Abstract
The Taipei basin, historically low in seismicity, is located in northern Taiwan. A dense broadband seismic array was deployed in the basin in June 2004 to monitor seismic activity. During the period of operation, three felt earthquakes occurred near the eastern part of the Taipei basin, about 3 km to the south of Taipei 101 then the tallest building in the world. Relocated earthquakes show a southeast-dipping distribution of hypocenters beneath the Taipei basin. The seismicity pattern and focal mechanisms of the three felt events suggest the existence of a blind normal fault whose surface projection is along the river channel in the middle of the basin.
Highlights
Taiwan is situated along the collision boundary between the Philippine Sea plate and the Eurasian plate (Tsai et al 1977; Wu 1978; Lin 2002)
The Philippine Sea plate has subducted underneath the Eurasian plate in northern Taiwan (Fig. 1)
The Taipei Metropolitan Area (TMA), the political, economic, and cultural center of Taiwan, including the City of Taipei and several satellite cities lies within the Taipei basin and demands serious attention to seismic risk mitigation
Summary
Taiwan is situated along the collision boundary between the Philippine Sea plate and the Eurasian plate (Tsai et al 1977; Wu 1978; Lin 2002). The Philippine Sea plate has subducted underneath the Eurasian plate in northern Taiwan (Fig. 1) This collision causes high seismicity in the Taiwan region (e.g., Wang 1998). Lin (2005) suggested that the felt earthquakes were triggered by the load of the massive skyscraper (Taipei 101) and an active blind normal fault was located just beneath the building. Due to the importance of TMA for Taiwan, it is necessary to determine if the seismic activity is associated with the three known faults or others existing beneath the Taipei basin. We will study the correlation between seismicity and faults and explore the possibility of the existence of blind active faults
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