【摘要】 针对四川省雷波县马湖古滑坡群规模的新发现,对其地貌与运动学特征进行详细分析,以期研究该滑坡群的成因。依据钻孔及超声波所测量的马湖湖底地形确定古璜琅河河床特征、古滑坡群平面范围和深度;在古滑坡外形、结构及地质环境现场调查的基础上,重点进行地貌分析、古滑坡群分期和确定各期运动轨迹;运用能量守恒方程计算滑坡速度,辅助确定古滑坡群的形成机制。结果表明:滑坡群规模巨大,面积达18.2 km2(包括湖底部分),体积约20×108m3;滑坡群按照岩性和结构可以分为3区,形成过程分为4期;古滑坡群为多期地震诱发的顺高陡地层界面的高大、高速、远程滑坡;地貌和运动学分析可作为确定古滑坡成因的一种方法。更多还原

【Abstract】 The landform and kinematics characteristics of Mahu ancient landslides in Leibo County,Sichuan Province were analyzed in detail to obtain it’s causes aimed at the new finding of it’s scale. Analysis on the riverbed of ancient Huanglang River,the plane range and depth of the ancient landslide was done on the basis of borehole and ultrasonic measurement of the terrain of the dammed lake bottom. Based on the site investigation of shape,structure and geological environment,the landform was analyzed,the periodizations of the landslides were described,and the movement of each landslide event was concluded. The energy conservation equation was used to calculate the velocity,which helps to confirm the causes of the ancient landslides. The results showed the landslide has a super large-scale,with surface area of 18. 2 km2 which includes the underwater part and volume of about 20 × 108m3. The ancient landslides can be divided into three zones according its composition and four events according its order. The landslide slided along the high and steep formation interface with huge scale,huge velocity and longer distance,it may be caused by earthquake; analysis of the landform and kinematics of ancient landslides is a good method to help confirming their causes.更多还原