利用长周期体波反演2003年伽师6．8级地震及其前后中小地震矩张量  

Using Long Period Body Wave to Inverse Moment Tensors of Xinjiang Jiashi M6.8 Earthquake in 2003 and Mid-small Earthquake before and after the Earthquake

作　　者：屠泓为[1] 王海涛[2] 赵翠萍[3] 罗国富[4] 

机构地区：[1]青海省地震局,西宁810001 [2]新疆维吾尔自治区地震局,乌鲁木齐830011 [3]中国地震局地震预测研究所,北京100036 [4]宁夏回族自治区地震局,银川750001

出　　处：《地震研究》2008年第1期7-13,共7页Journal of Seismological Research

基　　金：青海省地震科学基金(2006-98-A05);中国地震台网中心(120302-0957-03);中国地震局地震科学联合基金(104001)资助

摘　　要：选用了喀什和乌什两个数字地震台站所记录的数字波形资料，对2003年2月24日新疆伽师6．8级强震及其前后发生的一系列中小地震（2001～2004年发生的108个地震）的矩张量解进行了反演，计算出了其中67个地震的震源机制解，与哈佛大学及USGS给出的结果较一致。对结果分析发现：强震发生之前，中小地震分布比较分散，强震发生之后地震分布主要集中在主震的周围；中小地震地震断层性质在强震发生之前以走滑和正断层为主，在强震发生之后以走滑和逆断层为主；强震之后该区域主要仍受着南面块体的近南北向水平挤压。M6.8 strong earthquake took place in Xinjiang Jiashi on February 24 of 2003. The digital wave form data recorded in Kashi and Wushi stations are selected to inverse the moment tensor solutions for the strong earthquake and the mid-small earthquakes before and after the event （108 earthquakes in 2001-2004）. 67 focal mechanism solutions have been calculated, which is agreed with the ones of Harvard University and USGS. The analysis discovers that before the strong earthquake, the mid-small earthquake distribution is disperse, and after the event the distribution of the earthquakes mainly concentrated around the main shock. Before the strong earthquake the property of the mid-small seismic fault takes strike-slip and normal fault and after the event it takes strike-slip and thrust fault. After the strong earthquake this region is mainly squeezed by near NS horizontal force from the southern block.

关 键 词：长周期体波 地震矩张量反演 可靠性分析 新疆伽师 

分 类 号：P315.2[天文地球—地震学]