Seismograph Networks in Seismograph Networks in China: China: Present State and Present State and Development Program Development Program Yun-tai Chen, Gong-wei Zhou and Rui-feng Liu Yun-tai Chen, Gong-wei Zhou and Rui-feng Liu Institute of Geophysics Institute of Geophysics China Earthquake Administration China Earthquake Administration Beijing 100081, China Beijing 100081, China [email protected]August 24, 2005 Washington DC August 24, 2005 Washington DC
Transcript
Seismograph Networks in China:Seismograph Networks in China:Present State and Present State and
Development ProgramDevelopment Program
Yun-tai Chen, Gong-wei Zhou and Rui-feng LiuYun-tai Chen, Gong-wei Zhou and Rui-feng Liu
Institute of GeophysicsInstitute of GeophysicsChina Earthquake AdministrationChina Earthquake Administration
China Digital Seismograph Network China Digital Seismograph Network
(CDSN)(CDSN)
• Sino-US cooperative Sino-US cooperative
• Designed in 1983 Designed in 1983
• Started operation in 1986 Started operation in 1986
• Upgraded in1993 to 2001Upgraded in1993 to 2001
• A main partner of GSNA main partner of GSN
China Digital Seismograph Network
A national projectA national project
Launched by CEA for updating the seismologicalLaunched by CEA for updating the seismological
observation facilities into digital seismological observation facilities into digital seismological
observation systems observation systems
Supported by the central government and localSupported by the central government and local
governments governments
China Digital Seismological China Digital Seismological Observation System (CDSOS)Observation System (CDSOS)
(1996-2000)(1996-2000)
China Digital Seismological China Digital Seismological
Observation System (CDSOS)Observation System (CDSOS) National Digital Seismograph Network (NDSN)
48 real-time digital seismic stations through satellite links
28 auxiliary stations by CD
Regional Digital Seismograph Network (RDSN)
Regional Telemetered Digital Seismograph Networks (RTDSN)
20 Networks with 267 stations
Telemetered Digital Seismograph Network in Capital region:
107 stations
Portable Digital Seismograph Network (PDSN)
100 portable stations
National Digital Seismograph Network (NDSN)National Digital Seismograph Network (NDSN)(48 real-time stations)(48 real-time stations)
Legend
National Digital Seismograph Network (NDSN)(28 auxiliary stations)
Regional Digital Seismograph Network (RDSN)Regional Digital Seismograph Network (RDSN)(20 networks with 267 stations)(20 networks with 267 stations)
LegendNetwork centerTelemetered station
Telemetered Digital Seismograph NetworkTelemetered Digital Seismograph Network in Capital Region in Capital Region (107 stations)(107 stations)
Beijing
Tianjin
Hebei
The Monitoring Capability of The Monitoring Capability of Digital Seismic Telemetered Stations in Capital RegionDigital Seismic Telemetered Stations in Capital Region
VBBBBBorehole
Solidl: w. SM
Instruments
National Digital Seismograph Network (NDSN)National Digital Seismograph Network (NDSN)
JCZ-1: flat velocity response from 360 s to 20 Hz, sampling rate: 50 sps
CTS-1: flat velocity response from 120 s to 20 Hz, sampling rate: 50 sps
STS-1: flat velocity response from 360 s to 8.5 Hz , sampling rate: 20 sps
Regional Telemetered Digital Seismograph Networks (RTDSN)Regional Telemetered Digital Seismograph Networks (RTDSN)
FBS-3: flat velocity response from 20 s to 20 Hz, sampling rate: 50 sps
FSS-3: flat velocity response from 1s to 20 Hz, sampling rate: 50 sps
Portable Digital Seismograph StationsPortable Digital Seismograph Stations FSS-3: flat velocity response from 1s to 20 Hz, sampling rate: 50 sps
China Digital Seismological Observation SystemChina Digital Seismological Observation System(by the end of 2005)(by the end of 2005)
National Digital Seismograph Network (NDSN)National Digital Seismograph Network (NDSN)
Real-time digital seismic stations through satellite links: 152 stations (now 48)
Regional Telemetered Digital Seismograph Networks Regional Telemetered Digital Seismograph Networks (RTDSN)(RTDSN)
31 Networks (now 20) with 678 stations (now 267)
Portable Digital Seismograph StationsPortable Digital Seismograph Stations
800 stations (now 100)
National Digital Seismograph Network (152 stations by the end of 2005)(152 stations by the end of 2005)
To be installedExisting
Legend
Regional Digital Seismograph NetworkRegional Digital Seismograph Network (678 stations by the end of 2005) (678 stations by the end of 2005)
Development ProgramDevelopment Program (2006-2020)(2006-2020)
For studies of global seismicity (72 stations)For studies of global seismicity (72 stations)
24 existing stations24 existing stations
7 stations by the end of 20057 stations by the end of 2005
41 stations will be established in 2006-2020. 41 stations will be established in 2006-2020.
200 stations and 5 seismic arrays with spacing betwe200 stations and 5 seismic arrays with spacing between stations of 200-250km. en stations of 200-250km.
by the end of 2005: 150 stations and 2 arrays by the end of 2005: 150 stations and 2 arrays
In Tibetan PlateauIn Tibetan Plateau, the spacing between the stations , the spacing between the stations will be about 400km.will be about 400km.
Development ProgramDevelopment Program (2006-2020)(2006-2020)
Regional telemetered digital seismograph networksRegional telemetered digital seismograph networks
In the most densely populated and/or earthquake-In the most densely populated and/or earthquake-prone areas of China will be greatly intensified. prone areas of China will be greatly intensified.
Existing: 785 (678+107) regional stationsExisting: 785 (678+107) regional stations By the end of 2005:1000 regional stationsBy the end of 2005:1000 regional stations 2006-2020 : 1689 regional stations 2006-2020 : 1689 regional stations
Spacing between stations: about 10km Spacing between stations: about 10km
Development ProgramDevelopment Program (2006-2020)(2006-2020)
Monitoring seismicity associated with mining Monitoring seismicity associated with mining
activity, reservoir, nuclear power plant, oil-field, activity, reservoir, nuclear power plant, oil-field, etc.etc.
Denser spaced seismograph networks sponsored and Denser spaced seismograph networks sponsored and operated by industrial agencies are considered to be operated by industrial agencies are considered to be important supplements to the NDSN and to the regional important supplements to the NDSN and to the regional telemetered digital seismograph networks. telemetered digital seismograph networks.
