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

Overview

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

Taiwan Tectonics

Pacific Plate

Eurasia Plate

TaiwanTaiwan

ChinaChina JapanJapan

Australia

PhilippinePhilippine

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.

Taiwan Tectonic Setting

Manila T

rench

South China

Sea

CWB ML 3.5

Kuo, 2003 IES DMC

80 80 mm/ymm/y

rr

Taiwan Seismicity

ML

No.

of

Ear

thqu

akes

Oct. 1996 – Sep. 2006 Mc ~ 2.5 Data Source: IES& CWB > 30 (ML>2.5)/day

TEC Station Information System

Broadband Array in Taiwan for Seismology (BATS) Project was initiated by the IESIES 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 CWBCWB added BB stations since late 2001 53 BB stations operated by IES/CWB in 2007

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

Instrumentation

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

Station Condition

TDCB

Techi

YULB

Yuli

NACB

Taroko

STS-1

STS-2

marble

schist

slate

STS-2

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

Real-Time Data Exchange

NIED10-minutes mseed files (file-based)seedlink data streams (packet-based)4 F-Net stations 2 BATS stations

IRISorb2orb data streamsData of 7 BATS stations is accessible to publi

c through IRIS facilities in a real-time manner

BATS + F-Net Stations

Data Acquisition Systems

Real-time operation Earthworm System

2001 IES/CWBIES/CWBUSGS Software/ ISTI

Antelope System2006 IESIESCommercial Package/ BRTT

Earthworm System

Antelope System

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

Portable Seismic Arrays/BATS

Georgia 2007~

Hi-CLIMB 2004-2005

Tarim 1998-1999

Northern Vietnam 2005~

TAIGER 2006~

STTA 2005~

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

BATS Web Services http://bats.earth.sinica.edu.tw

Regional Quick CMT Report Waveform Viewing and Download

BATS CMT Solutions

Seismotectonic Patterns

Kao and Jian, 2001

Regional and local seismotectonic patterns

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

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)

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

Thank you!