Seismic Networks Operated by Central Weather Bureau in Taiwan Ta-Yi Chen Central Weather Bureau

Outline Seismicity in Taiwan CWB Seismic Networks Integrated Seismic Network System Architecture Data Format

Seismicity in Taiwan Magnitude RangeAverage (Numbers/Year) 7 ≦ M L ≦ M L ＜ ≦ M L ＜ ≦ M L ＜ ≦ M L 19,175

Current Seismic Networks （ since 1991 ） Strong-Motion Seismic Network (110) Dynamic Range : 16bit Sampling Rate : 50sps Type of Seismometer: Smart24a Type of telemetry : Telephone Line Time mark is given in Central Station. Short-Period Seismic Network (71) Dynamic Range : 12bit Sampling Rate : 100sps Type of Seismometer: S13 Type of telemetry : Telephone Line Time mark is given in Central Station. S13 in Bore-Hole S13 on SurfaceSmart24a on Surface

Updated Seismic Network 68 station done Integrate short-period and strong-motion data streams into 1 recorder (Smart24a). Dynamic Range : 24bit Sampling Rate : 100sps Type of Telemetry : Frame Relay, ADSL Time mark is given on site by GPS.

Broad-Band Seismic Network Broad-Band Seismic Network (33) Dynamic Range : 24bit Sampling Rate : 100sps Type of Seismometer: CMG-3ESP, CMG-40TD Type of Digitizer: DM24 Type of telemetry : Frame Relay Time mark is given on site by GPS. CMG-3ESP DM24

Bore-Hole Seismic Network Done Phase II Phase III Dynamic Range : 24bit Sampling Rate : 100sps Type of Telemetry : Frame Relay Type of Digitizer: Smart24r Time mark is given on site by GPS. Each site is equipped with 3 different instruments ~300 m in depth 17 stations Have Been Done 70 stations in Final Step

Cable Ocean Bottom Seismic Network Latitude Longitude Sea Depth Meter Land Station Observed Node achievedBlack line: achieved in 2011 ongoingBlue line: ongoing project as the phase II plannedWhite line: planned project as phase III Dynamic Range : 24bit Sampling Rate : 100sps Type of Telemetry : Frame Relay Time mark is given on site.

Central Weather Bureau, Taiwan Updated Seismic Networks Bore-Hole Seismic Network Cable Ocean Bottom Seismic Network Institute of Earth Sciences, Academia Sinica, Taiwan Broadband Array in Taiwan for Seismology (BATS) Yangmingshan (YMS) Volcano Seismic Network Other Institutions Incorporated Research Institutions for Seismology (IRIS) : 3 JMA (Japan) Stations Integration for all CWB Seismic Networks

S tation C hannel Network L ocation Network (Network Type) CWB_BHCWB Bore Hole CWB_BBCWB Broad Band CWB_SMTCWB Smart24 IRIS_JPNIRIS Japan IES_YMSIES YMS IES_BATSIES BATS Channel (Instrument Type) Ch1~Ch3 Strong Motion (Z ， N ， E) Ch4~Ch6 Short Period (Z ， N ， E) Ch7~Ch9 Broad Band (Z ， N ， E) Location (Position of Instrument) 01Surface 02Bore Hole 03Ocean Bottom Policy of SCNL

測站 StationChannelNetworkLocation Acceleration of Smart24CHKCh1~Ch3CWB_SMT01 Short Period of Smart24CHKCh4~Ch6CWB_SMT01 Broad Band in SurfaceCHKCh7~Ch9CWB_BB01 Broad Band in Bore HoleCHKCh7~Ch9CWB_BB02 Example: Cheng Kung Station

Integrated Seismic Network The Earthworm system is used for integrating seismic networks. Operators are able to request different kinds of real-time data from this Earthworm system. Total 144 Sites 249 Instruments

module Receiving Layer Integrated Layer Application Layer Earthworm Data Exchange TCP/IP Earthworm Smart24aBHBBOBSOthers System Architecture Earthquake Rapid Report Earthquake Early Warning Tsunami Early Warning Fault Plane Solutions Earthquake Catalog

File Header Port Header Data (4 bytes for 24 bits data) (Component, Port, Points) ContentData Type 1System ID4 bytes char 2Year2 bytes int 3Milli-second2 bytes int 4File length (sec) 2 bytes int 5Month1 byte int 6Day1 byte int 7Hour1 byte int 8Minute1 byte int 9Second1 byte int 10Sample Rate1 byte unsigned int 11Number of Port 2 bytes int 12Null (Empty)6 bytes int ContentData Type 1Station4 bytes charTAP1, HWA,CHN5, …… 2Instrument4 bytes char FBA, SP, BB 3Component Order 3 bytes charVNE 4GPS status1 byte int 0 ： unlock, 1 ： lock, 2 ： unknown, 3 ： data lost 5Null (Empty)2 bytes intUn-used 6Number of Comp1 byte int3 7Location1 byte int 1 ： Surface, 2 ： Borehole, 3 ： Ocean Bottom 8Net Name4 bytes char 9Null (Empty)12 bytes intUn-used Port Header (32 Bytes each port) File Header (24 bytes) CWB24 Format

GPS Status CHY

Integrated CWB Seismic Network IES-YMS Acceleration Short Period Acceleration IRIS-JPN Short Period Broad Band IES-BATS Bore Hole

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