2019年10月12日广西北流-广东化州5.2级地震特征分析  

Characteristics of Huazhou-Beiliu MS 5.2 Earthquake on October 12^th,2019

作　　者：邓志辉[1,2] 刘吉平 吕金水[1] 叶东华 廖桂金[1] 王小娜[1,2] 刘锦[1] 刘特培[1] 李健梅 DENG Zhihui;LIU Jiping;LYU Jinshui;YE Donghua;LIAO Guijin;WANG Xiaona;LIU Jin;LIU Tepei;LI Jianmei(Guangdong Earthquake Agency,Guangzhou 510070,China;Southern Marine Science and Engineering Guangdong Laboratory,Zhuhai 519000,China)

机构地区：[1]广东省地震局,广州510070 [2]南方海洋科学与工程广东省实验室,广东珠海519000

出　　处：《华南地震》2020年第2期1-12,共12页South China Journal of Seismology

基　　金：国家自然科学基金项目(41604055,41676057);广东省科技计划项目(2019B020208014,2018B020207011);南方海洋科学与工程广东省实验室环南海地质过程与灾害项目(99147-42080024)联合资助。

摘　　要：2019年10月12日,在广东省化州市与广西壮族自治区北流市交界地区发生5.2级地震,这是华南地区进入20世纪以来第Ⅴ活跃幕之后发生的第3次5级以上地震,也是粤桂交界地区第Ⅴ活跃幕以来第2次5级以上地震。此地震发生北西向巴马-博白-茂名断裂带的陆川-高州段上,属6级潜在震源区,基本烈度为Ⅵ度区。震中区在历史上属于少震弱震区,但从2014年以来,地震活动出现间歇性增强,多项地球物理观测数据也时有异常表现。广东省地震局在2018年度地震会商时把此区域确定为2019年度地震危险重点注意地区。10月12日5.2级地震的发生验证了年度地震危险重点注意地区的判定,为以后的地震预测工作提供了可参考的分析依据。On October 12^th,2019,an Ms5.2 earthquake occurred at the junction of Huazhou City,Guangdong Province and Beiliu City,Guangxi Zhuang Autonomous Region,which is the third earthquake with Ms≥5 after the South China region entered the second active period and the fifth active scene,and is also the second earthquake with Ms≥5 since the fifth active scene in the border area between Guangdong and Guangxi.This earthquake occurred on the Luchuan-Gaozhou section of the Bama-Bobai-Maoming fault zone in the northwest direction,which is a potential source of magnitude 6 with a basic intensity ofⅥ.The epicentral area is a weak earthquake areahistorically,but since 2014,seismic activity has increased intermittently,and many geophysical observations also have anomalous performance.The Guangdong earthquake agency identified the area as a keyearthquake hazard area in 2019in the annual earthquake conference(2018).The occurrence of the Ms5.2 earthquake has verified the judgment of the key earthquake hazard areaof the year and provided a reference for the future earthquake prediction.

关 键 词：广西北流—广东化州地震 博白—茂名断裂 地震活动 流动重力 地下流体 井孔应变 

分 类 号：P315.7[天文地球—地震学]