震后短期和长期形变模拟-以1960年智利Mw9.5地震为例  

Modeling transient and long-term postseismic deformation:A case study of 1960 M_W9.5 Chile earthquake

作　　者：邵志刚[1] 傅容珊[1] 薛霆虓[1] 查显杰[1] 

机构地区：[1]中国科学院壳幔物质与环境重点实验室,中国科学技术大学地球与空间科学学院

出　　处：《地震学报》2008年第4期405-415,共11页Acta Seismologica Sinica

基　　金：National Natural Science foundation of China (40274033)

摘　　要：以1960年5月智利瓦尔迪维亚(Valdivia)MW9.5地震为例分析震后不同时期的形变,实现了以Burgers体为粘弹介质模型来模拟震后粘弹松弛效应有限元数值模拟.计算结果表明,该粘弹介质模型可以模拟地震引起的瞬时同震弹性响应及震后粘弹松弛的短期和长期响应.由1960智利MW9.5地震震后模拟的应变率显示以Burgers体为粘弹介质模型可以解决Maxwell体在模拟震后短期和长期形变不协调问题.Taking the 1960 Valdivia, Chile, Mw9.5 earthquake as an example, we firstly usd finite element method （FEM） with Burgers medium model to calculate the post-seismic visco-elastic relaxation. The calculated post-seismic deformation includes coseismic, transient post-seismic and long-term post-seismic deformation, when we took the Burgers model as viseo-elastic medium for cal- culating post-seismic deformation of the 1960 Chile Mw9. 5 earthquake, there did not appear uncoordinated result as caused by using Maxwell material model due to different durations of post-seismic deformation.

关 键 词：智利地震 震后形变 Burgers体 粘弹介质 有限元 

分 类 号：P315.725[天文地球—地震学]