【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。更多还原

【Abstract】 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.更多还原