2019 年 10 月 12 日广西北流 — 广东化州 5.2 级地震特征分析-华南地震

文章信息/Info

Title:: Characteristics of Huazhou-Beiliu M_S 5.2 Earthquake on October 12^th, 2019

作者:: 邓志辉 1; 2; 刘吉平 1; 2; 吕金水 1; 叶东华 1; 廖桂金 1; 王小娜 1; 2; 刘锦 1; 刘特培 1; 李健梅 1; （ 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）

Author(s):: DENG Zhihui1; 2; LIU Jiping1; 2; LYU Jinshui1; YE Donghua1; LIAO Guijin1; WANG Xiaona1; 2; LIU Jin1; LIU Tepei1; LI Jianmei; （ 1.Guangdong Earthquake Agency, Guangzhou 510070,China;2.Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai 519000, China）

Keywords:: Huazhou-Beiliu earthquake; Bobai-Maoming fault; Seismic activity; Flowing gravity; Underground fluid; Borehole strain

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。

Abstract:: On October 12th ,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 of Ⅵ .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.