同震变形中模型分层和重力影响研究  

ON INFLUENCES OF EARTH STRATIFICATION AND GRAVITATION ON CO-SEISMIC DEFORMATION

作　　者：袁旭东[1] 汪汉胜[1] 柯小平[1] 王志勇[1] 

机构地区：[1]中国科学院测量与地球物理研究所动力大地测量学重点实验室

出　　处：《大地测量与地球动力学》2007年第1期69-76,共8页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(40574010);中国科学院人事教育局专项基金

摘　　要：利用同震和震后变形模拟软件包,以我国唐山7.8级地震和伽师6.8级地震为例,在考虑和忽略重力两种条件下,分别采用弹性半空间均匀模型和分层模型,模拟和比较了同震地表水平与垂直形变的差异,结果发现模型分层和重力的影响非常显著,超过了可观测到的量级。表明在应用Okada模型分析类似震例时模型分层和重力的影响是不可忽略的。The co-seismic vertical and horizontal deformations for two earthquakes（ Tangshan M7.8 earthquake in 1976 ,Jiashi M6.8 earthquake in 2003 ） in China are calculated by use of the two softwares for co-seismic and post-seismic deformation. The computations are impleme gravitation with elastic homogeneous half-space/elastic nted under the cases of taking into account/neglecting the layered half-space earth model respectively. The results show that the influences of earth＇ s stratification and gravity on the co-seismic deformation greatly exceed the resolution of modem observation techniques. It indicates the influences of earth＇ s stratification and gravity cann＇ t be ignored in analyzing the similar earthquakes with the Okada＇ s model.

关 键 词：地震位错 同震变形 地球分层 重力 震源参数 

分 类 号：P315.726[天文地球—地震学]