利用震源机制判别山西地区地震事件类型  

Using Focal Mechanism to Distinguish Types of Earthquake Events in Shanxi

作　　者：殷伟伟[1,2] 张蕙[1,2] YIN Weiwei;ZHANG Hui(Shanxi Earthquake Agency,69 Second Section of Jiujinci Road,Taiyuan 030021,China;National Continental Rift Valley Dynamics Observatory of Taiyuan,Jinci Town,Taiyuan 030025,China)

机构地区：[1]山西省地震局,太原市030021 [2]太原大陆裂谷动力学国家野外科学观测研究站,太原市030025

出　　处：《大地测量与地球动力学》2021年第8期846-852,共7页Journal of Geodesy and Geodynamics

基　　金：山西太原大陆裂谷动力学国家野外科学观测研究站项目(NORSTY20-13);山西省科技厅青年基金(201801D221044);山西省地震局项目(SBK-2034,SBK-2023,SBK-1922)。

摘　　要：采用gCAP方法反演2010~2019年山西地区87次天然地震、18次塌陷及9次爆破的全矩张量解。结果显示,gCAP方法在反演山西地区震源机制方面效果较好。2016-03-12山西盐湖M L4.8地震的断层错动方式为走滑兼正断,全矩张量解中包含非双力偶成分,属于体积缩小的内向闭合型破裂。对于山西地区的地震事件,可将全矩张量解中双力偶分量占比是否大于80%作为判别天然地震及非天然地震的依据。对于非天然地震事件,当参数ζ>0时为外向爆炸源,反之为内向闭合源。Using the gCAP method,we determine several full moment tensor solutions of 87 natural earthquakes,18 collapse events and 9 blasting events that occurred from 2010 to 2019 in Shanxi.The results show that the gCAP method has a good effect in inverting the focal mechanism solution in Shanxi.The fault movement of Yanhu M L4.8 earthquake in Shanxi on March 12,2016 was strike-slip and normal fault,which is an inward closed fracture with reduced volume,having an obvious non-double-couple component.Whether the proportion of dual-couple components in the full moment tensor solution of earthquake events in Shanxi is greater than 80%can be used as a basis for distinguishing between natural earthquakes and non-natural earthquake events.For non-natural earthquake events,when the parameterζ>0,it is an outward explosion source,on the contrary,it is an inward closed source.

关 键 词：震源机制 gCAP 全矩张量解 非天然地震 判别 

分 类 号：P315[天文地球—地震学]