基于CWI方法的门源M_(S)6.9地震余震定位研究  

Relocation of aftershocks of the 2022 Menyuan,Qinghai,M_(S)6.9 earthquake based on the CWI method

作　　者：张胜霞 尹欣欣 王祖东 陈晓龙 蒲举 王树旺 鞠慧超 李阳阳 王维欢 ZHANG Shengxia;YIN Xinxin;WANG Zudong;CHEN Xiaolong;PU Ju;WANG Shuwang;JU Huichao;LI Yangyang;WANG Weihuan(Gansu Lanzhou Geophysics National Observation and Research Station, Lanzhou 730000, Gansu, China;Gansu Earthquake Agency, Lanzhou 730000, Gansu, China)

机构地区：[1]甘肃兰州地球物理国家野外科学观测研究站,甘肃兰州730000 [2]甘肃省地震局,甘肃兰州730000

出　　处：《地震工程学报》2022年第2期468-474,共7页China Earthquake Engineering Journal

基　　金：兰州地球物理国家野外科学观测研究站(2021Y08);甘肃省科技计划资助(21YF5FA031);中国地震局地震预测研究所基本科研业务专项(2020IESLZ01)。

摘　　要：门源发生M_(S)6.9地震后,余震目录中含有大量的单台事件,为了解决单台事件的定位不准确性,利用尾波干涉(CWI)的震源定位方法将门源台记录到震后8小时内的101次单台事件进行重定位,该方法主要通过计算事件对尾波部分的间距不确定性矩阵,从而估计聚类中具有相似震源机制的地震事件对之间的间距,通过优化这些事件对的间距来解决聚类中一组事件的相对位置。最后,对定位结果进行评估,得到相对可靠的定位结果。After the Menyuan M_(S)6.9 earthquake occurred on January 8,2022,the aftershock catalogue contains a large number of single-station events.To solve the inaccuracy of single-station event location,this paper used the source location method of coda wave interference(CWI)to relocate 101 single-station events recorded by Menyuan station within 8 hours after the mainshock.First,we calculated the interval uncertainty matrix of the coda wave part of the event pair,so as to estimate the interval between the seismic event pairs with similar focal mechanism in the cluster.Then,we solved the relative position of a group of events in the cluster by optimizing the interval.Finally,the relocation results were evaluated and found to be relatively reliable.

关 键 词：相对定位 尾波干涉 单台定位 地震监测 

分 类 号：P319.56[天文地球—固体地球物理学]