2016年山西运城M_(L)4.8地震序列精定位分析  

Analysis of seismic relocation of Shanxi Yuncheng M_(L)4.8 earthquake sequence

作　　者：王卓君[1] 蔡妍[2] 张娜 任力伟[1] WANG Zhuojun;CAI Yan;ZHANG Na;REN Liwei(Shanxi Earthquake Agency,Taiyuan 030021,China;Institute of Geophysics,China Earthquake Administration,Beijing 100081,China)

机构地区：[1]山西省地震局,中国太原030021 [2]中国地震局地球物理研究所,中国北京100081

出　　处：《地震地磁观测与研究》2021年第6期36-41,共6页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局监测、预报、科研三结合课题(项目编号:3JH-201901065)。

摘　　要：利用双差地震定位方法,联合山西测震台网和河南测震台网共81个地震台站的震相观测报告,对2016年山西运城M_(L)4.8地震序列进行重新定位,得到395次地震的精定位结果。结果显示,地震序列震中分布更加集中,优势分布方向NNW,且震源深度集中分布在4—10 km。参考主震的震源机制解,推断此次运城M_(L)4.8地震序列发震断裂为盐湖北岸龙居镇附近的NNW向隐伏断裂。发震断层剖面显示:发震断层具有高倾角,倾向偏NE;主震及较大余震集中分布在断层南端,震源深度8—11 km;沿断层展布方向,地震震源深度由南向北逐渐变浅。By using the double-difference earthquake location method,combined with the seismic phase observations of 81 stations in Shanxi and Henan networks,the Shanxi Yuncheng M_(L)4.8 earthquake sequence is relocated,and 395 earthquake relocation results are obtained.Results show that the earthquake epicenter distribution is more concentrated,the earthquake dominant distribution direction is NNW,the focal depths concentrate in 4-10 km.Referring to the focal mechanism solution of the mainshock,we conclude the seismogenic fault is an NNW buried fault near Longju Town on the north shore of the salt lake.The fault profles show that the seismogenic fault has a high inclination angle,and slightly is inclined to NE.The main shock and large aftershocks are concentrated in the depth range of 8-11 km at the southern end of the fault.Focal depths gradually become shallower from south to north along the direction of the fault.

关 键 词：运城M_(L)4.8地震序列 双差定位 地震精定位 震源深度 隐伏断裂 

分 类 号：P315[天文地球—地震学]