【摘要】 汶川地震诱发了数以万计的滑坡.选择2个地震滑坡重灾区域(A/B),基于空间分析方法,对地震滑坡分布与地层岩性、坡度、高程、地震动峰值加速度以及发震断裂距离之间的关系进行统计分析.结果表明,研究区A内滑坡最易发岩组为石墨片岩、石英岩岩组,研究区B内滑坡最易发岩组为粉砂岩、砂岩、硅质岩岩组;2研究区内滑坡易发程度均随着坡度的增加而升高,A区的滑坡发生优势坡度为44°,B区为38°;滑坡发育与高程均存在一定的对应关系;滑坡分布与地震动峰值加速度没有明显的对应关系,但是与距离发震断裂具有良好的对应关系,且上盘滑坡发育程度明显高于下盘.更多还原

【Abstract】 Tens of thousands of landslides were triggered by Wenchuan earthquake.The purpose of this study was to find correlations of landslide occurrence with formation lithology,slope gradient,elevation,peak ground acceleration,and distance from seismogenic fault in two selected landslide incidental areas(A /B),using spatial analysis methods.The results show that rock groups of graphite schist and quartzite had the most concentrated landslide activities in area A,while siltstone,sandstone,and chert rock groups in area B.The landslide susceptibility levels have a positive correlation with slope steepness in both the areas.The advantage slope gradient is 44°in area A and 38° in area B.There were also relations between elevation and earthquakeinduced landslide distribution.Peak ground acceleration has no positive or consistent correlation with earthquake-induced landslide occurrence,but the distance from seismogenic fault shows approximate positive correlation with landsliding.There is a higher landslide distribution area ratio on the upper plate than on the lower plate.更多还原