Coseismic vertical deformation of the M_S8.0 Wenchuan earthquake from repeated levelings and its constraint on listric fault geometry

查看全文 作　　者：Qingliang [1]Wang;Duxin [1]Cui;Xi [1]Zhang;Wenping [1]Wang;Jinwen [1]Liu;Kang [1]Tian;Zhaoshan [2]Song

机构地区：[1]Second Monitoring Center, China Earthquake Administration, Xi'an 710054, China;[2]First Monitoring Center, China Earthquake Administration, Tianjin 300180, China

出　　处：《Earthquake Science》索引2009年第22卷第6期,共8页

基　　金：jointly sup-ported by National Key Basic Research 973 project(2004CB418403);National Natural Science Foundation of China(40974062) 摘　　要：The devastating MS8.0 Wenchuan earthquake ruptured two large parallel thrust faults along the middle segment of the Longmenshan thrust belt.Preseismic and postseismic leveling data indicated the hanging wall of the YingxiuBeichuan-Nanba thrust fault mainly presented coseismic uplift with respect to the reference point at Pingwu county town, and the observed maximum uplift of 4.7 m is located at Beichuan county(Qushan town)which is about 100 m west of the fault scarp.The foot wall of the Yingxiu-Beichuan-Nanba thrust fault mainly showed subsidence with maximum subsidence of 0.6 m near the rupture.By employing a listric dislocation model,we found that the fault geometry model of exponential dip angleδ=88°×[1-exp(-9/h)]with depth of 18 km and uniform thrust-slip of 5.6 m could fit the observed coseismic vertical deformation very well,which verifies the listric thrust model of the Longmenshan orogenic zone. 关键词：地震断层几何约束垂直变形汶川龙门山造山带几何模型逆冲断层地震破裂

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Coseismic vertical deformation of the M_S8.0 Wenchuan earthquake from repeated levelings and its constraint on listric fault geometry

参考文献(12)

引证文献(25)

耦合文献(318)

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