Risk Assessment Of Geological Hazard After Ya’an Earthquake In Wolong Nature Reserve

An earthquake measuring7.0magnitude struck Lushan in Yaan area of SichuanProvince on April20.2013..Its depth was of13km.The earthquake seriously destroiedthe giant panda habitat-caused named Wolong Nature Reserve.Therefore,studies onthe regional geological hazard risk assessment is of great significance.Based on a lot of results of geological disaster risk assessment at home and broad.the writer deeply analyzed the composition of risk assessment of geological and thecompartmentalization.classification and quantification of risk assessment elements inPingwu country through the collection of data on the the geological disaster researchin Pingwu country.Risk assessment of geological mainly composed by hazardassessment and vu nerability assessment which have their own evaluation indexsystem and evaluation methods.This article selects the Wolong Panda Nature Reserve as the research area, usingmulti-source remote sensing data, combined with the basic geographic informationand project data, such as the geological, hydrological, begin the secondary disasterssuch as landslide, debris flow information extraction, the selection of appropriateevaluation factor and model for geological disaster risk assessment to the wolongnature reserve. In this paper, with the aid of the open fund project in Digital EarthCenter of Chinese Academy of Sciences key laboratory-"Remote Sensing as the mainmethod in the natural disasters and heritage site habitat evaluation of the WolongPanda Nature Reserve" and the technology of space information technology of thedigital earth platform in the Chengdu University of Technology. Integrated all kindsof feature information of multi-scale,multiple data sources in the studied area,observation and analysis of time series, finally comes in geological disaster riskgrading thematic map, provide technical support for scientific decision-making.Affect the risk of geological disasters in the study area of the regional geologicalenvironment factors are the main factors of geological disasters, including the terrainslope,altitude,elevation, geologic structure, stratum lithology, precipitation, etc. Thedistribution of geological disasters in the study area in time and space are presentedthe obvious regularity. Based on geological disaster formation conditions and the influence degree, selecting factor controlling effect to the development of geologicaldisasters, using analytic hierarchy process (ahp) to determine each factor weight andestablish risk assessment model, the application of GIS spatial analysis function, togeologic disaster danger evaluation of the study area, the evaluation results reflect thebasic distribution law of earthquake induced geological disasters in the study area inline with the regional evaluation of accuracy, but also proved in this paper thereliability of the evaluation system and the index factor. In the study area, puttingforward the prevention and mitigation measures after an earthquake disaster on thebasis of geologic disaster danger evaluation, working for the subsequent geologicaldisaster governance.