1. Introduction to the Broadband Array in Taiwan for Seismology (BATS) Wen-Tzong Liang* Chun-Chi Liu Bor-Shouh Huang Institute of Earth Sciences, Academia Sinica, Taiwan Waveform Data Management Workshop 21-26 Oct, 2007

2. Overview Taiwan Tectonics Broadband Array in Taiwan for Seismology Network Operation Portable Units Future Plans

3. Taiwan Tectonics Pacific Plate Eurasia Plate Taiwan China Japan Australia Philippine Philippine Sea plate Taiwan is located in the Western Pacific region between Japan and Philippine to the east of mainland China. Tectonically, Taiwan is located on the convergent plate boundary zone between the Eurasian Plate and the Philippine Sea Plate.

4. Taiwan Tectonic Setting Manila Trench South China Sea CWB M L  3.5 Kuo, 2003 IES DMC 80 mm/y r

5. Taiwan Seismicity MLML No. of Earthquakes Oct. 1996 – Sep. 2006 Mc ~ 2.5 Data Source: IES& CWB > 30 (M L >2.5)/day

6. TEC Station Information System

7. Broadband Array in Taiwan for Seismology (BATS) IES Project was initiated by the IES in 1992 Started constructing its first station in 1994 Routinely inverting CMT solutions since 1996 Join FDSN as a member network (open data) An organized BATS DC established in 2001 CWB CWB added BB stations since late 2001 53 BB stations operated by IES/CWB in 2007

8. BATS Stations 1 GSN station (TATO)  KS 5400i BATS/IES: 21  STS2/STS1/Trillium240 BATS/CWB: 32  Guralp 3ESP/40T/3T 54 Permanent BB Stations in the Taiwan Region

9. Instrumentation BATS-IES STS1/ STS2 /CMG3TB/ Trillium 240 EpiSensor Q680/ Q4120/ Q330/ Q330HR Frame Relay/ Microwave/ Satellite BATS-CWB CMG3ESP/ CMG40T/ CMG3T EpiSensor Frame Relay/ Satellite transmission

10. Station Condition TDCB Techi YULB Yuli NACB Taroko STS-1 STS-2 marble schist slate STS-2

11. BATS Stations High seismicity in the offshore region of eastern and southern Taiwan, where is seriously lacking station coverage The only way to enlarge the array aperture is to deploy OBS or to exchange data with various operating agents

12. Real-Time Data Exchange NIED  10-minutes mseed files (file-based)  seedlink data streams (packet-based)  4 F-Net stations 2 BATS stations IRIS  orb2orb data streams  Data of 7 BATS stations is accessible to public through IRIS facilities in a real-time manner

13. BATS + F-Net Stations

14. Data Acquisition Systems Real-time operation Earthworm System IES/CWB  2001 IES/CWB  USGS Software/ ISTI Antelope System IES  2006 IES  Commercial Package/ BRTT

15. Earthworm System

16. Antelope System

17. Portable Seismic Arrays/ IES 1998-1999 Tarim, China 2000-2004 Taiwan 2004-2005 Tibet, China 2005~ Vietnam 2007~ Georgia STS-2/ Trillium Broadband Sensors Reftek/ Q330 24-bit Digitizers

18. Portable Seismic Arrays/BATS Georgia 2007~ Hi-CLIMB 2004-2005 Tarim 1998-1999 Northern Vietnam 2005~ TAIGER 2006~ STTA 2005~

19. IES Broadband OBS Experiment The 1st deployment of BB OBS experiment in the eastern offshore region Kuo and Chi, Sep. 2006 http://obs.earth.sinica.edu.tw

20. BATS Web Services http://bats.earth.sinica.edu.tw Regional Quick CMT ReportWaveform Viewing and Download

21. BATS CMT Solutions

22. Seismotectonic Patterns Kao and Jian, 2001 Regional and local seismotectonic patterns

23. New Challenges to BATS Ambient noise reduction – borehole stations Expanding array aperture to obtain higher resolution of deep structures Extending observable frequency band of signals Providing better web services to the community

24. New Observations of BATS Low-Gain Sensors (Velocity type Accelerometer) Borehole Strainmeters (Dynamic Strain) High Sampling Rate Continuous GPS (Horizontal) Superconducting Gravimeter (Vertical) Magnetotelluric (Electromagnetic properties)

25. Future Plans On-line BATS event waveform database Collaborated with the ASCC/ ASGC for modern IT applications Toward integrated geophysical observatories Seeking for international collaboration on data exchange and tectonic studies Contributing to Pacific-Asia Risk Mitigation

26. Thank you!