基于GPS和强震资料反演汶川8.0级地震的同震滑动模型  

Inversion of Wenchuan 8.0 earthquake based on GPS and strong earthquake data Coseismic sliding model

作　　者：陈聪[1] 何福秀 张澜 CHEN Cong;HE Fuxiu;ZHANG Lan(Sichuan Farthquake Agency,Sichuan Chengdu 610041,China)

机构地区：[1]四川省地震局,四川成都610041

出　　处：《四川地震》2021年第1期1-5,共5页Earthquake Research in Sichuan

基　　金：四川省地震局科技专项(LY1908);“川滇区域GNSS大地构造物理及壳幔动力研究”科技创新团队(201803)资助.

摘　　要：通过震中附近GPS同震位移资料,采用SDM反演法,应用均匀介质模型和分层地壳结构模型分别反演汶川8.0级地震的同震滑动,并加入强震资料进行反演对比分析,结果表明:两种模型反演的同震滑动分布与发震断层的科考结果吻合,分层地壳结构模型的反演结果整体上要优于均匀地壳结构模型的反演结果;GPS与强震数据分别反演得到的同震位移方向、幅度和断层错动方式基本一致,GPS、强震单一数据反演和联合反演结果得到的矩震级、平均滑动量具有很好的一致性。总体而言,强震模型的最大滑动量和最大应力降较GPS模型的结果更为显著,可能与强震数据中出现较大水平位移的站点与断层更为接近有关。By GPS data of coseismic displacement near the epicenter,the SDM inversion method is adopted,the applicat ion of homogeneous medium model and layered crust structure model inversion are used to calculate respec-tively coseismic slip model of wenchuan 8.0 earthquake.And join the earthquake data inversion comparison analy-sis are made.The results show that the two kinds of distribution of coseismic slip model inversion and the seis-mogenic fault of research results,layered crustal structure model of inversion result is better than uniform crustal.structure model on whole results.The direction,amplitude and fault dislocation mode of the co-earthquake displacement obtained by GPS and strong earthquake data are basically the same,and the moment magnitude and average slip magnitude obtained by GPS,single data inversion of strong earthquake and joint inversion have a good consistency.In general,the maximum slip momentum and maximum stress drop of the strong earthquake model are more significant than those of the GPS model,which may be related to the closer proximity of the stations and faults with large horizontal displacement in the strong earthquake data.

关 键 词：汶川地震 同震位移 GPS 强震 同震滑动模型 

分 类 号：P315.7[天文地球—地震学]