区域地震记录揭示的2023年甘肃积石山6.2级地震震源破裂过程  

Source Rupture Process of the 2023 M6.2 Jishishan,Gansu Earthquake Using the Regional Seismic Data

作　　者：罗艳[1] 朱音杰 高原[1] LUO Yan;ZHU Yin-jie;GAO Yuan(Key Laboratory of Earthquake Prediction,Institute of Earthquake Forecasting,China Earthquake Administration,Beijing 100036,China;Hebei Earthquake Agency,Shijiazhuang 050021,China)

机构地区：[1]中国地震局地震预测研究所,地震预测重点实验室,北京100036 [2]河北省地震局,河北石家庄050021

出　　处：《地震》2024年第1期189-194,共6页Earthquake

基　　金：地震科学联合基金项目(U1939202);中国地震局地震预测研究所基本科研业务费专项(CEAIEF20220203);国家自然科学基金项目(41974063)。

摘　　要：基于有限断层模型反演方法,利用区域宽频带地震波形数据,反演了2023年12月18日甘肃临夏积石山6.2级地震的震源破裂过程,获得了积石山地震破裂滑动时空分布:此次地震是逆冲兼少量走滑型地震,破裂持续时间约为9 s,主体能量在前6 s释放,地震破裂主要沿断层走向向NW方向拓展,计算得到的标量地震矩为1.39×10^(18)N·m,相当于M_(W)6.02,破裂尺度约10 km左右,最大同震滑动量为35 cm。We carried out the inversion for finite-fault rupture process of the 2023 M6.2 Jishishan earthquake using the regional broadband seismic data.The result shows that the seismic fault of the Jishishan earthquake is thrust with slight strike-slip components.The rupture lasted about 9 s and the most seismic energy is mainly released within 6 s.The finite-fault slip model shows that the Jishishan earthquake rupture initiated from the hypo-center and expanded northwestward along the fault strike.The total seismic moment released by this fault is 1.39 ×10^(18)N·m equal to M_(w)6.02.The rupture length is about 10 km with a maximum coseismic slip of 35 cm.

关 键 词：2023年积石山6.2级地震 震源破裂过程 滑动分布 有限断层 

分 类 号：P315.7[天文地球—地震学]