| 广西北流与靖西地区地震的应力触发现象分析 |
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| 引用本文： | 董非非,邓辉,姜辉.广西北流与靖西地区地震的应力触发现象分析[J].西北地震学报,2022,44(6):1441-1449. |
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| 作者姓名： | 董非非 邓辉 姜辉 |
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| 作者单位： | 江西省地震局,江西 南昌 330096;中国地震局 地球物理研究所,北京 100081 |
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| 基金项目： | 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) |
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| 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.
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| 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 |
Stress-triggering phenomenon of earthquakes in the Beiliu and Jingxi areas of Guangxi Province |
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| DONG Feifei,DENG Hui,JIANG Hui.Stress-triggering phenomenon of earthquakes in the Beiliu and Jingxi areas of Guangxi Province[J].Northwestern Seismological Journal,2022,44(6):1441-1449. |
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| Authors: | DONG Feifei DENG Hui JIANG Hui |
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| Institution: | Jiangxi Earthquake Agency,Nanchang 330096 ,Jiangxi,China; Institute of Geophysics,CEA,Beijing 100081 ,China |
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| Abstract: | In 2019,the Beiliu M S 5.2 and Jingxi M S 5.2 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 MS 4.2 foreshock to its MS 5.2 mainshock,Jingxi M S 5.2 mainshock to its MS 4.3 aftershock,and Beiliu MS 5.2 earthquake to the Jingxi MS 5.2 earthquake were calculated.The results show the following: The Beiliu MS 4.2 foreshock may have an obvious dynamic and static stress-triggering effect on the MS .2 mainshock.The Jingxi MS 5.2 mainshock may have a dynamic stress-triggering effect and static Coulomb stress-restraining effect on the MS 4.3 aftershock.The occurrence of the Jingxi MS 4.3 aftershock may be the result of the combined action of the tectonic stress field and dynamic stress triggering of the MS 5.2 mainshock.Because of the small magnitude and long distance,the Coulomb stress-triggering effect of the Beiliu MS 5.2 earthquake on the Jingxi MS 5.2 earthquake is not obvious. |
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