利用区域地震记录反演2022年泸定M_(s)6.8地震破裂过程  

Inversion of the Rupture Process of the 2022 Luding M_(s)6.8 Earthquake by Regional Seismic Data

作　　者：王安简 李国辉 高原[1] WANG An-jian;LI Guo-hui;GAO Yuan(Key Laboratory of Earthquake Forecast,Institute of Earthquake Forecasting,CEA,Beijing 100036,China)

机构地区：[1]中国地震局地震预测重点实验室(地震预测研究所),北京100036

出　　处：《地震》2023年第1期33-41,共9页Earthquake

基　　金：国家自然科学基金项目(U2039207,42074065);中国地震局地震预测研究所基本科研业务费专项实验室研发计划资助项目(2021IEF0103)。

摘　　要：2022年9月5日在四川省甘孜藏族自治州泸定县发生一次M_(s)6.8地震.基于区域地震波形数据,对主震震源破裂过程进行反演,结果表明:这次地震发震断层为鲜水河断裂,总体表现为左旋走滑.破裂主要沿断层走向向SSE方向传播,并由起始破裂点向浅部扩展,整个过程持续约13 s,释放标量地震矩为1.2×10^(19)N·m,相当于Mw6.6.破裂长度约18 km,宽度约14 km,最大同震滑动量为2.7 m,估计的矩心深度为6.2 km.与远震波形数据反演结果相比,此次地震主要破裂区位于震中SSE一侧,在震中NNW一侧没有发现较为明显的破裂区.On September 5,2022,an M_(s)6.8 earthquake occurred in Luding County,Ganzi Tibetan Autonomous Prefecture,Sichuan Province.In this study,we analyzed regional seismic data and inverted the focal rupture process of the main shock.The results show that the seismic fault of this earthquake is the Xianshuihe fault of generally left-lateral strike-slip.The rupture propagated primarily in the SSE direction along the fault strike,expanding from the initial rupture point to the shallow part.The duration of the entire process was approximately 13 s,releasing a scalar seismic moment of 1.2×10^(19)N.m,equivalent to M_(w)6.6.The rupture had a length of about 18 km and a width of 14 km,with a maximum coseismic slip of 2.7 m and an estimated centroid depth of 6.2 km.Comparing our inversion results with those obtained from teleseismic waveform data,we conclude that the main rupture area of this earthquake is located on the SSE side of the epicenter,while no obvious rupture area is observed on the NNW side of the epicenter.

关 键 词：2022年泸定M_(s)6.8地震 震源破裂过程 波形反演 同震滑动 

分 类 号：P315.3[天文地球—地震学]