1950年以来帕米尔东北缘—西昆仑地区7级左右地震后新疆地区中强地震活动状态分析  

Moderate-strong Earthquake Activities in Xinjiang after M7 Earthquakes in the Northeast Edge of Pamir——West Kunlun Area Since 1950

作　　者：王琼[1] 聂晓红[1] 高朝军[1] 

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：《地震》2012年第1期93-102,共10页Earthquake

基　　金：2010年新疆地震局地震预报系统运维项目(1521031009);2011年度震情跟踪合同制定向工作任务(2011016501)联合资助

摘　　要：本文类比分析了1950年以来帕米尔东北缘—西昆仑地区7级左右地震发生后3年内新疆地区中强以上地震的活动状态,并进一步讨论了2008年于田7.3级和乌恰6.8级地震后新疆地区的地震活动特点。结果表明,1950年以来帕米尔东北缘—西昆仑地区7级左右地震发生后,新疆地区应变能释放相对较为充分,震后3年通常无6.5级以上强震发生;7级左右地震后3年新疆地区5级以上地震频度总体呈下降趋势,2008年于田7.3级地震后5级以上地震出现的活跃—平静的显著差异性活动特征与1974年乌兹别里山口7.3级地震和1996年喀喇昆仑山口7.1级地震后较为相似。此外,结合新疆地区强震活动的动力学环境作用和帕米尔东北缘—西昆仑地区7级左右地震的震源机制特征,初步探讨分析了该区7级左右地震后3年内新疆地区中强以上地震空间活动特征的可能成因。We analyze moderate-strong earthquake activities in Xinjiang within 3 years after earthquakes with magnitude 7 or so in the Northeast edge of Pamir--West Kunlun area since 1950, and discuss further seismic activity in Xinjiang after the 2008 Yutian Ms7.3 earthquake and Wuqia Ms6.9 earthquake. Our study shows that strain energy in Xinjiang released fully after the earthquakes with magnitude 7 or so since 1950 in the Northeast edge of Pamir--West Kunlun area, and no strong earthquake with magnitude over 6.5 oc curred within 3 years after these earthquakes with magnitude 7 or so; the annual frequency of Ms ≥5 earthquakes in Xinjiang appears downtrend within 3 years after these earthquakes with magnitude 7 or so, and the differential character of seismicity quiescence of Ms≥5 earthquakes after the 2008 Yutian Ms7. 3 earthquake is similar to that after the 1974 Ms7. 3 earthquake of Uzbel Mountain pass and the 1996 Ms7. 1 earthquake in the Karakorum Mountain pass. In addition, Combining dynamic condition of strong earthquake activities in Xinjiang and focal mechanism feature of the earthquakes of magnitude 7 or so in the Northeast edge of Pamir West Kunlun area , we discuss possible causes for spatial activity features of moderate-strong earthquakes in Xinjiang within 3 years after magnitude 7 or so earthquakes.

关 键 词：于田7.3级地震 中强地震 帕米尔东北缘-西昆仑地区 活动状态 

分 类 号：P315.7[天文地球—地震学]