摘要
Crust movement changed obviously in the northeastern margin of Tibetan Plateau zone according to GPS measurements during 2007—2009.This paper analyzed the coseimic effect and postseismic viscoelastic relaxation and afterslip effect respectively.The results show that some deformation was formed because of coseismic effect,but the postseismic viscoelastic relaxation and afterslip effect can be neglected.Some characteristics of postseismic short-term deformation can not be explained adequately by the deformation mechanics for China mainland,which belongs to multi-block system.To a large extent,the form of the characteristic of postseismic short-term deformation in the northeastern margin of Tibetan Plateau zone may be related to adjustment movement of blocks.