Abstract
Taiwan is located on the boundary between the Eurasia Plate and Philippine Sea Plate, which is a very high seismicity rate area. We begin calculating the earthquake occurrence probability using four recurrence models to mitigate seismic disasters. We focus on estimating the occurrence probabilities for regional earthquake sources based on the catalog released by the Central Weather Bureau over the period from 1900 to 2011. According to the tectonic and seismicity characteristics areas in and around Taiwan are divided into several zones for shallow and deep earthquakes. We utilize four recurrence models to estimate the earthquake occurrence probabilities over the next 30 and 50 years, respectively. In addition, the grid-based probabilities in 0.1° × 0.1° spatial size are calculated using the micro-zoning method. The results obtained from four recurrence models show that areas with high values over the next 30 and 50 years are correlated with two subduction zones and a suture zone. High probabilities in the western foothills appear highly active tectonic. Moreover, the high values appear at in Eastern Taiwan, offshore Hualien County. There are discrepancies between the results from the four models. The highest grid-based probability is about 3.0, 3.5, 2.5 and 3.5% for the Lognormal, Gamma, Exponential, and Weibull models, respectively. The inland probabilities are below 0.5% for the results from Lognormal, Gamma, and Weibull models. Even so, the results from the Exponential model are upmost in the range from 0.5-1.0%.
Highlights
Taiwan is located on an arc and continent collision zone, which is the boundary between the Eurasian plate (EP) and the Philippine Sea plate (PSP) (Fig. 1)
Due to insufficient information on fault sources at present we focus on evaluating the occurrence probability for regional sources under the assumption that all earthquakes occur independently, known as the Poisson process
In order to reduce the influence on the location precision by the Taiwan Central Weather Bureau Seismic Network (CWBSN), we defined the source depth ≤ 40 km as shallow source and source depth ≥ 35 km as deep source
Summary
Taiwan is located on an arc and continent collision zone, which is the boundary between the Eurasian plate (EP) and the Philippine Sea plate (PSP) (Fig. 1). The priority region designation mechanism is to organize a working group that stresses the tasks of surveying the fault parameters, estimating the earthquake occurrence probabilities and evaluating the seismic risks for Taiwan. Results from the working group will conclude the priority regions for seismic hazard mitigation To achieve this goal the working group is composed of three forums (Fig. 3). The second one hosted by NCDR and the Central Weather Bureau (CWB) is the Earthquake Potential Forum which calculates the occurrence probabilities for regional source earthquakes and predicts the ground shaking of a specific earthquake. We utilize the micro-zoning method to elaborately calculate the occurrence probabilities for each grid with a size of 0.1° × 0.1° covering the Taiwan area over the 50 years to meet seismic hazard mitigation needs
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