division headquarters · 1/27/1976 · rf50u~ces iuildiho. room 13'1 1116 ninth strflot...
TRANSCRIPT
·'-' ... ,
:: -~'"'•'- ..... 1- (.~tt-ORNIA Ttif RESOURCES AGENCY
DEP ... RTMENT Of COH$ERYATIOH
••
DIVISION OF MINES AND GEOLOGY DIVISION HEADQUARTERS Rf50U~CES IUILDIHO. ROOM 13'1 1116 NINTH STRfloT SACAAMENTO, CA P58l •
Diattid OM~,; LOS ANGELES Junlpera Serra lld:g,, atn. 1065 107 Soutt. Brovdway 90012
James O. Berkland
MCR>.MENTO RWIOIJIWllf. lldg., R111. 118 l.Cl6 Ninth St,..t 95814
Sr. Engineering Geologist Land Development Engineering & Surveying County Government Center, East Wing 70 West Hedding Street, Seventh Floor San Jose, California 95110
Oear Jim:
S4N FRANCISCO Fitrry hUdlng 9•111
(415) 557-0413
August 31. 1976
EDMUND G. IROWH JI., Go.., ...
This Is to ackna,.iledge receipt of the 36 geologic reports and report addenda with your letter of August 9, 1976.
Host of these reports lie within Special Studies Zones and have been reviewed and approved by you on behalf of Santa Clara County. These reports will therefore be open-filed in compliance with the Alqulst-Priolo Special Studies Zones Act.
' The reports for sites outside of the Special Studies Zones
will be filed informally.
I note that figure 2 and the Appendix are missing from report no. 8 (Gillette property, Call of the Wild Road, file no. 12C7S.1). Please submit these to complete our files.
It is also noted that most of these reports rely heavily, If not solely, on geophysical data and a review of the literature., This is especially true of the R.B. Rose reports, which comprised 18 of the submitted reports. As you are aware from previous discussions, I
.. • ..
-2-
am concerned with the adequacy of fault Investigations being conducted throughout the State (see enclosed CDHG Note 49 and abstract}. Without strict local reviews, It Is unlikely that the quality of these Investigations will significantly Improve.
EWH/mkr
cc: A-P file
Enclosure
'
Sincerely yours,
EARL W. HART Office of the State Geologist RG 462 CEG 935
•
I ,, .
County of Santa Clara California
August 9, 1976
State Geologist c/o Earl Hart Geologist, CDMG Ferry Building San Francisco, CA 94111
County Government Center, East Wing 70 West Hedding Street, Seventh Floor
299-2871 San Jose, California 95110
REGARDING: GEOLOGIC REPORTS SUBMITTED TO SANTA CLARA COUNTY
This letter accompanies 36 copies of geologic reports (list attached) which this office has received pursuant to state and county regulations, At the local level, ~1J ___ :i;:e_p9rts have been approved by me although several required additional cl.ar-ification or documentation prior to approval.
In addition to the reports governed by the revised AlquistPriolo Act, we are sending additional reports covering single sites in Special Studies Zones for your open files,
I acknowledge and apologize for the delay in delivering these reports to you, and I expect to remain "current" in the future.
<;;:;,..., (3,~-"'t. "
•
JAMES 0 • BERKLAi~D Sr, Engineering Geologist
JOB:md
Attachment
An EQual Qpportun1ry Employer
l.
2.
3.
4.
5.
6.
7.
B.
9.
10.
11.
12.
11.
15.
16.
17.
lH.
19.
2.0.
21.
v. /1.
2h.
27.
R~PORlS TRANS!>' ITTED TO STATE GEOL()(; IST 8-lo-7f...
STREET
Si~rra Ko.ad
llarn<Jrd Road
Corra 1 itos Lane
Crothers lload
Call ol the Wild Ro3d
Ca 11 <>l tlit• Wild Road
El Cami no lliguera
Ev.:in:=: Road
Hubbard Way
Kennedy Ro.:.id
Kent Wny
Mt. Hamilton Rd. (Off)
Mt. Harni Hon Rd. (Of 0•
Mimos:i Court
Norwood Avt.•n1H .. '
Quin1hy K1) 0Jd
Wuud Hond
J'urter
H.t~<lwuud Gu l.c h Ko.:1tl
S11rnrni t Ho<t<I (nrf)
APPLICANT
Snodi;?;ras C'
Ila yes
Bay
Cadwallader
Yim
Hawkins
Mueller
Gillette
Evans
Serpa
Wiln1ot
Fol lmar
Illa ke
Chet al:'d
Ross
Borges
R11floln
lfl•nm(' n
Stroud
Souzn
SCCo P"hlic Works Alon?o
FlLE ~O.
7'lR75. 5]4
18S75. I
12P75.1
21S73.3l
76Rl7.600
17575.10
76B12.3531
12C75.l
74B15, 865
74M15. 8 76
76Gl 7. 226
76811.3527
73Ml2. 724
74M12 .853
17575.15
17S76.4
4S 75. 7
75Rl8.557
751ll2. 3514
18576.I
"14Rl 7. 508
72B4. 3(19)
1SS7'i.2
7'iM12 .YV,
75Hl7.57t-.
l!S74.ll
llATE 1IPPROl'Ell
io-24-76
\-<-7f
5-10-76
4·-9- 75
4-23-76
8-28-75
b-7-76
4-<J- 76
2-11-76
6-5-75
6-7-76
2-26-76
12-30-75
12-26- 75
9-17-75
i- 7 - 76
1(1-7-?'i
111-H-75
!..-14-76
H-2H- 7">
:.~~<l-7b
\j-/,J-7C)
2- l!>-7b
Reports T.-ansmit ted to ;>tate Geologist Page 2
STREET
29. Hi 11 side Road
30, New Avenue
31. Clayton Road
32. Rock hi 11 Road
33. Klein Road
'fl -lo -7(,,
APPLICANT
Weed
Ma lone/Maas
Harris
Dean
Elmer
FILE NO.
75Ml2. 938
22S76.13/ 22875.14
18S75, 14
75Ml5.969
17572.8
DATE APPROVED
11-18-75
8-5-76
6-25-76
8-9-76
The following addenda should be inserted into reports previously transmitted:
34.
35.
36.
Silver Creek Road . ..... (Addendum) + ,.r;~:····' I "t "'•
Fleming Avenue (Addendum Trench log)
Lazy Lane (Addendum)
,
18574.5 (·l'l~Tfl'"'
Raferty/ Rasmussen
Edens
17P74.4
18S75.5 7-29-76
---· -· ··---...,·· •' ----···~- .. ~-----·· -s fAfE G<'dOC,1<TJ 1
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R. Burloo Ras•, M.A. G&:QLOGl51"
E'.:NGtNEElll:INC. GIEOL.O~ tc;:-'1.,.ll'"C~HIAI fltt;(tlll.~AT'IONI)
I~------·~.
Af l
ALLIED GfOPHYSICS
P.O. l!!llo:iic !583 ii,ti,N .J.Os£. C:::.A.. 11181QG <A-Oel 2&B-2soa Ae"'"''' /-'J.,-71. - 9~rt]
ENGINEERING GEOLOGY SECTION LAND DEVELOPMENT ENGINEERING COUNTY OF SANTA CLARA 1555 BERGER DRIVE SAN JOSE, CALIFORNIA 95112
Stroud Minor Land Division
AP 517-05-05) 19+ acres
East side Sanborn Road
Santa Clara County CA
SWi Sec. 14, T.8 S., R.1 W.
Castle Rock Ridge Quadrangle
In-depth Geologic/Seismic Report
R. Burfon Ro••· M.A GP:OL.OGJST
ENOJNl!:ERINQ. CEOl.OGl•T (C°"Ull'QFOl"'llA RlfQll•TllllA"i"ION)
ALLIED GE0Pl1Y51CS
P.O. BO)( 583
B.-.N .Jo&~. eA. !il!l1oa
Mr. Tom Stroud 1655 Johnson Avenue San Jose CA 95129
Dear Mr. Stroud:
January 27, 1976
Re: Minor land division APN 517-05-053 19+ acres East side Sanborn Road Santa Clara County CA
Thank you for the pleasure of our studying this land parcel for your proposed development and use.
This letter is a summary 9f the findings, conclusions, and. recommendations; as sU:ch part of the report.
Your sites:. are dee.med suitable for the construct ion of. two homes with a mutual access roadway from Sanborn Road, usi:ng a private bridge across Sanborn Creek
All structures should be engineered in design. A g factor of 0.25 acceleration should be used in design, applying to living quarters, from a geologic and seismic viewpoint.
No fault trace was found within the planned homes area, based on our geologic, seismic, and reference searching; correlated to the two seismic refraction survey lines.
Mr. Rogers E. Johnson, graduate geologis~ worked with me in the field and report phases.
Please call me if there are any further questions, at your convenience.
Respectfully yours;
C.E.G. 760 G.P. 397
7 copies
( DWOOO Cl 1 -41 Ml. ·ro. C-Al
STATE OF CALIFORNIA
.Delineated In · compllanc• with Chapter 7.5, Dlvlalon 2 of tho Callfornlc Publlc Ro1ourco1 Code
CASTLE ROCK RIDGE QUADRANGLE
0 APN 517~05.;053 OFFICIAL ril1AP
R. Burfoo Ro,., MA G!i:OL.CIOl~T
ENGINll!:ERINO Gli:01..0(11eT 4t:;ALll'"ORNIA RICGl~TRATtotol,
ALLIED GEOPHYSICS
P.O. E;l.Q)( 993 1'-.A.N .JQSE'.: 0 CA. 9.51011
APN 517-05-053
In-depth Geologic and Seismicity Report
Stroud Minor Land Division
East side Sanborn Road Santa Clara County CA
~; January 22, 1976
19+ acres
Introduction; This geologic and seismicity report is
addressed to the pertinent' and basic geologic factors
of the site acreage and to the Alquist-Priolo Special
Studies Act of the State of California (1974). Two
proposed homesites in a two parcel land division, forms
the background of the study and.conclusions. The report
is favorable for wood frame construction with engineered
foundations; together with specific attention to the
slopes involved and their erosion prevention planting.
Three field days were spent on the project, including
two seismic refraction survey lines.
Location; The total acreage lies easterly from the area
drainage creek along the east side of Sanborn Road above
Saratoga, 1ying one mile east of Highway 9; being in the
517-05-053 2.
SW~ of Section 14, Township 8 South, Range 1 West, In
the northerly portion of the U.S.G.S. Castle Rock Ridge
quadrangle (scale 1:24000).
Data: Essential geology,.structure, fault, seismic, slope
and topography are shown and correlated on the plates
between this written summary and the bibliography. An
area index map precedes this portion showing the Alquist
Priolo Special Studies Act zoning; accompanied by a road
index. Field mapping was augmented by two seismic data
refraction line surveys and pertinent reference search.
An appendix of more general seismic and geologic coverage
is included for additional perspective and guidance.
Regional and Site Geology: The property lies lies on high
relief terrain in the San Andreas rift zone (Alquist-Priolo)
facing to the south west in slope at the house sites. It
lies between Castle Rock Ridge to the west and the ridge
connecting Table Mountain and El Sereno Mountain to the
east. These ridges and the N 4o0 W trending rift zone are
the major structural features in the area. Bedrock west
of the fault zone consists primarily of Mid-Tertiary age
elastic sediments; to the east of the fault zone typical
Franciscan, Cretaceous to Jurassic, assemblage rocks are
found: these latter underlie the parcel studied.
Several geologist have mapped the Sanborn Road area
517-05-053 J.
on a broader basis for governmental agencies. The three
most pertinent publications are Rogers (1972), Sarna -
Wojcicki, et al (1975) and the Alquist-Priolo map (1974).
Neither Rogers nor Sarna - Wojcicki indicate adverse site
geologic conditions on the Stroud property. The Alquist
Priolo map shows the property lying within the San Andreas
fault zonir.g and a fault following the bed of Sanborn Creek
which is the western boundary of the parcel. This fault
is probabl~ the contact between Franciscan sandstone to
the east and Franciscan mafic intrusive rocks to the west.
Rogers geologic map shows this. contact farther east near
the center of the Stroud property and maps it as a probable
stratigraphic contact. ·.
Our specific site study map shows that the Stroud area
occupies a portion of a westerly facing steep slope and a
narrow irregular flood plain of Sanborn Creek. Geologic
materials on the site consist of an unknown thickness of
alluvial deposits adjacent to Sanborn Creek and a thin
covering of colluvium and soil overlying the Franciscan
assemblage. These Franciscan rocks consist chiefly of a
hard, fine to medium grained meta-sandstone and a small
sliver of mafic intrusive rock near the south west boundary.
Nature of the contact between the two rock types was not
determined because of poor exposure and distance from the
house sites, but it is probably a fault contact judged on
the regional geologic environment. In any case, our study
and geologic plate shows that almost the entire property,
517-05-053 4.
including both proposed homesites, is underlain by the
meta-sandstone. Heavily slickensided sandstone float was
observed on a small knoll on the upper (easterly) portion
of the property. Air-photos from Santa Clara Co. Dept.
of Transportation (scale 1:12000, Nov. 1971) show a NNE
trending lineation intersecting this area and continuing
over the ridge to the east. No evidence of deep seated
ground failure was detected on or near the parcel although
some soil creep was evident.
Evaluation of Geologic and Seismic Hazards -
Surface Ground Rupture: Structural study integrated with
the two seismic refraction~ survey lines indicate that a
continuous sandstone bedrock foundation underlies both
house sites. Therefore, the danger of ground rupture is
minimal. However, there is everywhere in a major active
fault rift the low probability and possibility of new
rupture traces being formed in a major earthquake.
Ground Failure and Landsliding Hazards: The stability of
the hard meta-sandstone bedrock appears to be excellent.
However, a combination of steep slope, excavation for the
acceGs road, and the addition of foundation weight will
probably reduce this high stability some. Future seismic
shaking will reduce the magnitude of stability of the steep
slope at the house sites and should receive engineering
design attention.
517-05-053 5.
Seismic Shaking: Seismic shaking (magnitude, intensity,
and duration) is a significant hazard in any area close
to the San Andreas fault zone and structures should be
designed and built accordingly. The referred to rig~d
meta-sandstone underlying the proposed homesites should
provide excellent foundation support where little, if any,
amplification of seismic waves nor extended duration
should occur. A magnitude of plus 7.5 earthquake may be
experienced along this sector of the San Andreas fault.
Recommended structure design should include an acceleration
factor of 0.25, from a geologic and seismic viewpoint.
Flood Hazard: It should be noted that the Lake Ranch •.
reservoir dam which is located approximately one mile up
stream from the Stroud property (see quadrangle map) now
straddles the 1906 trace of the San Andreas fault. This
dam was damaged but did not fail in 1906. Consequently
the possibility exists that the next major to great earth
quake on the same trace could cause failure and flooding
downstream. The two proposed homesites studied are at an
elevation of 100 to 120 feet above the stream bed. We
recommend calculations be made of the potential height of
flood waters in the ev-ent of complete dam failure when the
reservoir is at capacity as a factor in house elevation.
Erosion: The owner of this property has removed an area of
vegetation in the vicinity of' the planned homesites which
517-05-053 6.
is necessary. However, additional removal for access and
actual construction should be limited as much as possible.
Construction of an access road to the eastern and higher
portion of the property could cause definite erosion·
problems and is not addressed in this evaluation. Present
bare areas should be replanted as thoroughly as possible
in order to reduce potential problems from accelerated
erosion during future heavy rainfall runoff.
Seismic Refraction Survey Data: Two reversed recorded 180
foot length seismic refraction lines were surveyed, with
their positions shown on an index map. The results are
included in the Time-Dist~nce graph and the Seismic profile,
as computed.into a cross section. Location of the lines
crossed the proposed home sites and were across the strike
direction of regi.onal fault traces. A Bison summing or
slgnal enhancement seismograph was used in the field. The
technique measures sub surface shock wave travel times in
milliseconds, calculating the ground velocities in feet
per second. Depths to higher velocity horizons are shown
from the surface, entered on the Time-Distance graph and
used in profile construction. Three velocity horizons
were found.:
v~ .)
1100-1500 ft, per sec.
4000-5000 II " "
6000-10000 " II II
Organic soil & colluvium
Bedrock (Ks) tight cracks
Fresh bedrock
517-05-053 7.
Seismic refraction interpretation, geology, and vicinity
reference d.ata are evaluated in context.
Conclusions: It is our opinion, as based on the geologic
site mapping, references correlation and structure study,
that this site is favorable and suited to the proposed
two home construction within the limits of the index fuap
positions cf the seismic refraction survey lines, with an
access roadway from Sanborn Road. This conclusion includes
the geologic and seismic recommendation made in this study
report as requisites. Field days exceeded three.
Recommendations: .-
1.) Included as cited throughout report
2.) Replanting of cleared areas after construction
J,) Engineered foundations and structures to meet 0.25
g acceleration as a design minimum
4.) Rainfall erosion control in construction areas
5.) Flood hazard control of housing elevation.
Rogers E. Johnson Graduate geologist
7 copies
Respectfully submitted,
R. Burton Rose C.E.G. 760 G.P. J97
=
'
Stroud klnor Land Division
APN 517-05-053 19+ acres
East side of Sanborn Road and creek
Santa Clara County CA
'
Approximate scale 1 In. = 500 ft.
Property Outll~e Map
lfrom Santa Clara Co. cadastral survey: Sheet 125 - Jan. 1970)
i -j I
. __ j
Stroud Minor Land Division
APN 517-05-053 19+ acres
East side of Sanborn Road and creek
Santa Clara County CA
SI te l n '!lest Sec. 14, T .8 S., R.2 W. Sea I e 1 11= 500 1
Contour interval = 40 ft.
Site Area Topography
(from USGS Castle Rock quadrangle: enlarged)
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TABLE OF RE:LllTIVE GEOLOGIC STABILITY CONDITIONS
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{.'.'-':') ?I 1'7'"'"' frTl'> r-, !I ~ E! ~,;:~ Jlx,)j ~ \.:.1 INSTRUMENTS 5703 - 36th Strt~t West
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TRAVERSE . C T.t:'..O h l?AA""S'.,.~ ~ "°""''# A/3::1"•.tF
LOCAYlON /DESCRIPTION -'--------------------------
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,Stroud
A-/1..,-a t:' -/141-.0
APN 517-05-053
Seismic Refraction Survey Line
References
Map .showing recently active breaks along the San Andreas fault between the central Santa Cruz Mts. and the northern Gabi Ian Range CA: Sarna-Wojcicki, Pampeyan, E. H., and Hall, N. T •• U,S.G.S. M.F. 650 (1975)
Solis of Santa Clara County: Soll Conservation Service
US Department of Agriculture ( 1968)
,,. Interim Report and Study l/aps: Santa Cruz Mts. (1971)
California Division of Mines and Geology Santa Clara County & So. County Area, Prel. Rpt. 18 (1973)
Geologic Guidebook of the San Francisco Bay Counties: California Division of //,Ines, Bui letln 154 (1951)
Proceedings of Conference on Geologic Problems of the San Andreas Fault System: Stanford University sessions, Publications/Geological ~.ciences (1968) (1973) -
Geology of Northern Callfornla, Division of Mines and Geology
Bu I I et In 190: Ca 11 f. ( 1966)
Intensity Distribution of San Francisco Earthquake 1906; adapted from Carnegie Institute Report, Map 23: as reproduced in "Earthquake Enginee.ring", p. 175 (1970)
Maps:
U.S.G.S, topographic map 1:24,000 Scale 1 In.= 2000 ft.*
Geologic Mep of C'llfornla: San Jose and San Francfsco sheets 1 :250,000
*Castle Rock Ridge U.S.G.S. quadrangle 1:24000 (1968)
Geologic ma~ of the Sargent-Berrocal fault zone .,.CA: Sorg, Den!lfts H., and McLaughlin, .Robt. J., 1:24,000, u.s.G.S. m.a.p MF-643 ( 1975)
Setsmlcity
Plates -- Data
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0
EXPLANATION
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UAJOR ~AULT ZONES Tt~SITE 011" MODEF!N ·'TE:C:'TONIC C.R!:EP
AFF!e'flNG MAl\l•f>A.AtJ~ STRUCTURES
GL.sGEO'OINETER L.INE C:~O!i!>1Nt;i. ~,&l)LT ZONE
E.G.ATHQUAKE EPICENTERS
P~t. 1'930 19~0 TQ l'!llftT fdot• liiffd IPIO~nllud# of mli•t 1,,.,,.-tMt •orthq~o••• ~ha~~I
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Mineral Information Service CA
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C1'LIFORNL\ DmsIO:< OF MtNES -'"" GEOLOGY Bull 198
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: m i ' ' Preliminary Map of
MAXIMUM EXPECTABLE EAFm!QUAKE INTENSITY D. , All1,1r0$ 8 !
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APPENDIX B
General Comparison of Scale5 Used to Rate Earthquakes at the Earthquake Epicenter*
In.tensity
Magr1it• Modified )41!.r(:&l.li lWSsi ~ron1' Richter Seal~ $C~ll!! ~uivalent
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Total de~truction wet!tk :1t't'Ui=:turee, ~(lttSiderallle d.ma.g!J Wll!!ll-lliuilt. liiltru.ct.\U'ell
MMOfU.j" and. froie st:ructur~s 0011111only destroyed. Only best. bu.ild.ings surrlv.
DeliC~~ly SUB~~ cbjecu ~ift9
c ... t:$ rocked, vi~ 1;at.t.led
Dishes , vi.;'idcw11 bnik.i pe11d11ium clock$ If~
ruxr.iitura l!KiV.4, d>jact.w upset:
Mcm"UtDel".l.t8 ~ walls d.a.m. f11~i t\lre Oftl'
tlll'l'led. sand~
rn11d eject.d. Ch~• in well-Wiit.tet" leveh
Po\'lnd.at.iorui d~4. u,r':der~gro'QI'l"- pi.pa brok•n.
Cro1J.~ b~dly cracked, rails bent. Wat.er • J.opr-ed. uve:c- b~
Bt'Ood .fis&uns r f'anl'•eazpa. Un~ic-g:rcm.4
pips.a (JUt of ••nioti
Ac~lmrat.ion ·~~ gr&vity. Wa~• seen in r;rx-ol,ltJ.ii. I.in9t. of: sight. and. i..v.1 distort~, cbjecu th.niwa. in ah
Nor.Et ~it~ an.d. :ln.ten.111.t:y ot an earthquakll!! are enti~ly diff•Rnt 111111e.u.urmnsnU of ·~· ~ m- •!feet:.,. &t"J.d it=an only ti• eon::pareQ •t. the e,.uthi;ru~• 1tpit::enut-~
""'~it:ud!!! - i11 • n.U!B::ier d4il:"t~d. tram in,1;t~ntal il'lllM1,1~.mente, and. is the. mau~ l)f th.ii! enarqt 1=*leu.d. by t.he eartb~e.. There i~ ~e Ma.snitl,113..e cal.cul.ated for each eatthqllak.11!!1.
Int.P.naltv - i• a local i:.o:t.in.9 of e.i.....'""thqu.!ko!; effecb Qb:sll!rved and. ~ported by pW.Op).lft at any ¢ven loe.t.iOll .. lnten.~:i.t~ r111.tir'l.i;i:s f¢~ one e~~l.Lake va.ey c~i~rably d~p.:cnding on di:s~~O!; f:com • .,tcentl!i=, th• ti4.tlll9 of th~ 6oil and. ~ beneatl", thll!! d:Jeervert oWl4 thei Qb:111•~:i-'s ~nt.sq:iRt.o.t.i".l'n of •~D~ Sll!en or felt...
36
IN9;"rRUMENT9.
A NE\J\/, IMPORTANT ADVANCEMENT IN SUBSURFACE EARTH INVESTIGATION
fE HDRIZONTAl. range and deptll capability wilhoul e~lostvet It doubled.
The depth capability of engineering seismographs has been dramatically increased by the usa of SISON Signal Enhancement concept by which seismic waves from impact sources are stored and summed. The summation from repeated impacts
FIRST IMPACT
Here is the Signal Enhancement technique In action. It adds together signals from repeated impacts. The true signals always arrive at the same time and add directly, whereas earth movement noise generated by vehicles, mining or drilling ma~ chine'3, high ten$ion 11.tires ot wind, arrive at random tirnes <:tnd tend to cancel out. The complete waveform is displayed permanently until erased. The Vertical Marker is positioned at the dcsirGd point on the waveform to g~ve the digital t:me resJ"Jing in milliseconds.
lJSED IN 1-!lqhwRy Ro11t~ St>h.~.ctioi;." P1r··1:i!'./'1<?. Rou!(l
,''·'
brings small signals up out. of the background noiae. Tt1e onhancement feature combined with continuous display of the waveform and digital readout of travel times opens new fields of applications.
)' ;.~· . .'.,·:·.,,; .. ~:..;.,, ..... ·. -.... ··
~,·····:~A·~:~'~·--· .. , . ..:..~>, ,,.1·>;.~ ,·,...,. "':'("'"""'"
Selection. Bidding and Estimoting. Water Well Location. Foundatiorl Studies. Darnsite Investigation$. Minin9 Investigations. Geological Studies. Gravel and Rock Prospecting. Water Supply. Sanitary Landfill Evaluotion. Slope Design. Landslide Investigation.
ALLIED GEOPHYSICS p_o_ EJox !$83 ,cl;,111,1'>.1 .,10'.';E, CA. 9!U06
PRil'!ERA CONVE::CION INl'.i::RAMERICANA DE RECURSOS MI~l!RALES - 1951 Institute of Mineral Kesources of Mexico
Jurrorican Institute of Mining and Metallurgical t:ngineers Panam.erican Institute of Mining Engineers and Geologists
MINIATlffiE SEISMIC REFRACTION MAPFING IN MINING AND CIVIL EIDII1El1llli'G
R. BURTON ROSE X
Abstract
A restlr.lo of a very lightweight, portable multi-channel seismic refraction instrument design XX and its import in the field:> o:r mining and civil engineering studies. This compactness and portability permits ap.!Jlication in many shallow geologic, f'oundation, ground water ar:.d placer problems previously either too inaccessible o~ too lir::ited in scope for large scale seismic study.
P1•aotical f&.c: to1·u in. such remote aEu/ or shurt period applications depend on (a) lightnoss of' oo.o.plete s ei>Jroograph uriit, totalling about 100 !JCLcn::l.s; ( b) :i.ro.rn.ediate fiold exanination of tha photographic recO':'ds; ( o) specialized geophy:3 icul personnel can be lim.i.ted to one '.'.lperator-intorprotor; ( d) q uic;; f'iold layout changes and survey progress; ( e) i·oduotion of total nun1ber of' test dril.l. holes, or elim.ination on reccn:naissance basis; ( f') cost compar:ison
. ·t;o test drillinr, approx:i.nntins 10 percent; <rnd (g) ;~j_nimal basic invostrnont or s urv0y overhead coi;ts. Depth peI:te crati_o;~ approximates
,,..., . one-third the lengtil from shot point to far recorder, extend.able to v·- any maximum depth required. Illustration exo.moles represent typical instances of field
problems and re-'lults. •
LEV.l\NTAMIEIITOS DE HE.l!'R.'\CCION SEISMICA EN UINIJiTV''Rfl EN LA INGEIJr.t:Rii1 MIHE;H.A Y CIVIL
R. BURTON ROSE X
Abstracto
Un resllr,ien sobro un instrwnento rot.:y livia.no, portatil, de multi-canales p;~ra ref:i.0 aooi6n seis!tica y su inportancia en los campos de estudio de :i.ngenieria roinera y civil.
J,o compacto y port1til deJ_ aparato permite Stl aplica(lion · en n;iuchos s i tics con problorua geologioo por el esca::rn fondo d<3l ci.ciiento, por cgua on el tcrreno o pol.' obstticltlos en los placE•:t·es qu"' anteriorrar~nte fueron, o t.il!Y ina::::cenible:J o muy 11mita&os on extensi6n para un 0stlldio se.ismico e!l gran e:3oala.
Ln penotrac:l.6!1 pro.funda aproxima un tercio l.a <listancia del punt~o de cxplo:Ji6n a1 rcg:i.stro a d.istancia, qua es ext•3nsible a cualc1uier profu.Dlidad. quo se .req_ui0t·a •
..J :..;: Geoloeist-r,eophys 5_cist, Box 583, Sun Jo!;o, Calii'orni_a, U .s .A. ~
?a.tents are pe;::ding - Cent;11ry (;c;,:i:ihysical coi·poration.