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《Journal of Catastrophology》 2014-04
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GIS-based Landslide Hazard Evaluation Using AHP Method in the 2013 Lushan Earthquake Region

Liu Lina;Xu Chong;Xu Xiwei;Chen Jian;Key Laboratory of Active Tectonics and Volcano,Institute of Geology,Chinese Earthquake Administration;Department of Civil Engineering School of Engineering and Technology,China University of Geosciences;  
Based on the detailed review on the basis of domestic and foreign research progress on landslide hazard evaluation,the paper selected a great extend square area of 100 km × 100 km that centered around the epicenter as the study area in Lushan earthquake region. With GIS technology as a platform and combined with the feature of Lushan earthquake determined earthquake landslide impact factors for classification; analyzing the relationship between the represented area after a generalized assignment of the six impact factors on elevation,slope,aspect,curvature,lithology,and PGA after the distribution of landslides; zonal area percentage and landslide density index was used to measure the influence degree of various influence factors from earthquake landslide. Secondly,Using the method of AHP set up six relation matrix by six impact factors comparing the two for comprehensive analyzing each parameter weight; the influence factor weight distribution curve analysis results showed that PGA is the most serious factor affecting earthquake landslide and PGA lithology slope elevation curvature aspect is a relationship of impact factor to measure the influence degree of landslide Lushan earthquake region;Taking the average of six sets data as the final factor weight to build the landslide hazard threshold grid graph in the study area,and then dividing landslide hazard threshold grid graph into extremely high hazard zone,high hazard zone,middle hazard zone,low hazard zone,extremely low hazard zone which correspond the classification and assignment of evaluation factor; simultaneously,landslide hazard zoning map of the study area was provided. Finally,the rationality of the evaluation results was verified according to the landslide hazard evaluation results test curve of the actual triggered by Lushan earthquake landslide; Verification results showed that the value of AUC is percent85. 41,the accuracy of quantitative measure of landslide evaluation result for percent 85. 41 implied that the evaluation results accuracy is higher.
【Fund】: 国家自然科学基金项目(41202235);; 中国地震局2013年“4.20”芦山地震科考(芦山地震发震构造调查和探测)
【CateGory Index】: P642.22
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