Assessment of geohazard in severely damaged region by Wenchuan Ms 8 earthquake, Sichuan Province, China

Based on investigation of geo-hazard and remote image interpretation of 14 counties within severely damaged region by Wenchuan Ms 8 earthquake, speedy quantitative assessment of hazards fatalness was carried out using GIS technology by means of expert experience method. Qualitative assessment is therefore conducted on this basis. This strong earthquake has induced many geo-hazard, mainly landslide and collapse, secondly debris-flow, geo-fracture and surface collapse, and locally sandy soil liquidation. These hazards mostly distribute around Longmenshan fault zone and its vicinities. This article has summed up the distribution characters, analyzed the forming conditions of geo-hazard in research region. It has also set up the assessment system, and has accomplished the fatalness zoning. The research region is thus divided into high dangerous region, medium dangerous region, and low dangerous region, then some regions are sub-divided into few sub-regions. Moreover, this paper has provided some disaster prevention and mitigation measures for highly dangerous geo-hazard region.