地球与行星物理论评（中英文）2025，Vol.56Issue(5)：563-572,10.DOI:10.19975/j.dqyxx.2024-028
2022年9月5日四川泸定MS6.8地震余震序列重定位研究
Aftershock sequence relocation of the MS6.8 earthquake on September 5,2022,in Luding,Sichuan Province
摘要
Abstract
On September 5,2022,an MS6.8 earthquake,with a meizoseismal intensity of IX,struck Luding,Sichuan Province,causing severe casualties and economic losses.In this study,we applied the double-difference al-gorithm(HypoDD)to relocate the mainshock and aftershock sequences within a 25-day period.Precise hypocen-tral and spatial distributions were determined,with the hypocentral location of the mainshock recorded at(29.59°N,102.10°E)and a depth of 14.3 km.By analyzing the spatial and temporal distribution of aftershocks and the depth profile of the Luding MS6.8 earthquake,we estimate that the aftershock fracture zone spans approximately 65 km long and 10-20 km wide.Three distinct aftershock clusters formed along the northern,central,and southern sec-tions of the fault,with focal depths gradually deepening from north to south.Further analysis of the seismic struc-ture revealed that the mainshock and aftershocks were distributed unilaterally along the Xianshuihe fault,specifi-cally along the Moxi segment.This earthquake also activated a secondary,previously hidden fault near Gongga Mountain.Additionally,we examined the seismogenic relationships between the MS6.8 Luding earthquake and oth-er recent seismic events,including the 2022 MS6.1 Lushan earthquake,the 2013 MS7.0 Lushan earthquake,and the 2014 MS6.3 Kangding earthquake.Using the IDS system,we inverted the hypocentral movement characteris-tics and obtained the basic parameters of the mainshock rupture,finding a strong correlation between the rupture process and the spatial distribution of aftershocks.关键词
泸定地震/余震序列/双差定位/震源位置Key words
Luding earthquake/aftershock sequence/double difference location/hypocenter location分类
地球科学引用本文复制引用
张胜霞,马晓妹,张风雪..2022年9月5日四川泸定MS6.8地震余震序列重定位研究[J].地球与行星物理论评（中英文）,2025,56(5):563-572,10.基金项目
甘肃省地震局科技发展基金资助项目(2022G04,KY2203003) （2022G04,KY2203003）
甘肃省青年科技基金资助项目(22JR5RA826,25JRRA396)Supported by the Science and Technology Development Foundation of Gansu Earthquake Agency(Grant Nos.2022G04,KY2203003),and the Science and Technology Foundation for Young Scientists of Gansu(Grant Nos.22JR5RA826,25JRRA396) （22JR5RA826,25JRRA396）
