ANALYSIS OF THE CONTROLLING FACTORS |ON |GEO-HAZARDS IN MOUNTAINOUS EPICENTER ZONES OF |THE WENCHUAN EARTHQUAKE

Our reconnaissance to the mountainous epicenter zones of the Wenchuan Earthquake shows that the geohazard distribution in the Longmen Shan is heterogeneous on both horizontal and vertical directions. The geohazards are concentrated along the seismic fractures and non-seismic fractures in horizontal and at the top, river shoulders and isolated topography in vertical. The movement process can be divided into three stages of zero-length accelerated launching, gliding and -landing. The development of the geo-hazards is controlled by the seismic fracture, high intensity, duration of the earthquake, topography effects, the composed lithology and textures of the mountainous slopes.