Abstract:Utilizing the mobile crossfault shortline leveling and shortbaseline measurement data for over 20 years at 32 sites in SichuanYunnan area, we made a preliminary analysis of the contemporary activities and the activity characteristics of the major active faults in this area before the Wenchuan earthquake. The result indicates that since the 1980s the major active faults in this area mostly have showed successional movement and the regional stress in SichuanYunnan area increased persistently for two years after 2006 before the Wenchuan earthquake,besides,the relatively strong compressional stress toward NWSE appeared in the midsouth segment of Xianshuihe fault belt and the midsouth segment of Longmenshan fault belt.
Fan Guosheng,and Jiao Qing. ANALYSIS OF FAULT ACTIVITY CHARACTERISTICS IN SICHUAN-YUNNAN AREA BEFORE WENCHUAN Ms8.0 EARTHQUAKE[J]. jgg, 2008, 28(6): 27-30.