ANALYSIS ON DISTRIBUTION LAW, TYPES AND CHARACTERISTICS AND DEVELOPMENT TENDENCY OF SECONDARY GEO-HAZARDS INDUCED BY LUSHAN EARTHQUAKE

Lushan earthquake not only caused heavy property loss and personal injuries, but also induced many geological hazards such as avalanches and landslides. This paper is based on the analysis of geological environment condition of the earthquake-stricken area. It deeply analyzes the distribution law, types and characteristics and development tendency of the geological hazards. The earthquake induced 1337geological hazards which mainly include moderate - small scale avalanches, landslides and unstable slopes. The hazards are mainly developed in sandstone and mudstone of the Cretaceous and Triassic system, carbonatite of the Permian system, conglomerate of the Tertiary system and weathered crust and debris of the Quaternary system. They are densely distributed on steep slopes of both sides of the Longmen southern fault (Zhonglin-Shuangshi fault) and Baoxing, Linguan and Lushan river and on the inside slopes of some roads. The earthquake not only induced many geo-hazards, but also caused many potential and hidden geo-hazards. So, the geo-hazards in the disaster area will appear with an increasing trend in the future. This study can provide a reference for disaster prevention and mitigation in the post-earthquake reconstruction.