Crustal Movement and Strain Model of Active Blocks Analyzed by GPS in Sichuan-Yunnan Region

Constrained by GPS from CMONOC between 1998 and 2004 in Sichuan-Yunnan region,based on geological division of blocks,we inverse the parameters of active blocks about their present-day crustal movement and deformation by rigid body model and movement and strain model separately.With the comparison of these two models by model identification,it is concluded that it is more proper to describe the properties of crustal movement of active blocks by movement and strain model in Sichuan-Yunnan region.Through the analysis of the movement of active blocks and main faults,the results showed that the characters of crustal movement can be represented by clockwise motion,weakened gradually from west to east and from north to south,and the main feature of crustal deformation is continuous and with gradient shear in Sichuan-Yunnan region.?