2022年四川芦山6.1级地震构造与地质灾害分析  

Analysis of Geological Hazard and Seismic Tectonic of the Lushan M S6.1 Earthquake on June 1,2022

作　　者：廖程 梁明剑[1,2] 周文英 吴微微 薛莲[1] 毛泽斌 毛富林 Liao Cheng;Liang Mingjian;Zhou Wenying;Wu Weiwei;Xue Lian;Mao Zebin;Mao Fulin(Sichuan Earthquake Agency,Chengdu 610041,China;Chengdu Institute of Tibetan Plateau Seismology,China Earthquake Administration,Chengdu 610041,China;Yonglilink Science and Technology Company Ltd.,Chengdu 610000,China;Sichuan Nuclear Industry Geological Bureau 281st Brigade,Xichang 615000,Sichuan,China)

机构地区：[1]四川省地震局,成都610041 [2]中国地震局成都青藏高原地震研究所,成都610041 [3]成都市永利联科技有限公司,成都610000 [4]四川省核工业地质局二八一大队,四川西昌615000

出　　处：《中国地震》2023年第2期334-345,共12页Earthquake Research in China

基　　金：西藏拉萨地球物理国家野外科学观测站研究课题(NORSLS21-04);四川省自然科学基金(2022NSFSC0211);地震动力学国家重点实验室开放基金(LED2020B02);四川省地震局地震科技专项(LY2216、LY2217)共同资助。

摘　　要：2022年6月1日四川芦山6.1级地震发生在龙门山断裂带南段,位于2013年芦山7.0级地震余震区北侧,引发了比较严重的次生地质灾害。基于现场调查与遥感解译,本文分析了地震地质灾害的空间分布及其与地形坡度、岩性、断裂的关系,结合主余震空间分布及震源机制解结果,初步讨论了其发震构造与次生地质灾害的关系。结果表明:①基于现场调查资料,地震地质灾害主要发育于东河河谷一带,类型多为中小型的岩质滑坡,坡度主要在30°~50°范围,岩性主要为闪长岩和花岗岩;②此次地震的发震构造与2013年芦山7.0级地震不同,且并非双石—大川断裂;③此次地震的发震构造为倾向SE的盲逆反冲断层,地质灾害主要发育于发震断裂的上盘,且主要分布于沿东河河谷发育的五龙—盐井断裂分支断裂和双石—大川断裂之间的区域。The Lushan M_(s)6.1 earthquake occurred in the southern section of the Longmenshan fault zone on June 1,2022,which is located in the north of the residual area of the Lushan M S7.0 earthquake in 2013,causing a relatively serious secondary geological disaster.Based on field investigation and remote sensing interpretation,this paper analyzes the spatial distribution of seismic geological hazards and their relationship with topographic slope,lithology and faults.Combined with the spatial distribution of main aftershocks and the results of focal mechanism solution,the relationship between seismogenic structures and secondary geological hazards is discussed preliminarily.The results show that:①The field investigation suggests that the seismic and geological disasters mainly occur in the Donghe river valley area,in the types of small and medium-sized rock landslides mostly.The slope is dominantly in the range of 30°~50°,and the lithology is mainly diorite and granite.②The seismogenic structure of this earthquake is different from that of Lushan earthquake in 2013,which is related to Shuangshi-Dachuan fault.③The seismogenic structure of this earthquake is a blind reverse thrust fault inclined to SE,and the geological disaster mainly developed in the upper wall of the fault,and mainly distributed in the area between the branch fault of Wulong-Yanjing fault and Shuangshi-Dachuan fault along the Donghe river valley.

关 键 词：芦山6.1级地震 地震地质灾害 地震构造 逆冲断层 

分 类 号：P315[天文地球—地震学]