2022年门源M_(S)6.9地震序列特征及强余震判定  

Characteristics of the 2022 Menyuan M_(S)6.9 earthquake sequence and prediction of its strong aftershocks

作　　者：余娜[1] 张晓清[1] 胡维云 YU Na;ZHANG Xiaoqing;HU Weiyun(Qinghai Earthquake Agency,Xining 810000,China)

机构地区：[1]青海省地震局,西宁810000

出　　处：《地震地磁观测与研究》2022年第4期15-22,共8页Seismological and Geomagnetic Observation and Research

基　　金：青海省科技成果转化专项(项目编号:2021-SF-151)。

摘　　要：2022年1月8日青海门源发生M_(S)6.9地震,基于青海地震台网对此次地震序列时空演化特征进行分析。结果表明,门源地震序列的空间展布整体上呈西段NWW、东段SE向的带状分布,且序列衰减较缓慢。另外,基于同一构造历史地震类比、h值、等待时间法等进行分析,认为门源M_(S)6.9地震序列为主—余型;根据祁连地震带中东段5级以上地震最大余震发震时间统计和震级差特征分析认为,门源M_(S)6.9地震的最大余震已经发生,即2022年1月12日18时20分的M_(S)5.2地震。On January 8,2022,an earthquake with magnitude of 6.9 struck Menyuan city of Qinghai,and we analyze the temporal and spatial evolution characteristics of sequence using data recorded by Qinghai Earthquake Network.Results show that the distribution of Menyuan earthquake sequence is NWW of the west segment,southeast of the east segment to the zonal distribution,and the sequence decays slowly.Through comparing with historical earthquake sequences in the same tectonic,analyzing by the method of h-value and the method of dt-t,we determine that the Menyuan M_(S)6.9 earthquake sequence belongs to mainshock-aftershock type.According to the statistics of the original time of the strongest aftershock of historical earthquakes in Qilian seismic belt and the distribution characteristics of the magnitude differences,we conclude that the strongest aftershock of the Menyuan M_(S)6.9 earthquake has occurred,which is the M_(S)5.2 earthquake at 18:20 on January 12,2022.

关 键 词：门源M_(S)6.9地震 地震序列 强余震 

分 类 号：P315[天文地球—地震学]