SEIS-CAP软件快速反演山西地区2016年3次ML>4.5地震震源机制解的研究  

Study on the Fast Inversion of Focal Mechanism Solutions of Three Earthquakes with>4.5 in Shanxi Province in 2016 by SEIS-CAP Software

作　　者：王卓君[1,2] 张玲 Wang Zhuo-jun;Zhang Ling(Shanxi Seismological Bureau, Taiyuan, Shanxi 030021, China;Taiyuan Continental Rift Dynamics National Field Scientific Observation and Research Station, Taiyuan, Shanxi 030025, China)

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

出　　处：《山西地震》2020年第4期8-13,36,共7页Earthquake Research in Shanxi

基　　金：山西省地震局科研课题(SBK-1918)。

摘　　要：选取山西测震台网记录的2016年发生在山西地区ML>4.5的3次地震波形数据和震相文件,通过SEIS-CAP软件对震中距200 km范围内,信噪比大于1.2的所有台站进行震源机制解快速反演。将此方法测定的震源机制解结果与经过台站挑选后得到的结果、其他学者对这3次地震测定的震源机制解结果进行对比分析。结果表明,对于山西地区ML>4.5的地震,在不做台站挑选的情况下,使用SEIS-CAP软件快速反演得到的震源机制解是可靠的。这3次盆地内部地震均发生于上地壳,可能与山西断陷盆地受剪切拉张作用,盆地下方地壳减薄,脆性破裂区变浅有关。3次地震的震源机制结果符合山西断陷带北东向挤压,北西向拉张的区域应力场特征。Seismic waveform data and seismic phase files recorded by shanxi seismograph network of three>4.5 earthquakes that took place in shanxi in 2016 were selected to perform a rapid inversion of focal mechanism solution for all stations within 200km away from the epicenter and with signal-to-noise ratio greater than 1.2 by SEIS-CAP software.The results of seismic source mechanism measured by this method are compared with those obtained by station selection,and the results of seismic source mechanism measured by other scholars.The results show that for the>4.5 earthquakes in shanxi area,the focal mechanism solutions obtained by fast inversion by SEIS-CAP software are reliable without station selection.These three internal earthquakes occurred in the upper crust,which may be related to the shear and tension action of the fault basin in Shanxi,the thinning of the crust beneath the basin and the shallowing of the brittle fracture zone.The focal mechanism results of the three earthquakes are consistent with the regional stress field characteristics of the north-eastward compression and NW tension of the Shanxi fault depression zone.

关 键 词：震源机制解 SEIS-CAP软件 山西地区 

分 类 号：P315.33[天文地球—地震学]