Motion Characteristics of Major Faults in East Boundary of Sichuan-Yunnan Block Obtained with GPS Data

Based on the GPS velocity field data from 1999-2007,we estimate velocity residuals and unbiassedness of rigid model,uniform strain model and linear strain model about block movement.Results show that block movement characteristics can be well described by linear strain model.According to the complexity of the fault belt deformation,we also give slip velocity of each fault in east boundary of Sichuan-Yunnan block using above three models to solve average sliding rate and near-field rate of faults in the research area.On the basis of judging possible deformation width of each fault,we obtain the abnormal region are Anninghe fault,which are relatively closed and the high rate of shear strain accumulation in the Xianshuihe-Anninghe-Zemuhe-Xiaojiang faults.