S5.MUN H=0, 0.0

0.6

0.4

0.2

0 L

^ ^jljl^^^ 10933S5.CBB H-0, 0.0

H=0 -

2110933S5.CBD H»0. 0.0

^JfJ^[^^ 10933S5.CBE H=0. 0.0

10SECS

15 20

Figure A38. Scaled seisinograms for event 2110933 (N-S components).

ftSGRF:22-OCT-85. PLOT DECIMflTED BT:2

2110933S6.VflL H=90, 0.0

2110933S6.MUN H=90, 0.0

fjtytfWtyWIu^ H=90, 0.0

0.8

0.6

toV.z o

0.2

0 L

2110933S6.CBC H=90, 0.0

Ifr^jl/lM^ H=9 °*

*jfiJftlllfl/\M*hhl^^ »^wArV«^ ^-*^r 2110933S6.CBE H=90. 0.0

ID SECS

15 20

Figure A39. Scaled seismograms for event 2110933 (E-W components)

A-39

Figure A40. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 09:33 for the vertical, horizontal (N-S and E-W) components, respectively, for stations VAL.

A-40

i!09335S "UN M.90

Figure A41. Time series and Fourier amplitude spectra of event on July 30 1985 (Julian 211) at 09:33 for the vertical, horizontal (N-S and E-W) components, respectively, for stations MUN.

Figure A42. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 09:33 for the vertical, horizontal (N-S and E-W) components, respectively, for stations CBB.

A-42

JIIOS33S1.CBC

^ ^

>|||taMfyWM*'VwVW'*»v*»^ *^

Figure A43. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 09:33 for the vertical, horizontal (N-S and E-W) components, respectively, for stations CBC.

._.. ______

^ ~

^\jbJ{}\l\J\J\tyW*^^ -

Figure A44. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 09:33 for the vertical, horizontal (N-S and E-W) components, respectively, for stations CBD.

|fj||||||fjfl^^

?II093356.C»E K-90

tyt^4iVv^^

Figure A45. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 09:33 for the vertical, horizontal (N-S and E-W) components, respectively, for stations CBE.

A-45

2U

0933S

U.M

UN

V

OPS

=RD

C2

U0

93

3S

5.M

UN

H

=0

OP

S=f

lDC

2110933S6.MUN

H=90

OPS=flDC

2110933S

li.V

flL

V O

PS=R

DC

02 01

-0.0

1

10

SEC

S

0.0

5

-

-0.0

5

-

0.0

5 r

-0.0

5

-

2ll0

93

3S

5.V

flL

H

=0

OPS

=RD

C

\

fa

WV

WW

tA.

O

1520

2U

09

33

S6

.VR

L

H=9

0 O

PS

=fiD

C

100

0.1

100 10

0.

I10

20H

Z

100

30

10

0.

110

20H

Z30

Figu

re A46. S

caled

seis

mogr

ams

and

spectral ratios of event

on J

uly

30,

1985 (Julian

211)

at

09-33 for

the

vertical,

horizontal (N

-S a

nd E

-W)

components,

respectively,

of stations M

IJN/VAL.

0.0

5 0

-0.0

5 C

0.0

2

0.0

1

-0.0

1

C2110

933S

U.C

BB

V

OP

S^f

lDC

' Jfa

MM

^to

Jito

ltfo

frM

talL

uL

im.»

.v.-i

>-.r

"

°:

f****w

jjpf^

**w

t» i*

^,,<

* ..

g

''iiil»

iiil»

iiilii.il

-0.2

21

10

93

3S

5.C

BB

H

=0

OPS

=RD

C

1 i

i i

1 1

1 i

i I

1 i

i i

1 i

1 1

1 1

5 10

15

20

0

5

10

15

20

SE

CS

SE

CS

21 1

093354.

VflL

V

21 1

09

33

S5

. V

flL

H=0

D

PS

=flD

C

OP

S=f

lDC

-

0.0

15

[r

\S

^

o.ot

o

: ,

i| «

0

.00

5

~ j

]ii

"^"-

--

Ate

^MM

ttB

Siil

Wiff

i 'p

1JlA

UA

*Ml*

Jufc

*A«

vJl<

*»^^

S

1 If

1L

1 -0

.005

: '

' '

' '

' ' i

' 1

i i

i i

1 i

i i L

1 -0

.0 ID

y i

x\ ̂44w

^| !||^

^W

^^^^^^-

r i

, i

, 1

, ,

1 ,

1 i

i .

. 1

i ,

, i

1

5 10

15

20

05

10

15

20

SEC

S SE

CS

2U

0933S

6.C

BB

H

=90

OP

S=f

lDC

0.1 0

'-

-0.1

r 2U

0933S

6.V

RL

H=9

0 O

PS

=flD

C

0.0

1

-0.0

1

10

SEC

S15

20

100

0.

I

lOO

r

300.

I

100

30O

.I

Figu

re A4

7. S

caled

seismograms

and

spec

tral

ra

tios

of ev

ent

on J

uly

30,

1985

(Julian

211)

at

09:33 for

the

vertical,

horizontal (N-S a

nd E

-W)

components,

resp

ecti

vely

, of stations C

BB/VAL.

2110933SU.CBC V

OPS=RDC

0.0

5 0

0.0

5

0.

10

0.

15

211D933SU.VRL V

OPS=RDC

0.0

2

p-

0.0

1

E-

-0.0

1

~

10

SE

CS

2U

0933S

5.C

BC

H

=0

OP

S=f

lOC

2H

09

33

S6

.CB

C

H=

90

OP

S=R

OC

O.li i-

1520

2U

D933S

5.V

RL

H=

0 O

PS

=RO

C2110933S6.VRL H=90

OPS=

flOC

0.01

r

-0.01

r

100 10

0. 1

1020

HZ

IDOr

30

100 10

0. I

1 '

' '

1020

HZ30

Figu

re MS. S

cale

d se

ism^

rams

an

d spectral ra

tios

of

even

t on

July

30,

1985

(J

ulia

n 21

1) at 0

9:33 for

the

vert

ical

, horizontal (N-S a

nd E

-W)

components,

resp

ecti

vely

, of s

tati

ons

CBC/

VAL.

2H

09

33

SU

.CB

D

V O

PS

=flD

C2

U0

93

3S

5.C

BD

H

=0

OP

S=f

lDC

211093336.CBD H=90

GPS=

flDC

2110

933S

H.Vf

lL V

OPS=fiDC

2ll0

93

3S

5.V

flL

H

=0

OP

S^f

lDC

2ll0

93

3S

6.V

flL

H

=90

OP

S=f

lDC

0.01

r

-0.01

r

lOO

r-r

0. 1

100

0. 1

tOQ

0. I

Figu

re A4

9. S

cale

d seis

mogr

ams

and

spec

tral

ra

tios

of ev

ent

on J

uly

30,

1985 (Julian

211)

at 0

9:33

for

the

vertical,

horizontal (N-S a

nd E

-W)

comp

onen

ts,

resp

ecti

vely

, of stations C

BD/VAL.

21 1093334.CBE V

GPS=

flDC

2110933S5.CBE H=0

OPS=PDC

2U

0933S

6.C

BE

H

=90

OP

S=R

DC

TIM

E:

0 =

I.00

O.O

U r

0.0

5 r

-0.0

5

-

\

211093334.V

RL

V G

PS

=flD

C

-0.0

1

r

i en

O

tOr

2110933S

5.V

RL

H=

0 G

PS

=flD

C

SE

CS

21

10

93

3S

6.V

RL

H

=90

GP

S=P

DC

TIM

E:

0 =

1.0

0

SE

CS

0.0

15

r-

0.0

1

-0.0

1

lOOi

i i

i i

i i

i i

lOO

l I

I I

I I

I I

!

1020

30O

.I

HZ

lOO

r

lOr

30

0.

110

\

j^^^

i I

i10

S

EC

S15

20

20

30

HZ

Figu

re A5

0. Sc

aled

se

ismo

gram

s an

d spectral ra

tios

of

event

on J

uly

30,

1985 (Julian

211) at

09:

33 for

the

vertical,

horizontal (N

-S a

nd E

-W)

comp

onen

ts,

resp

ecti

vely

, of s

tations

CBE/VAL.

RSGRF:22-OCT-85. PLOT DECIMftTED BY:2

0.4

0.3

0.2

0.1

0 L

2111208RU.VflL UP. 0.0

11208RU.MUN UP. 0.0

^*fr"*2111208RU.CBfl UP. 0.0

||||^

10 SECS

2111208RM.CBC UP. 0.0

2111208R4.CBD UP, 0.0

UP, 0.0

15 20

Figure A51. Scaled seismograms for event 2111208 (vertical components)

A-51

fiSGRF:22-OCT-85. PLOT DECIMflTED BT:2

0.6

O.U

0.2

0 L

^jy

10 SECS

15

211l208R5.VflL H=0. 0.0

2111208R5.MUN H=0, 0.0

2111208R5.CBfl H=0. 0.0

2111208R5.CBB H=0. 0.0

2111208R5.CBC H=0. 0.0

21I1208R5.CBD H=0. 0.0

2111208R5.CBE H=0, 0.0

20

Figure A52. Scaled seismograms for event 2111208 (N-S components).

A-52

RSGRF:22-OCT-85. PLOT DECIMRTED BY:2

'2111208R6.Vfll_ H=90, 0.0

0.6

o.y

0.2

2111208R6.MUN H=90, 0.0

llfftJtVA^^ H=90. 0.0

2111208R6.CBB H=90. 0.0

2111208R6.CBC H=90, 0.0

2111208R6.CBD H=90. 0.0

2111208R6.CBE H=90. 0.0

10SECS

15 20

Figure A53. Scaled seignograms for event 2111208 (E-W components).

A-53

was"-*"1 "-°

Ofjinoc

Mr ^

Figure A54. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 12:08 for the vertical, horizontal (N-S and E-W) components, respectively, for station VAL.

A-54

war- 1

sin; ars-i

Figure A55. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 12:08 for the vertical, horizontal (N-S and E-W) components, respectively, for station MUN.

A-55

Figure A56. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 12:08 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBA.

A-56

Figure A57. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 12:08 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBB.

A-57

ll^l^l^l1^

I?OBIW.CBC HrtO

Figure A58. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 12:08 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBC.

A-58

S-o.os

-0.10

-0. IS

ftUHXK.CK) I

Figure A59. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 12:08 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBD.

A CQ

was"-

Figure A60. Time series and Fourier amplitude spectra of event on July 30, 1985 (Julian 211) at 12:08 for the vertical, horizontal (N-S and E-W) components, respectively, for station CBF.

A-60

21U

208R

U.M

UN

V

OP

S=R

DC

2U

1208R

5.M

UN

H

=0

OP

S=R

DC

2U

12

08

R6

.MU

N

H=

90

OP

S=R

OC

0.0

5

-0.0

5

21 t

l208R

4.V

qL

Vnr

n-no

r

0.0

2

10

SE

CS

10

SE

CS

1520

0.2

rr

O.I

r 21

U208R

5.V

RL

H=

0O

P5-

IIDC

0.02 I7

o.ot °

-0.0

1

-°-02

20

^$fa

***«

*ft

10

SE

CS

15

0.

I

-O.I

r 2111208R6.VOL H=90

OP

S^f

lDC

OM*-,V**

l**Vr- ,<v

-V 20

0.0

5

-0.0

515

\

100 ID

10

100 10 -

300.

Ia_J_l

10

20HZ

100 10

300.

1

Figu

re A6

1. S

caled

seis

mogr

ams

and

spectral ra

tios

of

event

on J

uly

29,

1985 (Julian

211)

at 12:08

for

the

vert

ical

, horizontal (N

-S and

E-W)

components,

respectively,

of stations M

UN/V

AL.

2U

1208R

U.C

Bfl

V O

PS

=flD

C2111208R5.CBR H=0

OPS=

flDC

2111208R6.CBR H=90

OPS=qDC

21U

208R

U.V

RL

Vnp

s-nn

c

10S

EC

S0

5

21

11

20

8R

5.V

qL

0.02

-0.0

2

10

SE

CS

15

X0.0

2

0.0

1 0

-0.0

1

-0.0

2

20

1 |

10

SECS

15

211 I208R6.

Vqi_

H=

90ops-noc

20

0.05

-0.05

, JfWiftftf^

ww

-

10

3EC

S15

20

lOO 10

0.?D

HZ

100 ID

300.

I10

20HZ

100

0. 1

30

Figu

re A6

2. S

cale

d seismograms

and

spec

tral

ra

tios

of ev

ent

on J

uly

29,

1985 (J

ulia

n 21

1) at 12

:08

for

the

vert

ical

, horizontal (N-S a

nd E

-W)

comp

onen

ts,

resp

ecti

vely

, of

stations

CBA/

VAL.

21

U2

08

RU

.CB

B

V O

PS

=flD

C21U

208R

5.C

BB

H

=0

OPS

=RD

C2111208R6.CBB H=

90

OPS=RDC

0.05

-0.05

- 2111208RU.VRL V

I CTl

0.02

-0.02

10

SECS 10

SECS

15 15

20

x

0.1 0

-O.I

ll^^

2111208R5.VRL H=0

OPS=ROC

10

SECS

0.02

0.01

<n i

0 o

-0.01

-0.02

2010

SE

CS

15 15

0. 15

0. 10

0.05

0

-0.0

5

^MW^^vw«^

y^

20

2111208R6.VRL H=

90

10 SECS

1520

X

0.05

J -0

.05

20

10

3ECS

X

20

IDr

0. I

1020

HZ

10

1020

HZ30

Figure A63. S

cale

d se

ismo

gram

s and

spectral ra

tios

of

event

on J

uly

29,

1985 (Julian

211)

at

12

:08

for

the

vertical,

horizontal (N

-S a

nd F

-W)

comp

onen

ts,

resp

ecti

vely

, of s

tations

CBB/VAL.

2U

12

08

RH

.CB

C

VO

PS

=RD

C2U1208R5.CBC H=0

OPS=RDC

2111208R6.CBC H=

90

OP5=RDC

0.

15 r

2111208RH.VRL V

ors=

rmc

0.02

-0.02

10

SECS

1520

21 1

1208R5. VRL H=0

OPS-

HUG

0.02

0.01

-0.01

-°-02

|iWW

nM^*

*^'^

'H'iI^

WN^

*

10

SECS

15

2111208R6.VRL H=

90

OPS-ROC

20

0.05

-0.05

10

SECS

1520

100 10

0.10

HZ

100

30

10-

0. I

1020

HZ

100

300. 1

Figu

re A64. S

cale

d se

ismo

gram

s and

spectral ra

tios

of ev

ent

on J

uly

29,

1985

(Julian

211) at

12:08

for

the

vertical,

horizontal (N-S a

nd E

-W)

comp

onen

ts,

resp

ecti

vely

, of stations C

BC/V

AL.

2111208RU.CBO V

OPS=RDC

2111208R5.CBD H=0

OPS=ROC

2H1208R6.CBD H=

90

OPS^RDC

\

>

01

0 5

21H208RU.VPL V

10

v SECS

0.02

-0.0

100

10

SECS

15

\

2111208R5.VRL H=0

OPS=RDC

20

0. t

10

SECS

15

2111208R6.VRL H=

90

OPS=RDC

0.0

2

0.0

1 0

-0.0

1

-0.0

2

I/

j- \- 1-

!4mt

flntai

UM*^

iii4k

^

, ,

1 ,

.

\

^ 'I .,

1 ....

1 ....

20

0.05

-0.05 100

0. I

10 sees

15

X

20

Figu

re A6

5. S

cale

d se

ismo

gram

s an

d sp

ectr

al ra

tios

of

event

on J

uly

29,

1985 (Julian

211)

at

12

:08

for

the

vertical,

horizontal (N-S a

nd E

-W)

components,

resp

ecti

vely

, of

stations

CBD/

VAL.

21U

208R

U.C

BE

V

OPS^

RDC

21

H2

08

R5

.CB

E

H=0

O

PS=H

DC

2U

1208R

G.C

BE

H

=90

2H

12

08

Rli.

VR

L

VoP

3--n

i)L

10

v SE

CS

0.02

-O.Oc

10

3ECS

2U

1208R

5.V

RL

H=0

0.02

O.U1

0

-0.0

1

-0.02

20

0.05

-0.05

2111208R6.VOL H=

90

OP5=RDC

10

SECS

X

10 SECS

1520

0.05

-0.0

5I

' I

I I I L

&* *

10 :-ccs

1520 20

100 ID n. i

-J-

o

100 to

300.

1

HZ10

20HZ

100 10

300. I

Figu

re A6

6. Sc

aled

se

ismo

gram

s an

d spectral ra

tios

of

event

on July 29,

1985 (J

ulia

n 211) at

12:08

for

the

vert

ical

, ho

rizo

ntal (N

-S an

d E-W) co

mpon

ents

, respectively,

of st

atio

ns C

BE/V

AL.

0.0

5

in i

0 o

-0.0

5 C2

U1208R

H.C

BB

V

OP

S=f

lOC

yL.

.H A

i

.II.JA

d If

HM

Wtil

5

ifflili

M Jilil M

l ill

blJl

L i «

L M

KIlifilff

l^^

. ,

i ,

, ,

, i

i10

15

v

SE

CS

X ******

, ,

, 1 20

2lll2

08R

ii.C

BR

V

0.01

4

0.02

0

-0.02

-O.OU

10 SEC:

1520

2U

12

0B

R5

.CB

B

H=

0 O

PS

=flD

C21U

208R

6.C

BB

H

=90

O

PS

=RD

C

0. 15 r

o. t

-O.t

- 2ltl208R5.CBfl H=0

OPS=

flDC

2ttt2

08

R6

.CB

fl

H=

90

OP

S=R

DC

0.0

5 0

-0.0

5

_n

i n

f (III,.

..

- ',.,,!,,

: ^$V

$f!^^

JIM

' '

V , ,

1 ,

, ,

, 1

, ,

, ,

110

3LC

S15

too 10

0.

1U

HZ

20

too

300.

I

too tO

r

0.

I30

Figu

re A67. S

cale

d se

ismo

gram

s an

d spectral ra

tios

of

even

t on J

uly

29,

1985

(Julian

211)

at

12:08

for

the

vertical,

horizontal (N-S a

nd E

-W)

comp

onen

ts,

resp

ecti

vely

, of st

atio

ns C

BB/CBA.

2111

208R

I4.C

BC

V

OPS

=RO

C21

1120

8R5.

CBC

H=0

OPS=

RDC

2111

208R

6.CB

C H=

90

OPS^

RDC

0. 1

5 r

21 11208RU.CBR V

OPS- nni

O.OU

0.02

0

2ttl

208R

5.CB

fl H=

OP3=

flUC

\

^^^

;' ^^Xl

(fte^*^^

10

5ECS

20-O.OU

2lll208R6.CBfl H=90

OPS-

flDC

0.0

5 0

-0.0

5

n i n

;/

-

"'' «

. L

i. i,fl

JW$^

^^i

,IM

!'

'If

10 3CCS

1520

too ID

0.10

20

100

30

10

1 r

0. 1

1020

HZ

100

300,

I

Figu

re A6

8. S

cale

d se

isin

ogra

ms and

spectral ra

tios

of ev

ent

on J

uly

29,

1985 (Julian

211)

at 12

:08

for

the

vert

ical

, ho

rizo

ntal

(N-S a

nd E

-W)

comp

onen

ts,

resp

ecti

vely

, of

stations C

BC/C

BA.

2111

208R

U.CB

D V

OPS=

flDC

2111208R5.CBD

H=0

OPS=

flDC

2111208R6.CBD

H=90

ops=noc

21

11

20

8R

I1.C

BR

V

ors^not.

o.ou

0.02 0

-O.OU

10

SEC3

1520

2111208R5.CBR H=0

211 1208R6.CBR H=90

ors^noc

0,0

5 0

-0.0

5

-0.

10 C

s

H,fW

»*M

* -*

,,v

,

-

v1

'll ''

'

|! IJ ' 1"

______

5 10

15

2

too

lOO

lOOr

Figure A6

9. S

caled

seis

mogr

ams

and

spectral ratios o

f ev

ent

on J

uly

29,

1985

(J

ulia

n 211) at 12

:08

for

the

vertical,

horizontal (N-S a

nd E

-W)

comp

onen

ts,

resp

ecti

vely

, of stations C

BD/C

BA.

2tlt2

08

Rii.C

BE

V

OP

S=P

DC

2H

12

08

R5

.CB

E

H=

0 O

PS

^RO

C2t

tt20

8R6.

CBE

H=90

OPSrflDC

o.oi

i0

.02 0

-0.0

2

-O.O

ll

o.on

0.0

2 0

-0.0

2

-O.O

il

21

H2

08

Ril.

CB

fl

Vor

s-nn

c

10

SECS

1520

3=>

O

0. 1

\

10

SFC3

1520

1001

i

i i

i i

i i

i i

O.O

il

0.0

2 0

-0.0

2

-O.O

il

-0.0

6

r^\

2U

1208R

5.C

BR

H

=0

10

SECS

0.

01

0.0

2 0

-0.0

2

-0.0

14C

100

r/

10

0.

10

ECS

15 15

1020

HZ

\

0.05

-'

-0.0

5 -

20

2ttt200R6.CBR H=

90ors=nDC

20

0.0

5 0

-0.0

5

-0.

10 (

100

;

10

0. 1

30

20 30

Figure A7

0. S

cale

d seismograms

and

spec

tral

ra

tios

of ev

ent

on J

uly

29,

1985

(Julian

211) at

12

:08

for

the

vert

ical

, ho

rizo

ntal

(N-S a

nd f

r-W) co

mpon

ents

, re

spec

tive

ly,

of st

atio

ns C

BE/C

BA.

APPENDIX BVINA EXPERIMENT

SEISMOGRAMS, FODRIER AMPLITUDE SPECTRA AND SPECTRAL RATIOS

The objective of this appendix is to provide the seismograms, Fourier

amplitude spectras and spectral ratios related to the Vina experiments only.

Selected plots of data processed by C. Mueller and J. Watson are presented

herein.

The plots are organized as follows:

Event Type of Plot Figure(s)

2150204

2160657

2161006

2161857

2191002

SeismogramsFourier amplitude spectraSpectral ratios

Seismograms

Seismograms

SeismogramsFourier amplitude spectraSpectral ratio

SeismogramsFourier amplitude spectraSpectral ratio

B1-B3 B4-B9 B10-B14

B15-B17

B18-B20

B21-B23 B24-B28 B29-B32

B33-B35 B36-B38 B39-B40

B

RSGRF:28-OCT-85. PLOT DECIMflTED BY:2

2150204N4.VflL UP. 0.0

Note: All components of stationQCL triggered on the S-wave arrival; therefore a 15.4 second gap is left prior to aligning the S-waves.

o.ou

0.03

0.02

o.oi

215020454.QCL UP, 15.4

215020404.EflC UP, 0.0

2150204N4.HER UP, 0.0

2150204N4.YNE UP. 0.0

2150204N4.REN UP, 0.0

10 20 SECS

30

Figure Bl. Scaled seignograms for event 2150204 (vertical components)

B-l

RSGRF:28-OCT-85. PLOT DECIMflTED BY:2

0.06

0.04

0.02

^ H=0. 0.0

10 20 SECS

2150204S5.QCL H-0. 15.

215020405.EflC H=0. 0.0

2150204N5.HER H-0. 0.0

H=0, 0.0

215020UN5.REN H=0, 0.0

30

Figure B2. Scaled seismograms for event 2150204 (N-S components)

flSGRF: 6-NOV-85. PLOT DECIHflTED BY:2

0.06 -

O.OM -

z: o

0.02 -

~*vHij||^A^^

0 L

2150204N6.VFIL H*90. 0.0

215020456.QCL H=90. 15.4

215020yQ6.EflC H=90, 0.0

2150204N6.HER H=90, 0.0

215020yN6.YNE H=90, 0.0

2150204N6.REN H=90, 0.0

10 20 SECS

30

Figure B3. Scaled seismograms for event 2150204 (F-W components)"~ B-3

Figure B4. Time series and Fourier amplitude spectra of event on August 3, 1985 (Julian 215) at 02:04 for the vertical, horizontal (N-S and E-W) components, respectively, for station VAL.

B-4

O.OOT

0.00?

21502WS5.0CL M«0

I^Wf^l^^^

Figure B5. Time series and Fourier amplitude spectra of event on August 3, 1985 (Julian 215) at 02:04 for the vertical, horizontal (N-S and E-W) components, respectively, for station QCL.

R-S

Figure B6. Time series and Fourier amplitude spectra of event on August 3, 1985 (Julian 215) at 02:04 for the vertical, horizontal (N-S and B-W) components, respectively, for station EAC.

B-6

SO?0«NS HER H=0

Figure B7. Time series and Fourier amplitude spectra of event on August 3, 1985 (Julian 215) at 02:04 for the vertical, horizontal (N-S and F/-W) components, respectively, for station HER.

R-7

Figure B8. Time series and Fourier amplitude spectra of event on August 3, 19R5 (Julian 215) at 02:04 for the vertical, horizontal (N-S and E-W) components, respectively, for station YNE.

SI50?0»I«.«E« «

Figure R9. Time series and Fourier amplitude spectra of event on August 3, 1985 (Julian 215) at 02:04 for the vertical, horizontal (N-S and F-W) components, respectively, for station PEN.

_ _____ _ ___. _ _ _ _____

2150

20U

SI1

.QC

L V

OPS=

flDC

215020US5.QCL H=0

OPS=flDC

215020US6.QCL H=90

OPS=

flDC

DO i

O.OOH

0.00

2 0

-0.002

-O.OOil

0.00

2 0

-0.002

-O.O

Oil

10

2150

204N

I1.V

RL V

OPS=flOC

TIME:

0 =

15.5

SECS

,0ID

SECS

20 20

0.005

-O.O

OB

0 10

2150

201N

5.Vf

lL H=0

OPS=flOC

TIME

i 0

= 15.5

SECS

0.002

0.001 n

-0.0

01

-0.0

02

10SE

CS

20 20

\

0.005 0

-0.0

05

-0.010

O.OOil

0.002 0

-0.0

02

10215020UN6.VFIL H=90

OPS=flOC

TIMEs

0 =

15.5

SECS

10SE

CS

20 20

lOOi

i i

i i

i i

i i

0. 1

1020

lOOr-r

300. 1

HZ

100

0. 1

Figu

re B

IO.

Scal

ed se

ismo

grams

and

spec

tral

ra

tios

of

event

on A

ugus

t 3,

1985 (Julian

215)

at 0

2:04 fo

r th

e ve

rtic

al,

hori

zont

al (N

-S an

d F-

W) components,

resp

ecti

vely,

of stations Q

CL/VAL.

2l50

20liO

U.E

RC

V

OPS

=flD

C215020U05.ERC

H=0

OPS

=RD

C21

5020

1406

. ER

C

H=9

0 O

PS=f

lDC

-0.0

1

215020UNU.VRL

V OP

S=RD

C

SECS

CO I

-0.0

011

10

215020UN5.VHL

H=0

OPS=

RDC

20

0.02

O.OL

0

-0.01

-0.02

SECS

0 10

215020UN6.VRL H=90

OPS=flDC

SECS

20

SECS

SECS

SECS

100 10

1020

HZ30

100 10

1020

HZ30

100 10

0. I

1020

HZ30

Figu

re B

ll.

Scaled s

eismograms a

nd sp

ectr

al ra

tios

of

event

on A

ugust

3, 1985 (J

ulia

n 215) at 0

2:04 for

the

vertical,

horizontal (N-S and

E-W)

co

mpon

ents

, re

spec

tive

ly,

of s

tations

EAO/VAL.

215020UNU.HER V

OPS=

flDC

215020UN5.HER H=0

OPS=flDC

215020UN6.HER H=90

OPS=

flDC

CD ( »

no

0.0

05

21

50

20

liNH

.VR

L

V O

PS

=flD

C

0.0

02

r

-O.O

Oli 10

0 lOr

O.I

1020

HZ

10

15S

EC

S215020U

N5.V

RL

H=0

O

PS

=flD

C

lOOr

300. 1

10

15

SE

CS

20

0.0

1

215020iiN6,VRL H=90

OPS=

flOC

O.O

OU

r/

25

100 10

300. 1

1020

HZ30

Figu

re B

12.

Scal

ed s

eism

ogra

ms a

nd sp

ectr

al ra

tios

of

even

t on

August

3, 19

85 (J

ulia

n 215) at 0

2:04 for

the

vertical,

horizontal (N-S a

nd E

-W)

comp

onen

ts,

resp

ecti

vely

, of s

tati

ons

HER/

VAL.

2150

20UN

U.TN

E V

OPS=flDC

2150

20UN

5.TN

E H=0

OPS=

fiDC

2150

20UN

6.TN

E H=90

OPS=flDC

0,005

-0.005 -

2150

20UN

U.VR

L V

OPS=

HDC

-0

0 5

10

15SE

CS215020UN5.VRL

H=0

OPS=

flDC

10

15

SECS

io

isSE

CS21

5020

UN6.

VRL

H=90

OPS=

flOC

\

-0.0

02 -

100 10

0. 1

1020

HZ30

100 10

0. L

LO20

HZ30

0. L

Figu

re B

13.

Scal

ed se

ismo

grams

and

spectral ra

tios

of

even

t on

Aug

ust

3, 1985 (Julian

215)

at

02:

04 fo

r th

e ve

rtic

al,

horizont

al (N-S an

d E-W) co

mpon

ents

, respectively,

of st

atio

ns Y

NE/V

AL.

215020UNU.REN V

OPS=HOC

215020UN5.REN H=0

OPS=RDC

215020UN6.REN H«

90

OPS=

flDC

2150204NU.VRL V

OPS=flDC

10

15

SECS

2025

0.002

r

-0.0

04

0 5

10

15SE

CS2L5020UN5.VRL H=0

OPS=HDC

2025

1015

SECS

20

0 5

10

15SECS

2L5020UN6.VflL H=90

OPS=HDC

25

-0,0

02 -

20

tOOr-r-T-T-r-r-r-r-r-r

10

O.I

10

20HZ

100

30

10

0.1

1020

HZ

100

30

Figure B

14.

vScaled

seis

mogr

ams

and

spectral ratios o

f event on

Aug

ust

3, 1985 (J

ulia

n 215) at 0

2:04

for

the

vert

ical

, horizontal (N-R and

E-W)

components,

resp

ecti

vely

, of stations P

KN/VAL.

flSGRF: 8-NOV-85. PLOT OEClMflTED BY:2

O.OU r

0.03 -

enX 0.02 -

0.01 -

0 L

2160657m.VflL UP. 6.00

jj||^^

lftHfM<^^ UP, 0.0

2I60657JU.ELC UP, 0.0

*-2160657JU.HER UP, 0.0

2160657JU.YNE UP. 0.0

!|>||l^ 2160657JU.REN UP, 0.0

Note: All components of station VAL triggered on the S-wave arrival; therefore a 6 sec. "gap" is left prior to aligning the S-wave^ _____ .__ _.._ __

10 15 SECS

20 25

Figure B15. Scaled seismograms for event 2160657 (vertical components)

flSGRF: 8-NOV-85. PLOT DEClMflTED BY:2

0.05

0.04

0.03

0.02

0.01

10 15 SECS

20

2160657L5.VRL H-0. 6.00

H=0, 0.0

2160657J5.EMP H=0, 0.0

*H*2160657J5.HER H=0, 0.0

2160657J5.YNE H=0, 0.0

2160657J5.REN H=0, 0.0

25

Figure B16. Scaled seismograms for event 2160657 (N-S components) --- B-T6 "

RSGRF: 8-NOV-85. PLOT OECIMRTEO BT:2

0.05

0.04

0.03

in x2:

0.02

0.01

10 15 SECS

20

2160657L6.VflL H=90. 6.00

2160657J6.ELC H=90, 0.0

2160657J6.EMP H=90, 0.0

2160657J6.HER H=90, 0.0

2160657J6.TNE H=90, 0.0

2160657J6.REN H=90, 0.0

25

Figure B17. Scaled seismograms for event 2160657 (E-W components)

B-17

flSGRF:28-OCT-85. PLOT DECIMflTED BY:2

2161006F4.VRL UP. 0.0

'2161006G4.HER UP. 0.0

2161006F4.YNE UP. 0.0

0.020 r

0.015 -

0.010 -

0.005 - I

0 L

10 15 SECS

20

2161006FIJ.REN UP. 0.0

25

Figure B18. Scaled seismograms for event 2161006 (vertical components)

B-18

flSGRF:28-0CT-85. PLOT DECIMflTED BY:2

2161006F5.VRL H=0. 0.0

0.020 r

0.015 -

0.010 -

0.005 -

0 L

2161006G5.HER H=0, 0.0

2161006F5.YNE H=0. 0.0

61006F5.REN H=0. 0.0

10 * 15 SECS

20 25

Figure B19. Scaled seismograms for event 2161006 (N-S components)

flSGRF: 7-NOV-85. PLOT DEClMflTED BY:2

2161006F6.VRL H=90. 0.0

0.020 r

0.015 -

0.010 -

0.005 -

0 L

2161006G6.HER H=90. 0.0

2161006F6.YNE H=90. 0.0

2161006F6.REN H-90. 0.0

10 15 20 25 SECS

Figure B20. Scaled seismograms for event 2161006 (E-W components)

ftSGRFs22-0CT-85. PLOT DECIHflTED BT:2

UP, 0.0

216l857G«.HUN UP. 0.0

216i857GH.EflC UP. 0.0

2161857GH.TRR UP, 0.0

216I857GH.REN UP. 0.0

10 15 20 25 SECS

Figure B21. Scaled seismograms for event 2161857 (vertical components)

B-21

RSGRF:22-OCT-85. PLOT DECIMflTED BY:2

0.06

o.oyCO

ac <_)

0.02

I

" 216l857F5.Vfll_ H=0. 0.0

2161857G5.MUN H=0, 0.0

=0 ' 0.0

2161857G5.TRfl H=0. 0.0

2161857G5.REN H=0. 0.0

10 15 20 25 SECS

Figure B22. Scaled seisinograms for event 2161857 (N-S components)

B-22

flSGRF:24-0CT-85. PLOT DECIMRTED BY:2

0.08

0.06

0.02

1

^^-w% -2161857F6.VRL H=90. -1.90

2161857G6.MUN H=90. -1.90

2161857G6.ERC H=90. -1.90

Note: Because of a timing "glitch" at 1.8 sec of the records - -- of station EAC, plots were corrected by skipping into the

trace by 1.9 seconds. ___________ _.__ __

2161857G6.TRfl H=90. -1.90

12161857G6.REN H=90, -1.90

10 15 SECS

20 25

Figure B23. Scaled seianograms for event 2161857 (N-S components)

B-23

lfl^^^ "

Figure B24. Time series and Fourier amplitude spectra of event on August 4, 1985 (Julian 216) at 18:57 for the vertical, horizontal (N-S and E-W) components, respectively, for station VAL.

B-24

(1857C5 MIW H-0

Figure B25. Time series and Fourier amplitude spectra of event on August 4, 1985 (Julian 216) at 18:57 for the vertical, horizontal (N-S and E-W) components, respectively, for station MUN.

B-25

Figure B26. Time series and Fourier amplitude spectra of event on August 4, 1985 (Julian 216) at 18:57 for the vertical, horizontal (N-S and E-W) components, respectively, for station EAC.

Figure B27. Time series and Fourier amplitude spectra of event on August 4, 1985 (Julian 216) at 18:57 for the vertical, horizontal (N-S and E-W) components, respectively, for station TRA.

B-27

Figure B28. Time series and Fourier amplitude spectra of event on August 4, 1985 (Julian 216) at 18:57 for the vertical, horizontal (N-S and E-W) components, respectively, for station REN.

R-?8

2161857GU.MUN

V OP

S=HD

C2161857G5.MUN

H=0

OPS=

HDC

2161

857G

6.MU

N H=

90

OPS=

HOC

2161857FU.VRL V

OPS=RDC

10

15

SECS

2025

0.005

-

-0.0

05 -

CO ro

vo

100 10

0. 1

5 10

15

SECS

2161857F5.VRL H=0

OPS=RDC

0.0

05

i-

-0.0

05

-

100 10

1020

30

0. 1

1020

HZ

HZ

20

0.02

-0.0

2

0 5

10

15SECS

2161857F6.VRL H=

90

OPS=RDC

20

0.005

-/

-0.0

05 10

0 I0r I -

300.

I

25 \

20

25

1020

30HZ

Figu

re R

29.

Scaled s

eismograms a

nd s

pectral

rati

os o

f ev

ent

on A

ugus

t 4,

19

85 (Julian

216) at

18:57 for

the

vertical,

horizontal (N-S a

nd E-

W) co

mpon

ents

, respectively,

of stations M

UN/VAL.

03 I GO O

g

-0.0

05 -

100 10

SECS

lOOl

I

102D

30HZ

100 10

0.1'

'

' '

'30

0. 1

1020

30HZ

Figu

re R

30.

Scaled s

eismograms a

nd sp

ectr

al ratios o

f ev

ent

on A

ugus

t 4, 19

85 (Julian

216) at

18:

57 for

the

vert

ical

, ho

rizo

ntal

(N-S a

nd E

-W)

comp

onen

ts,

respectively,

of stations E

AC/V

AI,.

2161857GH.TRR

V OP

S=fl

DC2161857G5.TRn

H=0

OPS=

flDC

2t61857G6.TRn

H=90

OPS=flDC

2l6l857FU.VflL

V

GPS=RDC

10

15SE

CS2161857F5.VRL H=0

OPS=

flDC

0.005

-

CD

I 00

-0.0

05 -

0.005

-0.005

10

15

SECS

20

\0.02 r

-0.0

1 -

0 5

10

15SECS

2161857F6.VHL

H=90

OP

S=PO

C

0.00

5 -/

20

Lj 25

-0.0

05

100 to

1020

HZ30

100 to

0. 1

1020

HZ30

100 10

0.1

10

20

HZ30

Figu

re R

31.

Scal

ed se

ismo

gram

s an

d sp

ectr

al ra

tios

of

event

on A

ugus

t 4, 1985 (Julian

?16)

at 18:57

for

the

vert

ical

, ho

rizo

ntal (N-S an

d F-

W) co

mpon

ents

, respectively,

of st

atio

ns T

PA/V

AT,.

2161

857G

U.RE

N V

OPS=

flDC

2161857G5.REN

H=0

OPS=

HDC

2161

857G

6.RE

N H=

90

OPS=

RDC

0.01

-o.ot

2161857FH.VRL

V OP

S=RD

C

10

15

SECS

0.00

5

-0.0

05

-

OJ ro

too 10

0. 1

10

15

SECS

1020

HZ

X0.02

c-

0.01

-

-O.O

t -

2025

D 5

10

15SECS

2161857F5.VRL

H=0

OPS=

flOC

0.005 r

-0.0

05 -

2025

too 10

300. 1

10

20

HZ

10

15SECS

2161

857F

5.VB

L H=0

OPS=

RDC

0.0

05

r

-0.0

05 to

o 10

300.

I1

' '

'

10

15

SEC

S

1020

HZ

20

25

X ,_! 25 30

Figure R

32.

Scal

ed s

eism

ogra

ms a

nd s

pect

ral

ratios o

f ev

ent

on A

ugus

t 4,

19«5 (Julian

216) at

18:

57 for

the

vertical,

horizontal (N-S a

nd F-

W) components,

respectively,

of stations P

FN/VAL.

PSGflF:10-SEP-85. PLOT DECIMflTED BT:«

0.3

0.2

V)

cO

0.1

ll^jflfyft^ 2191002FH.VRL UP. 0.0

2191002GU.TRR UP. 0.0

10

2191002GU.MUN UP. 0.0

30SECS

Figure B33. Scaled seismograms for event 2191002 (vertical components)

B-33

f»SGRFtlO-SEP-85. PLOT DECIMflTED BY:U

^-2191002F5.VRL H*0. 0.0

0.5

0.3

2191002G5.TRR H=0, 0.0

CO s,ac o

0.2

0.1

2191002G5.MUN H=0. 0.0

10 20 SECS

30

Figure B34. Scaled seismograms for event 2191002 (N-S components)

B-34

RSGRFilO-SEP-85. PLOT DECIHBTED

»^^ -2l9lOff2F6.VflL H«90, 0.0

0.5

0.4

0.3

enXc_>

0.2

0.1

2191002G6.TRR H-90, 0.0

10 20 SECS

2191002G6.MUN H=90. 0.0

30

Figure B35. Scaled seismograms for event 2191002 (B-W components)

Figure B36. Time series and Fourier amplitude spectra of event on August 7, 1985 (Julian 219) at 10:02 for the vertical, horizontal (N-S and T5-W) components, respectively, for station VAL.

B-36

Figure B37. Time series and Fourier amplitude spectra of event on August 7F^ <S±1?19) " 1Cl:0!? ,far the Vertica] ' «wri«ntaj ^-f and R-W) components, respectively, for station WW."~'~

Figure B38. Time series and Fourier amplitude spectra of event on August 7, 1985 (Julian 219) at 10:02 for the vertical, horizontal (N-S and E-W) components, respectively, for station TPA.

B-38

2191002GU.MUN V

"DPS

=ROC

2191002G5.MUN H=0

OPS=flOC

2191002G6.MUN ht=90

OPS=POC

0.05

-0.05

2l9

t002F

ii.V

flL

V O

PS

=PD

C

CO

I OJ

O.D2

-0.02

10

ISSE

CS2l

9t00

2F5.

VflL

H=0

OPS=POC

lll^^

10

15

SECS

2025

0.01

0

-0.01

10

15

SECS

20 20

25 25

0.05

-0.05

- 0 5

10

15SECS

2191002F6.VRL H=

90

OPS=flOC

0.02

-0.02

10

15

SECS

20 2025

100 10

0. 1

" '

' '

'10

HZ20

30

100 10

toHZ

2030

tOOr

-r

Figu

re R

39.

Scaled s

eism

ogra

ms a

nd s

pectral

ratios o

f ev

ent

on A

ugus

t 7, 19

85 (J

ulia

n 21

9) at

10:02

for

the

vert

ical

, ho

rizo

ntal

(N-vS and

F-W) co

mpon

ents

, re

spec

tive

ly,

of st

atio

ns M

ITN/

VAL.

2191002GU.TRR V

OPS=flDC

2191002G5.TRR H=0

OPS=RDC

2191002G6.TRR "H=90

OPS=

flDC

o.o a

0.02

-0.02

2191

002F

I1.V

RL V

OPS=flOC

10

15

SECS

0.02

-0.02

2025

ll^

10

15

SECS

2025

0.05

-0.05

5 10

, 15

SECS

2191002F5.VRL H=0

OPS=

flDC

0.01 -

-0.0

1 r

2025

o.ou

0.02

0

-0.0

2

-0.0

1

0 5

10

15SECS

2l91002F6.VflL H=90

OPS=fiOC

0.02

-0.0

2

10

15

SECS

20 20

25 25

LOO 10

O.I

1020

HZ

100

30

10

0. 1

10HZ

2030

0. I

Figure MO.

Scaled s

eismograms a

nd spectral ratios o

f ev

ent

on A

ugust

7, 19

85 (Julian

219) at

10:02 fo

r the

vort

ical

, ho

rizo

ntal

(N-R and

K-W) co

mpon

ents

, re

spec

tive

ly,

of stations T

PA/VAL.