【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。更多还原

【Abstract】 Firstly,using stochastic finite faults method based on the dynamic corner frequency,we simulated the synthetic 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 synthetic 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 classification results by two methods essentially consistent with that of the actual investigation.However,intensity classification result by the fuzzy evaluation method is more consistent with distribution of actual intensity.更多还原