Abstract：Using the GPS velocity field data during the periods of 1999—2007 and 2007—2009, we analyzed the deformation characteristics of the SichuanYunnan region during the two periods with block deformation model and by analyzing the GPS velocity profiles. The results show that the direction of the principal compressive strain rate of the westnorthern segment of Sichuan blockthe middle segment of Yunnan blockthe westsouthern segment of Yunnan block is characterized by clockwise rotation from north to south. The Anninghe fault and the Zemuhe fault have some shear strain accumulation, and the southern segment of Xiaojiang fault is mainly strikeslip, but its northern segment is mainly accumulating strain. The earthquake had relatively obvious influence on the mediumsouthern segment of LijiangXiaojinhe fault, the Anninghe fault and the Jinshajiang fault,meanwhile it affected the Zemuhe fault, the Xiaojiang fault and the Honghe fault less.
Zhao Jing,Jiang Zaisen,Wu Yanqiang et al. STUDY ON CHARACTERISTICS OF BLOCK STRAIN AND FAULTS DEFORMATION OF SICHUANYUNNAN REGION BEFORE AND AFTER WENCHAUN EARTHQUAKE[J]. jgg, 2011, 31(5): 30-34.
