Microearthquake monitoring of the Shanchiao fault in northern Taiwan
Abstract
The Shanchiao fault is the major active fault in northern Taiwan. The normal faulting caused the Taipei Basin and is the largest potential seismic threat to the Taipei metropolitan area. In this study, a real-time microearthquake monitoring network was set up with thirteen broadband seismometers to observe continuously the seismicity of the Shanchiao fault. Besides, additional thirty-five stations operated by the other three organizations are integrated with our monitoring. The integrated monitoring data will provide valuable information about recent seismicity and the source parameters, which are indispensable in assessing the seismic potential of the Shanchiao fault. Almost 2000 microearthquakes were located in the monitoring region until now. Most of the epicenters concentrate on the Tatun volcano region, which is a dormant volcano at the east of Shanchiao fault. The focal depths are mostly within 5 km. Several earthquake clusters happened in this region were identified. To reduce location errors, the double-difference earthquake location algorithm (HypoDD) was used to relocate the earthquakes observed by the network. The focal mechanisms for some events were computed from P-wave first motion polarities. Although the involving of the Tatun volcano make it hard to clarify the seismicity of the Shanchiao fault, the probable seismogenic structures and source ruptures will be evaluated by long-term monitoring in the future.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2017
- Bibcode:
- 2017AGUFM.T41C0639L
- Keywords:
-
- 1207 Transient deformation;
- GEODESY AND GRAVITY;
- 1209 Tectonic deformation;
- GEODESY AND GRAVITY;
- 7223 Earthquake interaction;
- forecasting;
- and prediction;
- SEISMOLOGY;
- 8158 Plate motions: present and recent;
- TECTONOPHYSICS