2023年12月18日甘肃积石山M_(S)6.2地震多点源地震矩张量反演研究  

Study of Seismic Moment Tensor Inversion by Multi-point Sources for Jishishan M_(S)6.2 Earthquake on December 18,2023,in Gansu Province,China

作　　者：刘俊清 张小刚[2] 张宇[3] 蔡宏雷[3] 陈卓[3] 包秀敏 LIU Jun-qing;ZHANG Xiao-gang;ZHANG Yu;CAI Hong-lei;CHEN Zhuo;BAO Xiu-min(School of Geomatics and Prospecting Engineering,Jilin Jianzhu University,Changchun 130119,China;Basic Geographic Information Center of Jilin Province,Jilin Provincial Surveying and Mapping Archives,Changchun 130062,China;Jilin Earthquake Agency,Changchun 130117,China;Shenyang Earthquake Monitoring Center Station,Liaoning Earthquake Agency,Shenyang 110161,China)

机构地区：[1]吉林建筑大学测绘与勘查工程学院,吉林长春130119 [2]吉林省基础地理信息中心,吉林省测绘档案资料馆,吉林长春130062 [3]吉林省地震局,吉林长春130117 [4]辽宁省地震局沈阳地震监测中心站,辽宁沈阳110161

出　　处：《地震》2024年第2期169-177,共9页Earthquake

基　　金：吉林省教育厅科学技术研究项目(JJKH20220260KJ)。

摘　　要：基于区域宽频带数字地震台网观测到的地震记录,采用多点源地震矩张量反演方法对2023年甘肃积石山M_(S)6.2地震进行了地震矩张量反演研究。结果显示,该地震震源机制解的NE倾的节面(走向312°,倾角48°,滑动角76°)为发震断裂,主体地震矩从震源向地表沿滑动矢量的方向(方位角236°,倾伏角40.5°)释放,主破裂持续时间约为5.8 s,与此同时,地震破裂区断层面上发生了次级的双侧破裂。Based on the observed seismograms from the regional broadband digital seismic network, the multi-point source seismic moment tensor inversion method is employed to perform the seismic moment tensor inversion for the 2023 Jishishan M_(S)6.2 main earthquake in Gansu Province, China. The results show that the NE dipping nodal surface(strike 312°, dip 48°, and rake 76°) of the focal mechanism solution is the seismogenic fault. The majority of seismic moments are released from the source to the ground surface along the direction of the slip vector of the focal mechanism solution(azimuth 236°, plunge 40.5°), and the main rupture lasts about 5.8 s. At the same time, the secondary bilateral rupture occurred on the fault plane in the rupture zone of the earthquake.

关 键 词：积石山6.2级地震 地震矩张量 多点源 发震构造 

分 类 号：P315.7[天文地球—地震学]