LAUSR

A catastrophic landslide hit Mount Fugui, Diexi Township, Mao County, Sichuan Province at 05:38:58 on June 24, 2017. This landslide buried Xinmo village, caused 83 deaths and resulted in enormous loss to people’s lives and properties. The Xinmo landslide was an earthquake-induced shattered mountain formed in the epicenter zone of the 1933 Ms7.5 Diexi earthquake (with an intensity of level X) and the strong motion zone of the Ms8.0 Wenchuan earthquake (with an intensity of level IX).The landslide mass cut out and slid from a high position, loaded continuously and accumulated at the top of the slope body. Subsequently, the landslide mass was transformed into avalanche debris, which clogged Songpinggou and thus formed a landslide dam, indicating a typical chain disaster of avalanche debris triggered by a ridge-top landslide. The total volume, elevation difference and horizontal distance of the landslide were 1637.6×10 4 m 3 , 1200 m and 2800m, respectively. The authors of this study identified the disaster-formation mechanism of the Xinmo Landslide based on a field geological survey, remote sensing satellites and the other means. The authors analyzed the disaster characteristics of the landslide source zone, avalanche debris zone and accumulation zone, numerically simulated and comparatively studied the whole process of the Xinmo Landslide movement using DAN-W, i.e., dynamic landslide software, and multiple groups of rheological models. The research findings indicated that the friction model was able to favorably simulate the movement characteristics of various phases of the Xinmo Landslide; this landslide lasted approximately 120 s and had a maximum velocity of movement of 74 m/s. As a result, the friction model and its parameters can be used in similar studies on dynamic disaster effects of ridge-top rock landslides.