Situation and Risk of Earthquake-Induced Geo-hazards in Middle Reaches of Bailongjiang River, China

The middle reaches of the Bailongjiang River in southern Gansu province is one of the frequent geo-hazards areas and also the most damaged areas induced by 5.12 Wenchuan earthquake in China. Based on the information of secondary geo-hazards investigated by Gansu Provincial Department of Land Resources, the situation, risk and distribution characteristics of the earthquake-induced geo-hazards in study area have been analyzed. The analytical results showed that the situation of the disaster was not only related to the earthquake itself and its geological environments but also to human activities. The situation of the disaster and the potential risk are much more serious on both sides of rivers, roads, and the adjacent area of towns and villages. The 5.12 earthquake-induced geo-hazards appeared in large scale, dense distribution, serious disaster situation and higher risk in the downstream areas of many flowing basins with relatively higher population density and much frequenter human activities. These study results could be significance with some scientific basis to the post-disaster reconstruction and the prevention of secondary geological disasters.