震源参数对地震动相干函数的影响  

Effects of source parameters on coherency function of ground motion

作　　者：丁海平[1,2] 宋贞霞[1] 

机构地区：[1]江苏省结构工程重点实验室(苏州科技学院),江苏苏州215011 [2]中国地震局工程力学研究所,哈尔滨150080

出　　处：《振动与冲击》2010年第7期16-18,74,共4页Journal of Vibration and Shock

基　　金：国家重点基础研究发展计划(973)项目(2007CB714200);国家自然科学基金项目(50378087)

摘　　要：基于运动学震源模型,以弹性半空间作为传播介质模型,采用显式有限元数值模拟方法进行强地面震动数值模拟,根据模拟结果考察了震源深度、断层破裂子源大小、破裂速度和断层走向等震源参数对地震动相干函数的影响,结果表明:震源深度和断层走向对相干函数的影响较大。并根据统计结果给出了一个基岩地震动的相干函数模型。Using an elastic half-space model,the effects of source parameters on spatial variation of stochastic ground motions were studied here by means of the explicit finite element method and the kinematic source model.The results showed that the fault depth,the rupture velocity,the size of sub-source and the fault direction have influence on the coherency function of the ground motion,especially,the effects of the fault depth and the fault direction are larger.At last,a coherency function model for base-rock motion with statistic method was proposed.

关 键 词：震源参数 弹性介质 地震动空间变化 相干函数 

分 类 号：P315.9[天文地球—地震学]