基于GPS、InSAR和强震数据联合反演2017年九寨沟MS7.0地震同震滑动分布  

Coseismic Slip Distribution of the 2017 MS7.0 Jiuzhaigou Earthquake from Joint Inversion of GPS,InSAR and Strong Motion Data

作　　者：黄勇[1,2] 陈威[2] 李琦[2] 王东振[2] 方智伟 HUANG Yong;CHEN Wei;LI Qi;WANG Dongzhen;FANG Zhiwei(Institute of Geophysics,CEA,5 South-Minzudaxue Road,Beijing 100081,China;Key Laboratory of Earthquake Geodesy,Institute of Seismology,CEA,40 Hongshance Road,Wuhan 430071,China)

机构地区：[1]中国地震局地球物理研究所,北京市100081 [2]中国地震局地震研究所地震大地测量重点实验室,武汉市430071

出　　处：《大地测量与地球动力学》2020年第6期565-570,共6页Journal of Geodesy and Geodynamics

基　　金：湖北省自然科学基金(2019CFB555);国家自然科学基金(41431069,41574017,41541029,41731071,41572354);国家重点研发计划(2018YFC1503605)。

摘　　要：以多源观测为约束,利用近场GPS、InSAR同震位移和强震观测数据联合反演2017年九寨沟M S7.0地震发震断层的几何形状和破裂模型,并初步分析其地震成因。结果表明,九寨沟地震的发震断层走向154°,倾角80°,以左旋走滑为主,兼有少量正断分量;地震破裂主要集中在2~12 km深度范围,最大滑移量为1.6 m,位于地下6 km深处,断层在近地表没有滑移;地震释放的地震矩为5.59×10^18 Nm,矩震级为M W6.44。结合余震分布认为,该地震的发震断层为隐伏的虎牙断裂北段。On 8 August 2017,a M S7.0 earthquake struck Jiuzhaigou county,Sichuan province,China.In this study,we use GPS,InSAR and strong motion data to invert the fault geometry and rupture model associated with the earthquake and analyze the cause of the earthquake.The results show that the Jiuzhaigou earthquake occurred on a blind strike-slip fault with strike 154°and dip 80°.The coseismic slip is dominated by left-lateral strike slip with a slight normal slip component and mainly locates at a depth of 2-12 km.The maximum slip is 1.6 m at a depth of 6 km.There is no slip on the subfault patches near the surface.The total seismic moment released in the Jiuzhaigou earthquake is 5.59×10^18 Nm,corresponding to an M W6.44 event.We believe that the seismogenic fault is the hidden northern segment of the Huya fault.

关 键 词：九寨沟地震 同震位移 断层几何形状 破裂模型 

分 类 号：P315[天文地球—地震学]