摘要
吴忠灵武地区中强以上地震活动具有频度高和灾害重的特点。本文以2021年7月至8月灵武3.6级震群为例,分析震群活动特点,回溯历史震群对应中强以上地震的震例,以及基于小震精定位结果,在吴忠灵武地区形成南北向小震剖面的稀疏段,结合低b值对该区域的危险性判定,综合分析认为2021年7月灵武震群已经对应2021年11月18日灵武4.0级地震。
The seismicity above medium intensity in Wuzhong-Lingwu area is characterized by high fre-quency and heavy disaster. Taking the Lingwu earthquake cluster of magnitude 3.6 from July to August 2021 as an example, this paper analyzes the activity characteristics of the earthquake cluster, recalls the historical earthquake clusters corresponding to earthquakes above moderate strength, and forms sparse sections of the north-south small earthquake profile in Wuzhong-Lingwu area, based on the fine location of small earthquakes. According to the comprehensive analysis, the July 2021 Lingwu earthquake cluster has corresponded to the Lingwu 4.0 earthquake on November 18, 2021.
