南海北部地震危险性分析

在建立了比较可靠的南海北部地震目录以后,采用编制中国地震动参数区划图（2001）的方法,重新划分了南海北部海域的潜在震源区和调整了相关的地球物理参数,最终计算了南海北部海域50年超越概率10％的地震动峰值加速度。南海北部的地震动峰值加速度可分成东部高值区和西部低值区。东区的地震动峰值加速度在0．160g以上,西区大部分海域的地震动峰值加速度小于0．114g,并且与它们北侧的陆区大致相似。

Seismic Risk Analysis in Northern South China Sea

Based on the establishment of a more reliable earthquake catalogue of northern South China Sea and the compilation method of ＂Zonation map of ground motion parameters in China＂ （2001）, the potential seismic source zones in northern South China Sea are re-divided and the associated geophysical parameters are adjusted in this paper. On this basis, the peak ground accelerations with a 50-year exceeding probability of 10% have been calculated. The results show that the eastern part of northern South China Sea reveals higher peak ground acceleration values than the western part. The peak ground aceeleration in the eastern part exceeds 0.160g, whereas that in the western part is less than 0.114g. But both in the western and eastern parts of northern South China Sea, the peak ground accelerations of most of the marine area carl be correlated with that in the adjoining land area.