Abstract
Seismic fault parameters can be inversed with Okada model based on deformation data before and after earthquakes in focal region and its adjacent area. Co-seismic displacements can be simulated by using these parameters, and then regional velocity field obtained by deducting the co-seismic displacements from the observed displacements by GPS method. We processed and analyzed the data in the northeastern edge region of the Qinghai-Tibet plateau observed during 2001 – 2003 in two steps: firstly, the displacements generated by Kunlun M s8.1 earthquake of 2001 in this region was simulated, and secondly, deducted the co-seismic displacements from it and obtained the horizontal crustal velocity field. The results reveal: 1) the effect of Kunlun M s8.1 earthquake on crustal deformation in this region is significant; 2) the velocity field obtained with this method is better than the original GPS velocity field in reflecting the status of regional crustal movement and strain.
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