2003年2月24日新疆巴楚—伽师M_S6.8地震的应力触发作用研究

英文篇名：Research on Stress Triggering of Bachu-Jiashi M_S6.8 Earthquake on Feb.24,2003,in Xinjiang
中文刊名：西北地震学报
英文刊名：Northwestern Seismological Journal
作者：王海涛 ; 王琼 ; 赵翠萍
英文作者：WANG Hai-tao1 ; 2 ; WANG Qiong2 ; ZHAO Cui-ping2(1.Lanzhou Base of Institute of Earthquake Prediction ; CEA ; Lanzhou 730000 ; China ; 2.Earthquake Administration of Xinjiang Uygur Autonomous Region ; CEA ; Urumqi 830011 ; China)
中文关键词：静态库仑破裂应力 ; 巴楚—伽师MS6.8地震 ; 应力触发
英文关键词：Static coulomb rupture stress ; Bachu-Jiashi M_S6.8 earthquake ; Stress triggering
出版日期：2006-12-30
机构：中国地震局预测研究所兰州科技创新基地,新疆维吾尔自治区地震局,新疆维吾尔自治区地震局甘肃兰州730000,新疆维吾尔自治区地震局,新疆乌鲁木齐830011,新疆乌鲁木齐830011,新疆乌鲁木齐830011
年：2006
期：04
出版单位：西北地震学报

摘要

自1997-1998年新疆伽师强震群后,伽师震区余震活动渐趋平静。2003年1月4日伽师发生了5.4级地震,其后50天在距其20km左右在巴楚-伽师地区发生了MS6.8地震,其后发生了7次MS5.0以上强余震,序列的余震丰富、强度大。通过计算几次强余震破裂面上产生的静态库仑破裂应力变化,结合余震活动的时空演化特征定量探讨了强余震活动的可能机理。结果表明,巴楚-伽师MS6.8地震不仅有利于分布与主破裂面方向较一致的余震发生,而且触发了与其共轭方向的地震活动。
Since the last M_S6 earthquake event in 1997 to 1998 Jiashi strong earthquake swarm,the seismicity in this region tended to quiet.Then occurred Jiashi M_S5.4 earthquake on Jan.4,2003, and Bachu-Jiashi M_S6.8 earthquake about 20 km far from the M_S5.4 earthquake 50 days later.After that 7 strong aftershocks(M_S≥5.0) followed it,and the aftershocks of the sequence are richer and strong.By calculating static Coulomb rupture stress changes of the mainshock acting on the rupture surfaces of strong aftershocks,combining spatial and temporal characters of aftershock evolution,the quantitatively possible mechanism of the strong aftershock activity is discussed.The result shows that Bachu-Jiash M_S6.8 earthquake not only encouraged saftershock occurring,whose direction of epicenter distribution is consistent with main rupture surface,but also triggered seismicity in the conjugated direction of the main rupture surface.

引文

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