| 汶川地震滑坡危险性评价——以武都区和文县为例 |
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| 引用本文： | 孙艳萍,张苏平,陈文凯,周中红.汶川地震滑坡危险性评价——以武都区和文县为例[J].西北地震学报,2018,40(5):1084-1091. |
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| 作者姓名： | 孙艳萍 张苏平 陈文凯 周中红 |
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| 作者单位： | 中国地震局兰州地震研究所, 甘肃 兰州 730000,中国地震局兰州地震研究所, 甘肃 兰州 730000,中国地震局兰州地震研究所, 甘肃 兰州 730000,中国地震局兰州地震研究所, 甘肃 兰州 730000 |
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| 基金项目： | 中国地震局兰州地震研究所地震科技发展基金项目（2017Q01）；中国地震局应急救援司地震应急青年重点任务（CEA_EDEM-201509）；甘肃省科技支撑计划（1504FKCA065） |
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| 摘 要： | 利用GIS技术详细研究汶川地震在甘肃省陇南市武都区和文县触发的滑坡地质灾害的分布规律及其与地震烈度、地形坡度、断层、高程、地层岩性的相关关系，采用基于GIS的加权信息量模型的崩塌滑坡危险性评价方法，对研究区的地震滑坡危险性进行学科分析。结果表明：极高危险区在高程上主要分布在集水高程区，高度危险区主要沿白水江、白龙江等主干河流两侧极高易发区的边界向两侧扩展，轻度和极轻度危险区面积占比较小，主要分布在低烈度、活动断裂不发育、人类活动微弱的高海拔地区，另外国道G215沿极高危险性区域分布明显；利用危险性等级分区结果统计人口公里格网数据，得到武都区和文县潜在影响人口，发现研究区约78万人将受到地震滑坡灾害的潜在影响。
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| 关 键 词： | 武都区和文县 地震滑坡 GIS 加权信息量 危险性 |
| 收稿时间： | 2017/4/1 0:00:00 |
Risk Assessment of Landslides Caused by Wenchuan Earthquakes: A Case Study in the Wudu District and WenxianCounty, Gansu Province |
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| SUN Yanping,ZHANG Suping,CHEN Wenkai and ZHOU Zhonghong.Risk Assessment of Landslides Caused by Wenchuan Earthquakes: A Case Study in the Wudu District and WenxianCounty, Gansu Province[J].Northwestern Seismological Journal,2018,40(5):1084-1091. |
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| Authors: | SUN Yanping ZHANG Suping CHEN Wenkai and ZHOU Zhonghong |
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| Institution: | Lanzhou Institute of seismology, CEA, Lanzhou 730000, gansu, China,Lanzhou Institute of seismology, CEA, Lanzhou 730000, gansu, China,Lanzhou Institute of seismology, CEA, Lanzhou 730000, gansu, China and Lanzhou Institute of seismology, CEA, Lanzhou 730000, gansu, China |
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| Abstract: | Wenchuan earthquakes have triggered a large number of geological disasters in Gansu Province, such as structural collapse and landslides. Based on studies of the distribution characteristics of earthquake-induced landslides during Wenchuan earthquake, we used a GIS-based weighted information model to evaluate the seismic landslides'' risk in Wudu District and Wenxian County, Gansu Province. Results showed that:lithology types have a certain control effect on the distribution of seismic landslides, and most of the seismic landslides in the study area distribute and develop in both the extremely and relatively slide-prone strata, with a slope of 20°~50° and elevation of 1 000~2 000 m. With increasing seismic intensity, the density of seismic landslide disasters increases; about 70% of the landslides develop in the range of 10 km from the fault-fractured zone. Statistical analysis of the relationship between the risk classification results in the study area and the number and density of landslides showed that the evaluation results are highly accurate. In the elevated area, extremely dangerous areas are mainly distributed across catchment zones with strong surface runoff and frequent human engineering activity. In addition, the route of national highway G215 being along the extreme danger zone is obvious, so attention should be paid to the possibility of collapse and landslides in these areas. The high-risk area spreads along the extremely high-prone area, located on both sides of major rivers such as the Baishui and Bailong. Light risk and extremely light risk areas are relatively small, mainly distributed across high altitude areas with low intensity, poorly developed active faults, and weak human activity. Statistical analysis showed a total of about 780 thousand people in the study area potentially affected by the landslide hazard. |
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| Keywords: | Wudu District and Wenxian County seismic landslide GIS weighted information value hazard |
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