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Abstract

This paper presents an estimation of ground shaking intensity in the Ilan area caused by two scenario earthquakes. On the basis of seismic activity in the study area, the seismic zones, including Okinawa trough seismic zone section A and Suao-Hualien offshore seismic zone are established. The earthquakes occurring in these two zones are considered as the scenario earthquakes. The hundreds of boring logs are also collected and classified into three site classes as specified in the Taiwan Seismic Building Code. The intensity of ground shaking in the Ilan area caused by a scenario earthquake is then estimated by using an appropriate attenuation relation and a site modification factor. When the scenario earthquake occurs in the Okinawa trough seismic zone section A, the intensity of ground shaking is more severe in Lotung Town and Ilan City. On the other hand, when the scenario earthquake occurs in the Suao-Hualien offshore seismic zone, the intensity of ground shaking is more severe in Suao Town. The results of this study may be used to simulate seismic disaster scenarios and then to implement a strategy for seismic disaster reduction.

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