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Title:: Discussion on the Seismogenic Structure Remote Sensing Interpretation of the Qinghai Menyuan M_S6.4 Earthquake in 2016

作者:: 李智敏¹; 黄帅堂²; 胡朝忠³; 杨攀新³; 1.青海省地震局,青海西宁 810001; 2.新疆维吾尔自治区地震局,新疆乌鲁木齐 830011; 3.中国地震局地震预测研究所,北京 100036

Author(s):: LI Zhimin¹; HUANG Shuaitang²; HU Chaozhong³; YANG Panxin³; 1. Earthquake Administration of Qinghai Province,Xining 810001,Qinghai,China2. Earthquake Administration of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China3. Institute of Earthquake Science,CEA,Beijing 100036,China

Keywords:: remote sensing; Lenglongling Fault; offset landforms; seismogenic structure; Menyuan earthquake

摘要:: 利用高分1号遥感影像和Googleearth影像数据,对2016年1月21日青海门源M_S6.4地震的发震构造(冷龙岭断裂系)相关的微地貌(水系、冲洪积扇、山脊等)开展遥感解译研究工作。研究结果表明:冷龙岭断裂具有典型的左旋走滑特征,晚更新世以来断裂发生过4期断层活动,从老至新位错量分别为45～65 m,22～52 m,13～27 m及7～10 m,说明该断裂具有较强的水平活动特性,但从位错量可以看出断层活动幅度逐渐减弱; 结合本次地震的余震分布和震源机制解,初步判定冷龙岭断裂是本次地震的控震构造,但发震构造可能为冷龙岭北侧的次级逆冲断层。

Abstract:: Using high score No.1 remote sensing image and Googleearth image data,we carried out the interpretation of remote sensing work of the micro-topography(river,alluvial fan,ridges etc. )of Lenglongling Fault which is the seismogenic tectonics of Menyuan M_S6.4 earthquake on Jan.21,2016. The study results have shown that the Lenglongling Fault has characteristics of typical left-lateral and strike-slip. The fault occurred 4 periods of fault activity since the late Pleistocene,and their displacement are 4 565 m,2 252 m,1 327 m and 710 m from the old to the new,which reflects the activity of fault is strong,but the amplitude of fault activity gradually decreases. Combined with aftershocks distribution and focal mechanism solutions,we judge that the Lenglongling Fault is the control structure of this earthquake,however,the seismogenic tectonics may be the secondary thrust north fault of Lenglongling Fault.