广西北流与靖西地区地震的应力触发现象分析  

Stress-triggering phenomenon of earthquakes in the Beiliu and Jingxi areas of Guangxi Province

作　　者：董非非 邓辉 姜辉 DONG Feifei;DENG Hui;JIANG Hui(Jiangxi Earthquake Agency,Nanchang 330096,Jiangxi,China;Institute of Geophysics,CEA,Beijing 100081,China)

机构地区：[1]江西省地震局,江西南昌330096 [2]中国地震局地球物理研究所,北京100081

出　　处：《地震工程学报》2022年第6期1441-1449,共9页China Earthquake Engineering Journal

基　　金：地震科技星火计划资助项目(XH19025Y);江西省防震减灾与工程地质灾害探测工程研究中心开放基金资助项目(SDGD202016)。

摘　　要：2019年广西相继发生北流5.2级和靖西5.2级地震,两次地震间隔仅一个多月,为广西陆区有地震记载以来之少见现象。分别计算广西北流4.2级前震对其5.2级主震、靖西5.2级主震对其4.3级最大余震,以及北流5.2级地震对靖西5.2级地震的库仑破裂应力变化作用大小。结果显示:北流4.2级前震对5.2级主震可能存在明显的动态与静态应力触发作用;靖西5.2级主震对4.3级最大余震地震可能存在动态应力触发作用和静态库仑应力抑制作用,靖西4.3级余震的发生可能是构造应力场和其5.2级主震动态应力触发共同作用的结果。由于震级较小且距离较远,北流5.2级地震对靖西5.2级地震的库仑应力触发作用不明显。In 2019,the Beiliu M5.2 and Jingxi M5.2 earthquakes occurred successively in Guangxi,China,with an interval of only one month,which is a rare phenomenon since earthquake records began in Guangxi.In this study,the Coulomb failure stress changes of the Beiliu M4.2 foreshock to its M5.2 mainshock,Jingxi M5.2 mainshock to its M4.3 aftershock,and Beiliu M5.2 earthquake to the Jingxi M5.2 earthquake were calculated.The results show the following:The Beiliu M4.2 foreshock may have an obvious dynamic and static stress-triggering effect on the M5.2 mainshock.The Jingxi M5.2 mainshock may have a dynamic stress-triggering effect and static Coulomb stress-restraining effect on the M4.3 aftershock.The occurrence of the Jingxi M4.3 aftershock may be the result of the combined action of the tectonic stress field and dynamic stress triggering of the M5.2 mainshock.Because of the small magnitude and long distance,the Coulomb stress-triggering effect of the Beiliu M5.2 earthquake on the Jingxi M5.2 earthquake is not obvious.

关 键 词：北流5.2级地震 靖西5.2级地震 库仑破裂应力变化 应力触发 

分 类 号：P319.56[天文地球—固体地球物理学]