Abstract：Using the fault-crossing deformation data of 1980-2019 based on the 3D movement model of fault and the improved gray relation degree method, we study the movement characteristics and seismic hazards of the main active faults of Sichuan-Yunnan region. The results show that: 1) Xianshuihe fault zone shows a sinistral extensional movement on the whole, and has obvious segmented and differentiated movement characteristics. Zemuhe fault zone has the stage characteristics of changing from normal to reverse fault. Southern and northwestern Yunnan mainly show extensional movement. 2) The 3D accumulated activity and the synthetic index of the improved gray relation degree of the faults change obviously before and after the earthquakes of M≥6.0, which may be related to the preparation-occurrence, co-seismic and post-seismic adjustment effects of strong earthquakes near the fault. 3)Through analysis of the fault-crossing synthetic index, we conclude that we should focus on the area of the southeast segment of Xianshuihe fault zone, Zemuhe fault zone and the south of Yunnan.
TIAN Xiao,ZHENG Hongyan,LI Layue et al. Analysis of Movement Characteristics and Seismic Hazard of Main Active Faults of Sichuan-Yunnan Region[J]. jgg, 2021, 41(6): 561-567.
