考虑凹凸体理论的经验格林函数方法  

An empirical Green function approach with asperity model considered

作　　者：吴迪[1] 罗奇峰[2] 熊焱[3] 

机构地区：[1]广州大学广东省地震工程与应用技术重点实验室,中国广州510405 [2]同济大学上海防灾救灾研究所,中国上海200092 [3]华南理工大学亚热带建筑科学国家重点实验室,中国广州510405

出　　处：《地震学报》2009年第5期555-563,共9页Acta Seismologica Sinica

基　　金：国家自然科学基金(50578125;90815027);减震控制与结构安全开放实验室资助项目

摘　　要：以15次地震资料为基础,回归得到断层上所有凹凸体地震矩与凹凸体面积的关系;研究经验格林函数方法中凹凸体子源的应力降,提出基于断层凹凸体理论的经验格林函数方法;以唐山地震余震(MS=6.9)作为经验格林函数,合成1976年唐山地震(MS=7.8)的地震动,比较合成结果与观测记录表明,该方法符合断层破裂过程,计算结果可靠.On the basis of the research on 15 earthquake, a relation between the seismic moments and the area of all asperities on seismic faults is worked out. The average stress drop of the asperities used for the empirical Green function （EGF） approach is generally obtained by linear regression analysis. A simplified EGF method based on the asperity model is proposed. A computer program based on this proposed method is developed to numerically synthesize the far- field seismic records of the 1976 Ms7. 8 Tangshan earthquake. The accelerograms of the Tangshan earthquake at Guanting station are synthesized by using an Ms6.9 aftershock record as the Green function. Comparison of the camputed accelerogram with the observation shows that the numerical result obtained in this paper is accurate and reliable.

关 键 词：凹凸体 震源模型 反应谱 经验格林函数 唐山地震 

分 类 号：P315.3[天文地球—地震学]