昆仑8.1级地震对青藏高原东北缘地壳形变场的影响  

EFFECT OF KUNLUN Ms 8.1 EARTHQUAKE ON CRUSTAL DEFORMATION IN NORTHEASTERN MARGIN OF QINGHAI-TIBET PLATEAU

作　　者：崔笃信[1] 王庆良[1] 王文萍[1] 

机构地区：[1]中国地震局第二监测中心,西安710054

出　　处：《大地测量与地球动力学》2008年第3期1-8,共8页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(40674057);地震科学联合基金(A07132)

摘　　要：根据震源区及其附近地震前后的形变观测数据以及震后考察结果,用Okada模型反演发震断层模型参数,模拟2001年11月14日昆仑8.1级地震的同震位移,获得扣除同震形变后的速度场。结果表明:1)昆仑8.1级地震对青藏高原东北缘西部地壳变形影响显著,同震位移在德令哈一带可达40mm左右;2)用这种方法得到的速度场比GPS原始速度场能更真实地反映地震后区域地壳运动状态和应变状态。The seismic fault parameters can be inversed with Okada model based on the deformation data before and after earthquakes in the focal region and its adjacent area. Co-seismic displacements are simulated by use of these parameters and then the regional velocity field is obtained by deducting the co-seismic displacements from the GPS observation displacements. We processed and analyzed the data in northeastern margin of the Qinghai-Tibet plateau observed during 2001 -2003 in two steps： firstly, simulated the displacements generated by Kunlun Ms 8.1 earthquake occurred in 2001 in this region, and then obtained the horizontal crustal velocity field by deducting the co-seismic displacements. The results reveal ： 1 ） the effect of Kunlun Ms8.1 earthquake on the northeastern margin of Qinghai-Tibet plateau is obvious; 2） the velocity field obtained with this method is better than the original GPS velocity field for reflecting the status of regional crustal movements and strain.

关 键 词：青藏块体东北缘 同震位移 GPS速度场 昆仑8.1级地震 地壳运动 

分 类 号：P315.725[天文地球—地震学]