基于GPS技术研究新疆巴楚—伽师6.8级地震的地壳形变特征  

Study on Characteristics of Crustal Deformation of the Bachu-jiashi M_S6.8 Earthquake in Xinjiang Based on GPS Technique

作　　者：王晓强[1] 江在森[2] 杨国华[3] 李杰[1] 杨少敏[4] 

机构地区：[1]新疆维吾尔自治区地震局,乌鲁木齐830011 [2]中国地震局地震预测研究所,北京100036 [3]中国地震局第一监测中心,天津300180 [4]中国地震局武汉地震研究所,武汉430071

出　　处：《地震研究》2009年第2期175-181,共7页Journal of Seismological Research

基　　金：新疆维吾尔自治区科学研究与技术开发(含攻关)计划(200741121);"十五"国家重点科技攻关项目子专题(2004B601B01-02-01);中国地震局科技支撑计划子专题(2006BAC01B-03-01-01)资助

摘　　要：利用多期流动GPS观测成果及乌什、塔什库尔干GPS站连续观测资料结果,对2003年2月24日巴楚—伽师6.8级地震前后的地壳形变特征进行了讨论。认为震前震中附近各点以15～20mm左右的速率向NNW或NNE方向运动并在震中及邻近地区产生高剪应变值集中区,震后震中附近各点运动速率却减为几毫米;震前出现的高剪应变值集中区震后消失。同时乌什、塔什库尔干GPS连续观测站时间序列在震前2～3月也表现出大幅度突跳。We discussed the characteristics of crustal deformation before and after the Ms6.8 BaChu-JiaShi earthquake, using multiple mobile GPS observation results and continuous observation results in WuShi, Taxkorgan GPS stations. We believe that each point near the epicenter moves to the NNW or NIXIE direction with the velocity of 15- 20mm before the earthquake, which engendering high shear strain concentration area in the epicenter and adjacent area. However, the moving velocity of each point near the epicenter decrease to several millimeters after the earthquake and high shear strain concentration area disappears. At the same time, the time series of Wushi Taxkorgan GPS continuous observation station appear wide-range sudden jump 2-3 months before the earthquake.

关 键 词：地壳运动 GPS 剪应变 巴楚-伽师6.8级地震 

分 类 号：P315.725[天文地球—地震学]