【摘要】 以汶川地震重灾区四川省北川县为例,对研究区进行崩塌滑坡敏感性评价,并探究地震诱发的崩塌滑坡的分布规律。研究建立研究区崩塌滑坡空间数据库,选取距断裂带距离、坡度、坡型、高差、地层岩性等5个因素作为评价指标,采用层次分析法(Analytic Hierarchy Process,AHP)对指标的权重定量,使用因子加权相加模型对北川县的由地震引发的崩塌滑坡敏感性进行评价。研究发现,距断裂带距离和坡度对崩塌滑坡影响较强。研究结果将北川县划分为崩塌滑坡极度敏感区、高度敏感区、中度敏感区、轻度敏感区和不敏感区五个区域。其中,极度敏感区主要分布在北川县东部的龙门山断裂带上,并沿断裂带延伸,在西部河流两岸也有少量分布,高度敏感和中度敏感区在极敏感区外围辐射分布,轻度敏感区和不敏感区主要分布在研究区的西部地区。更多还原

【Abstract】 In order to evaluate the sensitivity of earthquake-induced landslide and collapse,and find the rule of these hazards’ location,the Beichuan County,Sichuan Province,was taken as the study area.The CBERS images and ALOS image as well as appropriate information extraction methods were used to build the landslides and collapses database of Beichuan County.Fault,formation lithology,slope,relative height and slope type were choosen as evaluation factors,and the analytic hierarchy process(AHP) method was used to calculate the weight of each factor.It was found that the distance to the fault and the slope had greater influence on the hazards,and so did the slope type.The study area was classified into 5 classes by the sensitivity of landslide and collapse: extremely sensitive,highly sensitive,moderately sensitive,slightly sensitive and insensitive.The area along the Longmenshan fault was extremely sensitive to landslide and collapse,and there were small regions of extremely sensitive in the west of Beichuan.The area of highly sensitive and moderately sensitive distributed in the boundary of extremely sensitive zone,and most area in the west of Beichuan was slightly sensitive or insensitive to the hazard.更多还原