【摘要】 山区强烈地震诱发的滑坡崩塌是一种致灾严重、发生范围较广的灾害,进行地震滑坡危险区划是降低损失的有效手段之一。以2013年4月20日MW7.0芦山地震为例,以芦山县、宝兴县及其周边受滑坡崩塌灾害影响较为严重的区域作为研究对象,选定地层岩性、坡度、地震烈度、距断层距离和距水系距离等5类与地震滑坡关系密切的影响因子,采用层次分析法确定每个影响因子的权重,继而采取综合指标法,将研究区划分为低危险、中度危险、较高危险和最高危险4个等级的危险区,用以表示该区域在遭受给定的地震烈度作用下发生地震滑坡的可能性的大小。实地勘察的滑坡点分布与预测的地震滑坡危险区的对比表明,两者吻合程度较高,约有77%的滑坡点落在较高危险和最高危险区。研究成果可为地震滑坡灾害应急、山区地震滑坡预测、滑坡灾害预防等工作提供参考依据。更多还原

【Abstract】 Strong earthquake-induced landslides in mountainous region often cause serious damages to buildings,transportation route,lifeline engineering etc. It is one of the major reasons causing significant casualties and economic losses of property. For such serious and wide range disasters,doing classification for earthquake-induced landslide hazard zones is one of the effective methods for reducing losses. This paper,based on former studies,takes Lushan earthquake on April 20,2013 as a sample and selects Lushan County, Baoxing County and the surrounding area, which were influenced seriously by landslide,as a study area. This paper takes comprehensive indexes method to classify earthquake-induced landslide hazard zones for this area. There are 5 impact factors,including lithology,slope,seismic intensity,distances from faults and distances from drainages,are selected and weight is determined for each factor by AHP( the Analytic Hierarchy Process). The study area then is classified into 4 levels of hazards zones by comprehensive indexes method to indicate possibilities of triggering landslide in region under the suffering from given seismic intensities. The paper makes a comparison between the existing landslide sites map and the earthquake-induced landslide hazard zoning map. The results show a relatively high match between the two maps( about77% landslide sites are in the higher hazard zones and highest hazard zones). This research will provide a reference for emergency response of earthquake-induced landslide disaster,prediction of earthquake-induced landslides in mountainous area and prevention of landslide disaster.更多还原