![Page 1: Compact Seafloor Cabled Seismic and Tsunami Observation ...Compact Seafloor Cabled Seismic and Tsunami Observation System Enhanced by Information and Communication Technology Masanao](https://reader031.vdocuments.mx/reader031/viewer/2022013021/5f07eb527e708231d41f6aa4/html5/thumbnails/1.jpg)
Compact Seafloor Cabled Seismic and Tsunami Observation System Enhanced by
Information and Communication Technology
Masanao SHINOHARA1, Tomoaki YAMADA1, Shin’ichi SAKAI1, Hajime Shiobara1, and Toshihiko KANAZAWA2
1 Earthquake Research Institute, the University of Tokyo 2 National Research Institute for Earth Science and Disaster Prevention
CTBTO Science and Technology Conference 2015 T3.1 Design of Sensor Systems
KLEINER REDOUTENSAAL 14:15-14:30 June 23, 2015
![Page 2: Compact Seafloor Cabled Seismic and Tsunami Observation ...Compact Seafloor Cabled Seismic and Tsunami Observation System Enhanced by Information and Communication Technology Masanao](https://reader031.vdocuments.mx/reader031/viewer/2022013021/5f07eb527e708231d41f6aa4/html5/thumbnails/2.jpg)
Seafloor seismic tsunami observation system using optical cable off Sanriku, Japan
TM2 TM1
2 Fujii et al., 2011
n 3 seismometers and 2 tsunami gauges n Installed in 1996 n Total length is 120km n Data transmission: tele-communication
technology (ITU-T G.704) n The data contributes to estimate source
region of the tsunami n The landing station was rebuilt
Time
OBS3 OBS2 OBS1
TM2 TM1
[m]
![Page 3: Compact Seafloor Cabled Seismic and Tsunami Observation ...Compact Seafloor Cabled Seismic and Tsunami Observation System Enhanced by Information and Communication Technology Masanao](https://reader031.vdocuments.mx/reader031/viewer/2022013021/5f07eb527e708231d41f6aa4/html5/thumbnails/3.jpg)
Seismometer + Tsunami-meter
Concept of new OBCST - larger coverage, higher density, more flexible -
n Inline system for cost and rapid deployment n Downsizing and technology for wide use with high reliability n Software based system for flexibility of system
3
Seismometer + external port S-NET
n Coverage of wide area n Spatial higher density n expandable, maintenance
DONET
n Backbone cable uses traditional technology
n Extension by external port n Expansion of cable by ROV
n Traditional system with high reliability
n Large coverage by inline system
New system
n Lower cost for total system n Large number of observation node n external port and flexibility
ICT and up-to-date electronics
![Page 4: Compact Seafloor Cabled Seismic and Tsunami Observation ...Compact Seafloor Cabled Seismic and Tsunami Observation System Enhanced by Information and Communication Technology Masanao](https://reader031.vdocuments.mx/reader031/viewer/2022013021/5f07eb527e708231d41f6aa4/html5/thumbnails/4.jpg)
4
First generation OBCS system in the Japan Sea
Landing station
Cabled Seismometer (CS)
Installed on Aug. 2010 Power supply Master clock Data recording
Cabled seismometer 4 Interval 5 km, Landing 1
Internal unit of CS
The system is buried 1 m below seafloor at depth greater than 20 m
Data are sent to ERI
n ICT is used. Low-cost and high-reliability n Down-sizing and low-power consumption of CS
by up-to-date electronics (e.g. FPGA)
Continuous recording for 5 years
![Page 5: Compact Seafloor Cabled Seismic and Tsunami Observation ...Compact Seafloor Cabled Seismic and Tsunami Observation System Enhanced by Information and Communication Technology Masanao](https://reader031.vdocuments.mx/reader031/viewer/2022013021/5f07eb527e708231d41f6aa4/html5/thumbnails/5.jpg)
The second cabled system off Sanriku
5
n IP system (Second generation of our system) Low-cost, high reliability system using TCP/IP and in-line system
n 3-C seismometer and pressure gauge/PoE port for a node n 3 nodes, total length is 105 km n Landing station for existing system is available
Existing cable
Specifications Max depth:6,000 m Data transfer speed:1Gbps (IEEE802.3z) Timing accuracy:0.1 ms 1 landing Supply voltage:250 V, current 0.8 A Sensors:JA-5 type III, 8B7000-2
![Page 6: Compact Seafloor Cabled Seismic and Tsunami Observation ...Compact Seafloor Cabled Seismic and Tsunami Observation System Enhanced by Information and Communication Technology Masanao](https://reader031.vdocuments.mx/reader031/viewer/2022013021/5f07eb527e708231d41f6aa4/html5/thumbnails/6.jpg)
6
Network configuration for new Sanriku OBCST
Duplicate for clock line Improvement of reliability and cost performance
Route turn
PoE Interface TCP/IP I/F, 10Mbps:Supplying power 12W Connection of broadband seismometer, pressure gauge, etc.
![Page 7: Compact Seafloor Cabled Seismic and Tsunami Observation ...Compact Seafloor Cabled Seismic and Tsunami Observation System Enhanced by Information and Communication Technology Masanao](https://reader031.vdocuments.mx/reader031/viewer/2022013021/5f07eb527e708231d41f6aa4/html5/thumbnails/7.jpg)
7
System development for new Sanriku OBCST Sensors for observation l 3-C accelerometer
(equipped on all nodes) l Precise pressure
gauges(Buried nodes) l External sensor via PoE
port (various type sensor)
Based on the first system n Microprocessor control n Integration with FPGA
• GigaBit Ethernet Increase amount of data • WDM Decrease of fiber number • IEEE1588 Precise timing through Ethernet • Atomic clock Stand-alone precise timing
n Pressure gauge Tsunami, crustal movement n PoE port by UMC Replace of sensor by ROV
SFP
SFP
SFP
SFP
SFP
SFP
FPGA
Atomic Clock
A/D I/F
PLL PLL
CPU
RAM
RAM RAM
ROM
ADC
I/F
Power Reg.
![Page 8: Compact Seafloor Cabled Seismic and Tsunami Observation ...Compact Seafloor Cabled Seismic and Tsunami Observation System Enhanced by Information and Communication Technology Masanao](https://reader031.vdocuments.mx/reader031/viewer/2022013021/5f07eb527e708231d41f6aa4/html5/thumbnails/8.jpg)
Layout of electronics unit for new Sanriku OBCST
8
![Page 9: Compact Seafloor Cabled Seismic and Tsunami Observation ...Compact Seafloor Cabled Seismic and Tsunami Observation System Enhanced by Information and Communication Technology Masanao](https://reader031.vdocuments.mx/reader031/viewer/2022013021/5f07eb527e708231d41f6aa4/html5/thumbnails/9.jpg)
9
Performance of system
Pressure gauge
Electronics unit including seismometers
JAE JA-5TypeIII Paroscientific 8B7000-2-005
Optical fiber
Node0
Node1
To evaluate a performance of electronics unit, seismic observations by using proto-type was performed in April, 2013
Clock on land
400ns
Clock on a node
Installed at a vault with depth of 100 m in Nokogiri-yama geophysical observatory, ERI
Time synchronization with accuracy of 300 ns through Ethernet
![Page 10: Compact Seafloor Cabled Seismic and Tsunami Observation ...Compact Seafloor Cabled Seismic and Tsunami Observation System Enhanced by Information and Communication Technology Masanao](https://reader031.vdocuments.mx/reader031/viewer/2022013021/5f07eb527e708231d41f6aa4/html5/thumbnails/10.jpg)
10
Practical system
Pressure gauge
Electronics unit including seismometers
Fiber
Node0
Node2(PoE)
Power
Landing system
Records of pressure gauge
2014-04-09 00:02 Off Ibaraki Depth=58km M 4.6 D~200km
n Electronics units are improved from the results of evaluation of proto-type.
n PoE is implemented
Node2 (4-8Hz)
Electronics units for deployment are under evaluation from April 2014
![Page 11: Compact Seafloor Cabled Seismic and Tsunami Observation ...Compact Seafloor Cabled Seismic and Tsunami Observation System Enhanced by Information and Communication Technology Masanao](https://reader031.vdocuments.mx/reader031/viewer/2022013021/5f07eb527e708231d41f6aa4/html5/thumbnails/11.jpg)
11
External devices through PoE
Electronics unit has PoE function
n TCP/IP interface(10Mbps) n Power of about 12W can be supplied. n After deployment system, additional sensor
can be attached by using UMC n Cable system functions for ethernet line.
Example (pressure gauge) n For a test, p. gauge with digital output is connected.
n P. gauge seems to connect a server directly on landing
![Page 12: Compact Seafloor Cabled Seismic and Tsunami Observation ...Compact Seafloor Cabled Seismic and Tsunami Observation System Enhanced by Information and Communication Technology Masanao](https://reader031.vdocuments.mx/reader031/viewer/2022013021/5f07eb527e708231d41f6aa4/html5/thumbnails/12.jpg)
Pressure canister for new Sanriku OBCST
12
Pressure gauge Electronics unit
c.a. 1300
c.a. 4800 c.a.1300 Φ265
Pressure canister for observation node • Use of existing canister • Optimal heat-radiation • Enclosing by welding • Feed-through • Mount of pressure gauge or UMC
UMC (PoE port)
Electronics unit
Pressure gauge
![Page 13: Compact Seafloor Cabled Seismic and Tsunami Observation ...Compact Seafloor Cabled Seismic and Tsunami Observation System Enhanced by Information and Communication Technology Masanao](https://reader031.vdocuments.mx/reader031/viewer/2022013021/5f07eb527e708231d41f6aa4/html5/thumbnails/13.jpg)
Production and installation
13
October, 2014 n Completion of production of three
observation node. March, 2015 n The observation nodes were connected
with seafloor optical fiber cable September, 2015 (Plan) n System deployment
Seafloor survey for cable route had been carried out in August, 2013.
![Page 14: Compact Seafloor Cabled Seismic and Tsunami Observation ...Compact Seafloor Cabled Seismic and Tsunami Observation System Enhanced by Information and Communication Technology Masanao](https://reader031.vdocuments.mx/reader031/viewer/2022013021/5f07eb527e708231d41f6aa4/html5/thumbnails/14.jpg)
14
Cabled seismometers
![Page 15: Compact Seafloor Cabled Seismic and Tsunami Observation ...Compact Seafloor Cabled Seismic and Tsunami Observation System Enhanced by Information and Communication Technology Masanao](https://reader031.vdocuments.mx/reader031/viewer/2022013021/5f07eb527e708231d41f6aa4/html5/thumbnails/15.jpg)
15
Summary n Compact OBCS using ICT has been developed for monitoring of
seismic activities and tsunami.
n First installation of the ICT system was performed in the Japan Sea in 2010.
n The observation continues for 5 years.
n Sanriku system deployed in 1996 caught the 2011 huge tsunami 15-20 minutes before it reached the coastline.
n A second ICT system based on the first ICT system is installing in this September close to the 1996 system.
n Each node has a seismometer. Two nodes equips with a pressure gauge, and the other has a PoE external port.
n The system has 1Gbps Ethernet, and IEEE1588 for timing. n The system is ready.