昆仑山口西Ms8.1地震同震形变场的模拟分析  

SIMULATION AND ANALYSIS OF COSEISMIC DEFORMATION FIELD OF Ms8.1 EARTHQUAKE IN WEST TO KUNLUN MOUNTAIN PASS

作　　者：张晓亮[1] 江在森[2] 张希[1] 赵永年[1] 朱桂芝[1] 

机构地区：[1]中国地震局第二监测中心,西安710054 [2]中国地震局地震预测研究所,北京100036

出　　处：《大地测量与地球动力学》2007年第2期16-21,共6页Journal of Geodesy and Geodynamics

基　　金：地震科学联合基金(603002);"十一五"国家科研计划支撑项目(2006BAC01B02-02-03)

摘　　要：利用弹性有限元方法,结合GPS观测资料,模拟了昆仑山口西Ms8.1地震产生的同震水平位移场,计算了同震视应变变化场及主要活动断裂的同震错动。结果显示:1)昆仑大震对整个中国西部形变场影响非常明显,在发震断裂两侧一定区域内形成了一个主压应变高值区;2)大震使新疆东部与新甘交界部形成强烈的顺时针旋转,触发了玉门5.9级、石河子5.4级地震,同时使阿尔金断裂形成强烈的分段差异运动特性;3)大震使青藏块体东北缘运动几乎整体反向,在德令哈周围、青藏块体东北缘的东部积累了部分应变能;4)大震对川、藏交接部影响较大,同震时积累了一些应变能。The coseismic horizontal displacement field caused by the Kunlun Mountain Ms8.1 earthquake is simulated by use of elastic finite element method and GPS observations, the coseismic apparent strain variation field and the coseismic dislocation of main active faults are calculated. The results show ： 1 ） the effect of Kunlun Mountain Ms8.1 earthquake is very obvious on the west strain field of China, and a principal compressive strain area of high value has been formed near the seismogenic fault at the same time ;2） the great earthquake made the east of Xinjiang area and the joint part of Xinjiang and Gansu strongly clockwise rotate, it triggered Yumen MsS. 9 and Shihezi Ms5.4 earthquakes, and made Arjin fault display strong differential motion in different segments;3 ）the earthquake made the movement of almost the northeastern margin of Qinghai-Tibet block, some strain energy was accumulated in Dlha＇ s adjacent area and the east of northeastern margin of Qinghai-Tibet reversally ; 4） the effect of the great Kunlun Mountain earthquake is big on the joint part of Sichuan and Tibet, where some strain energy was accumulated while earthquake occurred.

关 键 词：昆仑山口西MS8.1地震 有限元方法 同震水平位移场 视应变变化场 青藏块体 

分 类 号：P315.725[天文地球—地震学]