基于随机有限断层法的地震烈度计算研究  

Computational Research on the Seismic Intensity Based on Stochastic Finite Faults Method

作　　者：王俊[1] 霍祝青[1] 詹小艳[1] 宋浩[1] 江昊琳[1] 徐戈[1] 

机构地区：[1]江苏省地震局,江苏南京210014

出　　处：《地震研究》2012年第3期374-380,共7页Journal of Seismological Research

基　　金：国家自然科学基金项目(41074036);江苏省地震局青年基金(10420)联合资助

摘　　要：采用基于动力学拐角频率的随机有限断层法,首先模拟计算了东台、如皋及大丰3个台站记录的2006年江苏东台3.8级地震的地震动,并与其实际记录进行比较研究,验证了该方法的计算结果能够较好地反映出江苏地区主震剪切波的主要特征。随后运用该方法模拟计算了1979年江苏溧阳6.0级地震震源区内156个虚拟观测点的地震动,并通过内插值的方式得到此次地震的加速度场分布情况;随后依据峰值加速度统计方法和模糊评定方法,分别计算此次地震的理论烈度分布,结果显示:两种烈度划分方法的结果与实际调查的烈度分布都基本一致,但模糊评定方法的划分结果更加接近真实的烈度分布。Firstly, using stochastic finite faults method based on the dynamic comer frequency, we simulated the syn- thetic ground motion of Dongtai M3.8 earthquake, Jiangsu in 2006 recorded by Dongtai, Rugao and Dafeng stations and compared synthetic ground motion with the actual ground motion recordings. We find that the syn- thetic ground motion using improved stochastic finite faults method can better reflects the main features of shear wave of main shock in Jiangsu area. Secondly, we apply this method to simulate the synthetic ground motion of 156 virtual observation points in source region and got the distribution of synthetic acceleration field of Liyang M6.0 earthquake in 1976. Thirdly, we respectively calculated the theoretical distribution of seismic intensity by peak acceleration statistical method and fuzzy evaluation method. The results showed that the intensity classifica- tion results by two methods essentially consistent with that of the actual investigation. However, intensity classifi- cation result by the fuzzy evaluation method is more consistent with distribution of actual intensity.

关 键 词：动力学拐角频率 随机有限断层法 合成地震动 地震烈度 溧阳6.0级地震 

分 类 号：P315.9[天文地球—地震学]