Risk Assessment And Forecast Of Geological Disaster In Southeast Tibet

Southeast of Tibet Autonomous Region is located in the southeastern part of the study area,due to the impact of terrain and the Indian monsoon, so that the area formed a landscape of mountains and valleys. There are abundant water resources, in the long run, the region’s water resources development can not only develop the local economy, but also for China’s economic construction and ease the power shortage play a role. However, the special landscape area geological environment, resulting in the area of geological disasters to be widely, types, a major safety. Among them, earthquakes, landslides, avalanche and landslide hazards most seriously affected area station building security.Paper is a large number of geological disasters in the southeast of Tibet on the basis of complete data, the author of the study area through the collection of existing research results (published mainly to try to collect unpublished data), combined with remote sensing and GIS means, Comprehensive analysis of geological disasters in southeast Tibet occurrence and distribution. Primarily made the following conclusions and results:1 River of Brahmaputra, layer of Holocene is very development, earthquakesis very frequent, downstream in the Brahmaputra region have occurred in 8.6 strong earthquake, Damage caused for the ground, the possibility of a larger earthquake in the future is more likely. Geological hazard is mainly to landslide, debris flow and landslides. Taken together, construction of power stations hava a greater risk in the downstream of the Brahmaputra River.2 Nu River and Lancang River Basin faulting is weak, although there is some major faults in Quaternary activity, but in late Pleistocene and Holocene movement is not obvious. Himalayan seismic zone and xianshui river seismic zone are strong seismic zone. The two seismic zone earthquake ,to gather the energy of interaction between plates be released, on the Nu River and Lancang River Basin play a role in mitigation, so they are in a relatively stable state. Although the Nu River, Lancang River have some landslides, debris flow and landslide disasters, but in general small,and less impact on the station. Taken together, Nu River and Lancang River Basin low risk of building power plants.3 Jinsha River is development along Red River - Jinsha River fracture, the fracture is a strong activity in the Quaternary strike-slip fracture, especially in the southern section, late Pleistocene - Holocene activity is strong, therefore, the seismic is activity, Batang occurred many times in the vicinity of strong earthquakes, particularly near the Shiqu Dongke,4 Jinsha River fracture intersect with the Xianshui River seismic zone, form a strong regional seismic activity.But from Shiqu Dongke to Batang, fracture activity is weak, and landslide, debris flow and landslide disasters are small, for the construction of the hydropower station is beneficial.