The Microzonation of Seismic Design Earthquake for Taipei Basin

Abstract eng:
Taiwan is located at the convergent plate boundary where the Eurasian plate has been eastward underthrusting and colliding with the Philippine Sea plate. This tectonic environment results in high seismicity in and around the Taiwan Island. Undoubtedly, earthquake hazard mitigation is an important issue in Taiwan. It is worthy of noting that Taipei City, the capital of Taiwan and located on a sediment-filled basin, has experienced several damaging earthquakes in which the most recent event occurred on March 31, 2002. Obviously, even the earthquake located more than 80-100 km away, it still cause the severe damage in the Taipei Basin due to the site or basin effect. The essential way to mitigate the earthquake hazard is to refine the current seismic design code by a more a proper definition of seismic demands for different site conditions so that the undesired damage of structures due to earthquake excitations can be efficiently prevented. The CWB has installed a very dense ground-motion array in the Taipei Basin. The earthquake data collected in the last decades was used to investigate the local site effects on the ground shaking in the Taipei Basin. Based on the attenuation relationship modified by the records of reference sites to eliminate the source and path effects by events, the site effect of each TSMIP station was studied and quantified by an amplification factor to the reference site (hard site). Applying the ground motion amplification factors with more detailed information on site conditions can remove bias and reduce the uncertainly of ground motion estimates from the attenuation relationship. Finally, performing the probabilistic seismic hazard analyses with the proposed site amplification factors, the more proper microzonation of the Taipei basin can be proposed for the current seismic design code.

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