伽师强震群活动过程的应力触发作用研究  

Study on Stress Triggering during Activity Process of the Jiashi Strong Earthquake Swarm

作　　者：王琼[1] 王海涛[1] 

机构地区：[1]新疆维吾尔自治区地震局,乌鲁木齐市北京南路42号830011

出　　处：《中国地震》2007年第1期35-46,共12页Earthquake Research in China

基　　金：新疆科技攻关项目(200333116);国家"十五"科技攻关项目(2004BA601B01-04-01)联合资助。

摘　　要：2003年2月24日位于1997～1998年伽师震区东南约20km的新疆巴楚-伽师地区发生了Ms6．8地震，其余震丰富、强度大。1997—1998年伽师强震群的发生是否会对2003年巴楚-伽师Ms 6．8地震产生触发作用？ 1996年阿图什发生Ms 6．7地震，时隔10个月距其70km处又发生了伽师强震群，1996年阿图什地震的发生是否有利于1997-1998年伽师强震群的发生？1997-1998年伽师震区接连发生9次6级以上地震，伽师强震群中各强震之间会产生怎样的影响？针对上述问题，本文结合伽师周围地区地震活动特征分析研究了自1996年阿图什Ms 6．7地震及1997～1998年伽师强震群至2003年巴楚-伽师Ms 6．8地震在整个伽师强震群活动过程中的应力触发作用。研究结果表明：1996年阿图什Ms 6．7地震在一定程度上有利于1997—1998年伽师强震群的发生；伽师强震群中先发生的6级地震产生的累加静态库仑破裂应力变化对后续6级地震有一定触发作用；1997—1998年伽师强震群折合为1次地震产生的静态库仑破裂应力变化表明，其对2003年巴楚-伽师Ms 6．8地震触发作用明显。The Bachu-Jiashi earthquake of Ms6.8 occurred on Feb.24, 2003, in Xinjiang, which is 20km from the southeast Jiashi seismic region in 1997 - 1998, and its aftershocks are rich and strong. The 1997 - 1998 Jiashi strong earthquake swarm will trigger Bachu-Jiashi earthquake of Ms6.8？ The Atushi earthquake of Ms6.8 occurred in 1996, and the 1997 - 1998 Jiashi strong earthquake swarm occurred 10 months later about 70km from Atushi earthquake. The Atushi earthquake of Ms6.7 is encouraging the 1997 - 1998 Jiashi strong earthquake swarm？ The 9 earthquakes with Ms6.0 successively from 1996 to 1997 in the Jiashi seismic region, how do they act on each other？ To answer the question above, the article studies the triggering of activity process of the whole Jiashi earthquake swarm from the 1996 Atushi earthquake of Ms6.7, 1997 - 1998 Jiashi strong swarm and the 2003 Bachu-Jiashi earthquake of Ms6.8, with analyzing seismicity characteristics around the Jiashi region. The result shows that the 1996 Atushi earhquake of Ms6.7 encouraged the 1997 - 1998 Jiashi strong swarm to some extent, and the cumulative Coulomb stress change from the previous M6.0 earthquakes of the Jiashi strong swarm triggered the following M6.0 events to some extent, and the Coulomb stress change from the converted Jiashi strong swarm encouraged remarkable 2003 Bachu-Jiashi earthquake of Ms6.8.

关 键 词：伽师强震群 静态库仑破裂应力变化 应力触发 

分 类 号：P315[天文地球—地震学]