大地震诱发滑坡的分布特点及危险性区划研究
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摘要
汶川8.0级大地震诱发大规模以滑坡、崩塌为主的地质灾害,改变了原有的地貌形态,形成多处堰塞湖,毁坏民房和道路,使之成为严重的次生滑坡灾害危险区域。以成都市的都江堰、彭州、崇州、邛崃、大邑5个市、县地震区为研究区,分析了滑坡分布与地震烈度和宏观震中距关系,并在GIS技术的支持下采用贡献权重迭加法进行了滑坡危险性区划,分别获得研究区不同等级的危险区面积和滑坡分布密度,其中彭州、都江堰成为地震滑坡最严重的区域。
The large-scale geological hazards as landslides and collapses induced by the Wencuan earthquake of magnitude 8.0 on 12 May 2008 changed original geomorphologic features,formed many dammed-lakes and destroyed houses and roads which became a serious landslide risk in this region.Taking earthquake regions in Chengdu,including Jiangyan,Pengzhou,Chongzhou,Qionglai and Dayi as research areas,the relation between landslide distribution and seismic intensity and macroscopic epicentral distance is analyzed.Based on GIS technology and landslide hazard zoning,the hazard area and landslide distribution density in the areas with different risk levels are obtained by use of the method of contribution weight superposition.The results show that Pengzhou and Du Jiangyan are most seriously affected by earthquake landslides.
The large-scale geological hazards as landslides and collapses induced by the Wencuan earthquake of magnitude 8.0 on 12 May 2008 changed original geomorphologic features,formed many dammed-lakes and destroyed houses and roads which became a serious landslide risk in this region.Taking earthquake regions in Chengdu,including Jiangyan,Pengzhou,Chongzhou,Qionglai and Dayi as research areas,the relation between landslide distribution and seismic intensity and macroscopic epicentral distance is analyzed.Based on GIS technology and landslide hazard zoning,the hazard area and landslide distribution density in the areas with different risk levels are obtained by use of the method of contribution weight superposition.The results show that Pengzhou and Du Jiangyan are most seriously affected by earthquake landslides.
引文
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[3]李涌,姚永波.阿坝州及邻区地震烈度衰减关系[J].四川地震,2000,(4):58-61.
[4]乔建平,刘恒一.攀西地区地震诱发滑坡的类型及发育规律[J].四川地理,1985,(7):92-102.
[5]乔建平,蒲晓虹.川西南滇北接壤带地震滑坡概述[J].山地研究,1987,6(3):181-186.
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