ABSTRACT
High speed landslide-debris-flow, which is compromised of collapse, landslide and debris flow, and moves at high speed with a huge dimension and potential energy, is a special mass erosion disaster carried terrible destroying power. On April 9, 2000, a huge landslide occurred in Yigong of Tibet, China, drawn world wide attention because it has revealed a large extent of geological process of gravitational erosion in a very short time and brought heavy economic loss and ecology disaster. Based on the basic images, the Men-PC interactioncan be used to analyze the landslide and obtain the basic information on landslide qualitatively. The Yigong Landslide is considered as a high speed landslide debris flow and has different motion styles in different section of the Zhamunong Gorge in different period. The Yigong landslide brought heavy economic loss and ecology disaster in large range and in a very short time.
