2012年6月24日宁蒗—盐源5.7级地震的发震构造浅析  

Brief Seismotectonic Analysis of the June 24,2012 Ninglang-Yanyuan M_S5.7 Earthquake

作　　者：胡朝忠[1] 杨攀新[1] 熊仁伟[1] 

机构地区：[1]中国地震局地震预测研究所,北京100036

出　　处：《地震》2012年第4期140-147,共8页Earthquake

基　　金：中国地震活断层探查--南北带中南段(60112303;60112304);中国地震局地震预测研究所基本科研业务经费(0210240201;02122407)联合资助

摘　　要：本文在分析2012年6月24日宁蒗—盐源5.7级地震的震源机制解、余震特征、震害分布基础上,结合区域第四纪地层分布成因特征、区域地质构造特征以及对三维卫星遥感影像进行断层地貌解译分析,认为此次5.7级地震是北西向永宁断裂正断为主活动的结果。该断裂在影像上线性延伸,断层崖发育,其晚第四纪活动性对建立区域新构造变形模式的意义有待进一步研究。In this paper,we analyse focal mechanism solution of the June 24,2012 Ninglang-Yanyuan MS5.7 earthquake,distribution feature of aftershocks and disaster distribution of the main earthquake.Then,combining with regional distribution characteristics of the quaternary strata,regional geological structural characteristics and three-dimensional satellite remote sensing image,we proposed that the June 24,2012 Ninglang-Yanyuan MS5.7 earthquake is the result of new activity of the North-West extension Yong-ning fault.The Yong-ning fault is of linear extension in image,fault scarp development,the late Quaternary activity and the significance in regional tectonic deformation of the Yong-ning fault needs more study.

关 键 词：宁蒗—盐源5.7级地震 地震构造 永宁断裂 震源机制解 余震分布 震害分布 

分 类 号：P315[天文地球—地震学]