基于H-C方法的地震断层面快速识别方法研究——以2021-05-22青海玛多MS7.4地震为例  

Quick Fault-Plane Identification by H-C Method:Application to the Maduo, Qinghai M_(S)7.4 Earthquake on 22 May,2021

作　　者：杨彦明[1] 刘兴盛 任静[3] 戴勇[1] 张云 赵文舟[4] YANG Yanming;LIU Xingsheng;REN Jing;DAI Yong;ZHANG Yun;ZHAO Wenzhou(Earthquake Agency of Inner Mongolia Autonomous Region,Hohhot 010010,China;Network Information Center,Emergency Management Department of Qinghai Province,Xining 810001,China;China Earthquake Networks Center,Beijing 100045,China;Shanghai Earthquake Agency,Shanghai 200062,China)

机构地区：[1]内蒙古自治区地震局,呼和浩特市010010 [2]青海省应急管理厅信息中心,西宁市810001 [3]中国地震台网中心,北京市100045 [4]上海市地震局,上海市200062

出　　处：《大地测量与地球动力学》2022年第6期551-558,共8页Journal of Geodesy and Geodynamics

基　　金：内蒙古自治区地震局局长基金重点项目(2020TM04);中国地震局地震应急青年重点任务(CEA_EDEM-202103);中国地震局地震科技星火计划(XH200501)。

摘　　要：基于震后各机构给出的玛多M_(S)7.4地震震源机制解,利用震源-矩心(H-C)方法对地震发震断层进行快速判断,在不需要参考余震情况下,快速识别地震破裂方向。18组测定结果均显示,NWW走向的节面Ⅰ为发震断层面。综合利用震源区地质构造特征、震后余震序列分布、区域构造应力场、烈度等震线以及野外地质考察结果,验证断层测算结果的准确性,最终推断玛多M_(S)7.4地震断层面为NWW走向的节面Ⅰ、昆仑山口-江错断裂为发震断层,震源机制解显示是一次以左旋走滑为主的地震事件。Based on the focal mechanism solutions of Maduo M_(S)7.4 earthquake given by various institutions after the earthquake,the H-C method is used to quickly judge the seismogenic fault,and quickly identify the seismic rupture direction without reference to aftershocks.The 18 sets of results show the nodal plane I with NWW-trending is the seismogenic fault plane.For validating the results,according to the characteristics of geologic structure in seismic source area,space distribution of aftershock sequence,regional tectonic stress field,isoseismal of seismic intensity,initial findings from field geological survey,we conclude that the Maduo earthquake shows strike-slip mechanism and the nodal plane I with NWW-trending is inferred from the seismogenic fault plane,and the Kunlun-Jiangcuo fault is the seismogenic structure.

关 键 词：玛多地震 震源-矩心(H-C)方法 震源机制中心解 发震构造 青藏高原 

分 类 号：P315[天文地球—地震学]