江苏天宁M_(S)4.2地震震源深度分析  

Focal depth analysis of the 2021 M_(S)4.2 earthquake in Tianning District Jiangsu Province

作　　者：霍祝青[1] 周文杰 立凯 钱婷 孙小航 何奕成 HUO Zhuqing;ZHOU Wenjie;LI Kai;QIAN Ting;SUN Xiaohang;HE Yicheng(Jiangsu Earthquake Agency,Nanjing 210014,China)

机构地区：[1]江苏省地震局,中国南京210014

出　　处：《地震地磁观测与研究》2023年第4期21-26,共6页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局地震应急与信息青年重点任务(项目编号:CEAEDEM202308);中国地震局地震星火科技计划项目(项目编号:XH23015A);江苏省地震局科技创新团队项目(项目编号:2022-01,2022-03,2022-04)。

摘　　要：应用不同地震定位方法,对2021年12月22日江苏天宁M_(S)4.2地震震源深度进行重新测定。使用NonLinLoc方法对地震进行绝对定位,得出震源深度为11.9 km。以绝对定位结果为初值,利用该区域范围内历史地震事件,使用双差定位法对地震进行重定位,得出震源深度为10.1 km。结合该地区构造环境等进行分析,认为震源深度为10—12 km相对合理。In this paper,different earthquake location methods were applied to re-determine the focal depth of the M_(S)4.2 earthquake in Tianning,Jiangsu,on December 22,2021.The NonLinLoc method is applied for absolute location of the earthquake,and resulting in a focal depth of 11.9 km.Using the absolute location result as the initial value and employing historical earthquake events within the region,the earthquake was relocated using the double-difference location algorithm yielding a focal depth of 10.1 km.By analyzing the tectonic environment of the region,the study concludes that a focal depth of 10-12 km is relatively reasonable.

关 键 词：2021年天宁M_(S)4.2地震 震源深度 NonLinLoc定位 双差定位 

分 类 号：P315.33[天文地球—地震学]