芦山7.0级地震形变孕震背景及同震响应  

Deformation Preparation Background of Lushan M_S7. 0 Earthquake and its Coseismal Response

作　　者：蒋锋云[1] 朱良玉[1] 张晓亮[1] 王双绪[1] 季灵运[1] 

机构地区：[1]中国地震局第二监测中心,陕西西安710054

出　　处：《地震研究》2013年第4期450-454,共5页Journal of Seismological Research

基　　金：中国综合地球物理场观测-鄂尔多斯地块周缘地区(201208009);中国地震局地震行业科研专项(201208006)联合资助

摘　　要：通过对芦山7.0级地震前龙门山断裂附近地壳水平变形的动态变化分析,认为汶川8.0级地震对芦山7.0级地震具有促进作用,芦山地震震前存在明显的中长期地壳水平形变孕震背景。并利用有限断层面解,借助球面位错模型,计算了芦山地震地表同震位移场,对比震中附近GPS基准站SCTQ高频观测资料处理结果,认为芦山地震同震影响范围较小。Analyzing the dynamic variation of crust horizontal deformation nearby the Longmenshan Fault before Lushan M7.0 earthquake,we proposed that Wenchuan M8.0 earthquake play an active role for Lushan M7.0 earthquake.There exited obvious earthquake preparation background of crustal horizontal deformation in medium-and long-term before Lushan M7.0 earthquake.Using finite-fault plane solution of Lushan M7.0 earthquake,we calculated the surface coseismal displacement field of Lushan M7.0 earthquake by spherical dislocation model.Contrasted with the processing result of high frequency observation data of GPS reference station SCTQ near the epicenter,we concluded that the coseismal influence scope of Lushan M7.0 earthquake is small.

关 键 词：芦山地震 汶川地震 地壳水平变形 同震响应 

分 类 号：P315.727[天文地球—地震学]