根据余震资料求解2003年伽师M_S6.8地震断层面的研究  

Determination of Fault Plane for the 2003 Jiashi M_S6.8 Earthquake by using its Aftershocks

作　　者：赵晓燕[1] 武晔[1] 高方平[1] 黄骥超[2] 高家乙[1] 

机构地区：[1]防灾科技学院,北京东燕郊065201 [2]中国地震局兰州地震研究所,甘肃兰州730000

出　　处：《地震》2013年第3期133-139,共7页Earthquake

基　　金：2010年河北省教育厅科学研究计划项目(Z2010219);中央高校基本科研业务费专项资金创新项目(ZY20110101)共同资助

摘　　要：大地震发生后,大量余震在断层面及其附近发生。余震震源位置的空间分布可以较为精确地勾画出断层面的形状和位置。假定地震发震断层可以用一个平面来模拟,且设大多数余震发生在这个断层面的附近,则可以通过余震震源位置参数来求解发震断层的走向、倾角及位置。本文首次采用2003年2月24日新疆伽师MS6.8地震后精确定位的小震资料反演了伽师地震断层面的走向和倾角,并以此为基础求得了该断层面上的滑动角。并根据小震丛集性原则,尝试用数学方法先对反演所采用的数据进行筛选再进行反演,所得的结果精确程度更高,验证了这种做法的有效性。A lot of aftershocks will happen on and around the fault plane after big earthquakes.The spatial distribution of the aftershocks＇ position can precisely sketch the shape and position of the fault plane.Assuming that seismic fault can be simulated as a plane and most aftershocks would happen nearly around the fault plane,we can use the parameters of the aftershocks＇ position to estimate the strike,dip and position of the fault plane.We firstly use the aftershocks of the earthquake of MS6.8 occurring in Jiashi region,Xinjiang Uygur Autonomous Region on February 24,2003 to estimate the strike,dip and rake of the fault plane.According to the principle of the cluster of small earthquakes,we also try to use mathematical methods to screen data before inversing,and the more accurate inversion results validate the effectiveness of the proposed method.

关 键 词：地震断层面 应力场 精确定位 2003年伽师MS6 8地震 

分 类 号：P315.7[天文地球—地震学]