汶川、芦山和九寨沟地震滑坡各影响因子贡献对比分析  

Comparative Analysis of the Contribution of Various Influencing Factors in Wenchuan Lushan and Jiuzhaigou Earthquake Landslides

作　　者：史丙新[1,2] 管勇[1] 亢川川[1] SHI Bingxin;GUAN Yong;KANG Chuanchuan(Sichuan Earthquake Agency, Sichuan Chengdu 610054, Sichuan;State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Sichuan Chengdu 610059, China)

机构地区：[1]四川省地震局,四川成都610054 [2]成都理工大学地质灾害防治与地质环境保护国家专业实验室,四川成都610059

出　　处：《四川地震》2020年第3期1-7,共7页Earthquake Research in Sichuan

基　　金：四川省地震局科研专项(LY-1909)项目资助;四川省地震局地震风险评估创新团队(201802).

摘　　要：地震滑坡的影响因子众多,在不同地震中,起控制作用的因子也不一致。文章通过收集整理汶川、芦山和九寨沟地震滑坡的数据库资料,采用贡献率分析和层次分析方法,计算出汶川、芦山和九寨沟三次大震中发生滑坡的各斜坡倾角、高程(差)、倾向以及地震烈度、PGA、震中距6项因子的贡献指数和它们的综合贡献率。结果显示:在斜坡高程影响因子中,高差在1000~2500 m范围内的属于地震滑坡数量最多的;在斜坡倾角影响因子中,坡角在20°左右的是地震滑坡数量最多的;斜坡倾向对地震滑坡的影响较小;PGA、地震烈度与地震滑坡数量占比和面积占比具有明显的正相关;震中距与地震滑坡的数量占比和面积占比具有明显的衰减特性。Earthquake landslide is affected by many factors and the controlling factors are not consistent in different earthquakes.By collecting and sorting out the database data of the Wenchuan,Lushan and Jiuzhaigou earthquake landslides,using the contribution rate analysis and analytic hierarchy process,the article calculates the slope angles,elevations(differences),inclination and seismic intensity,the contribution index of PGA and the six factors of epicenter distance and their comprehensive contribution rate.The results show that among the slope elevation influence factors,the ones with the height difference within the range of 1000~2500 m belong to the largest number of seismic landslides;among the slope inclination factors,those with a slope angle of about 20°have the largest number of seismic landslides;Slope inclination has little effect on seismic landslides;PGA and seismic intensity have a significant positive correlation with the proportion of earthquake landslides and the proportion of area;the epicenter distance and the proportion of earthquake landslides have obvious attenuation characteristics.

关 键 词：地震滑坡 倾角 高程 PGA 烈度 贡献 

分 类 号：P315.62[天文地球—地震学]