广西靖西M^(S)5.2地震活动特征、影响场及应急对策

Active Characteristics,Impact Field and Emergency Response of the Guangxi Jingxi M^(S)5.2 Earthquake

对2019年11月25日靖西5.2级地震进行总结,认为靖西5.2级地震的发生标志华南地区地震活动持续增强。分析靖西5.2级地震地质背景、地震序列、震源机制、强震动记录、地震灾害,了解靖西5.2级地震活动特征、影响场,结果表明:靖西5.2级地震是主-余型地震,空间上呈NEE向优势分布;主破裂面走向为NEE,呈逆冲性质,下雷-灵马断裂为发震断裂;震前存在中期、短期地震活动性异常;地震最大烈度Ⅵ度。为该地区强震震后趋势判断、强震应急响应提供依据。最后概述地震前后的应急对策并提出对此次地震指示意义的思考。

This paper summarized the Guangxi Jingxi M^(S)5.2 earthquake on November 25,2019,and found that the occurrence of the M^(S)5.2 Jingxi earthquake may be a mark of the continuous increase of seismicity in South China.The geological background,earthquake sequence,focal mechanism,strong motion record,earthquake disaster of the Jingxi M^(S)5.2 earthquake were analyzed to understand the characteristics and influence field of Jingxi 5.2 earthquake activity.The result shows that the Jingxi M^(S)5.2 earthquake is an main-aftershock type earthquake,the spatial distribution direction is NEE;the strike direction of the main fracture surface is NEE,it is thrust type;the Xialei Lingma fault is the seismogenic fault of the earthquake;there are medium-term and short-term seismicity anomalies before earthquakes;the maximum intensity of earthquake isⅥ.The study may provide basis for the trend judgment and strong earthquake response after the strong earthquake in this area.Finally,the emergency countermeasures before and after the earthquake are summarized and the significance of this earthquake indication is also discussed.