2021年9月4日新疆皮山M_(S)5.1地震震群序列及趋势分析  

SWARM SEQUENCE AND TREND ANALYSIS OF XINJIANG PISHAN M_(S)5.1 EARTHQUAKE ON SEPTEMBER 4,2021

作　　者：张琳琳[1] 聂晓红[1] 向元[1] 高荣[1] ZHANG Lin-lin;NIE Xiao-hong;XIANG Yuan;GAO Rong(Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China)

机构地区：[1]新疆维吾尔自治区地震局,新疆乌鲁木齐830011

出　　处：《内陆地震》2021年第4期309-318,共10页Inland Earthquake

基　　金：新疆维吾尔自治区重点研发计划项目(2020B03006-3);新疆地震科学基金(202104)。

摘　　要：介绍2021年9月4日新疆皮山M_(S)5.1和9月5日新疆叶城M_(S)5.0两次地震的震源和序列参数等资料,分析地震序列活动特征、序列参数以及序列类型,并与历史地震序列进行对比分析。结果表明:(1)2次5级地震前,震区发生多次MS≥3.0中小地震活动,形成前震序列。对主震与次大地震间的震级差和主震占整个序列的能量比分析认为,该地震序列属于"前-主-余"型震群。(2)地震序列的P值、b值和h值等参数的变化特征显示,此次地震的余震序列衰减正常。(3)地震前,西昆仑地区存在3项地震学异常,目前仍存在一些地震学异常。In the current paper,aiming to obtain the seismicity characteristics,parameters and type of the earthquake sequence for the M_(S)5.1 earthquake in Pishan on September 4 and the M_(S)5.0 earthquake in Yecheng on September 5,2021,based on the source parameters and precise location of the two earthquakes,and compared with the historical earthquake sequence.The results show that:(1)Many medium and small earthquakes of M_(S)≥3.0 occurred in the earthquake area before the two M5.0 earthquakes,which formed the foreshock sequence,the analysis of the magnitude difference between the main earthquake and the minor earthquake and the energy ratio of the main earthquake to the whole sequence and magnitude difference between the main earthquake and the minor earthquake present that:the earthquake sequence belongs to"Foreshock-Mainshock-Aftershock"type swarm.(2)The variation characteristics of P,b and h values of seismic sequence indicates that the aftershock sequence attenuation of this earthquake is normal.(3)There were 3 seismological anomalies in the west of Kunlun area before the earthquake,however,there are still seismological anomalies.

关 键 词：皮山M_(S)5.1地震 叶城M_(S)5.0地震 序列特征 趋势分析 

分 类 号：P315.7[天文地球—地震学]