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GEOHAZARDS DEVELOPMENT CHARACTERISTICS AND INFLUENCE FACTORS ANALYSIS INDUCED BY NEPAL EARTHQUAKE

LUO Yong-hong;LI Shi-qiao;WANG Zhi-long;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Chengdu University of Technology);No.12th Gold Geological Party of Chinese People's Armed Police Force;  
April 25,2015 Ms 8.1 earthquake occurred in Nepal,The epicenter was about 120 km from Tibet Nyalam,but this earthquake triggered large number of geological hazards,which led to traffic blocking,casualties and losses of property.After the earthquake emergency investigation showed that the main geological hazards in Zhangmu area were the collapse,landslide and roadbed subsidence,and the earthquake led the party shattering deformation of Zhangmu Welfare landslide and the shatter slip of Bang village landslide.Statistics show that the vertical distribution of geological hazards from the riverbed elevation range of 100~300 m,Spatially from Zhangmu town to Kang Shan bridge to Nielamu,the density of seismic geological hazards decreased gradually.Comprehensive factor analysis showed that the"hanging wall effect"of seismogenic fault was the macro background of the serious damage in Zhangmu area,and the other fault made seismic ground motion attenuation so quickly.In addition,the topographic,elevation and rock structure were the main factors leading to rock slope dynamic failure.And the accumulation layer deformation and failure was controlled by degree of material density and the characteristics of groundwater enrichment.
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