昆仑山口西Ms8.1地震的地壳变形特征  

CHARACTERISTICS OF CRUSTAL DEFORMATION RELATING TO Ms8.1 KUNLUNSHAN EARTHQUAKE

作　　者：乔学军[1] 王琪[1] 杜瑞林[1] 陈宗时[2] 游新兆[3] 谭凯[1] 

机构地区：[1]中国地震局地震研究所,武汉430071 [2]中国地震局第二地形变监测中心,西安710054 [3]中国地震局分析预报中心,北京100036

出　　处：《大地测量与地球动力学》2002年第4期6-11,共6页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金项目 (4 0 0 740 2 4) ;国家"十五"科技攻关项目 (2 0 0 1BA60 1B0 2 )

摘　　要：利用全球定位系统 1991～ 2 0 0 1年及震后 4期GPS观测数据 ,获得了 2 0 0 1年 11月 14日昆仑山口西地震 (Ms8.1)的同震和震后形变运动图像。跨破裂带GPS网最近两点测得的最大同震形变为 1.9m左右 ,而震后 4个月断层蠕滑引起的变形约为 80mm。破裂带两侧震后变形幅度具有非对称性 ,南侧震后变形基本是北侧的 2～ 3倍。研究结果显示破裂带南盘在震后向偏东方向有明显移动 ,预示本次地震后能量的重新分配与积累 ,根据近几十年以来东昆仑断裂带的大地震由西向东扩展的特点 ,未来地震有向东迁移的可能。The coseismic and post earthquake deformation velocities with \%M\%s 8.1 Kunlunshan earthquake occurred on Nov. 14, 2001 were calculated from the GPS data of 1991-2001 and 4 repeated GPS surveys after the event. The maximum coseismic and post earthquake changes are 1.9 m and 0.08 m respectively. From the result of post earthquake velocity, we inverse the crustal deformation characteristics of eastern Kunlun active fault with elastic dislocation model. It shows that the domain motion of eastern Kunlunshan fault is left lateral and strike slip. The eastward motion of the southern block of Kunlunshan fault implies the redistribution and reaccumulation of energy after the earthquake. According to the feature that strong earthquakes along Kunlunshan fault extended from west to east in recent decades coming earthquakes will possibilly move to eastern region.

关 键 词：地震 同震形变 震后形变 弹性位错模型 GPS网 全球定位系统 数据处理 

分 类 号：P315.725[天文地球—地震学]