Wenchuan Earthquake And Secondary Geological Hazard Assessment Based On RS/GIS Technology

At 2:28 p.m. on May 12, 2008 Aba Tibetan and Qiang Autonomous Prefecture in Sichuan Province Wenchuan County near the town of Ms = 8.0 magnitude earthquake, which follows the 1976 "Great Tangshan Earthquake" and 1988 "Yunnan Lancang, Gengma earthquake "After the first time in 20 years, more than 7 magnitude earthquake that, to the local people's lives and property caused great damage.Earthquake region with a complex structure in which, at the eastern edge of Sichuan and Yunnan, South China Bayan Har and three active blocks in the intersection area, complex geological structure, after the earthquake, all communication traffic power interruption, the secondary geological disasters are very serious.In this context, two aspects of the earthquake started the research: from the macro level, the main development of seismic areas, the scope and impact of disasters caused by the relationship between regional structures and activities and its regional tectonic earthquake process performance. Through such studies, can be earthquake geological conditions, and different regional geological setting performance in the earthquake and its characteristics, help after earthquake disaster areas to quickly identify serious earthquake victims, the rescue operation launched to provide technical support; from the micro level, the hardest hit by the earthquake is located in mountain valleys, topography is extremely poor, a strong earthquake caused surface uplift and subsidence, cracking the wrong road, bridge collapse, there are landslides, landslide, landslides, debris flow, weir Cyprus Lake and other severe secondary geological disasters. Therefore, in this typical disaster situation, carried out after the earthquake, the geological evaluation of secondary disasters.Summarized and concluded in the previous study on the earthquake and the work of secondary geological disasters, based on the development model based on earthquake hazard information on the analysis and conclusion, and the weight of evidence approach using classification, delineation of the disaster hit area and give treatment recommendations. Through the extraction and analysis of large amounts of information, summarized in the study area earthquake model, secondary geological hazards model and evaluation model of secondary geological disasters; use of the geological structure information and information on regional tectonic earthquake research; summarized characteristics of the earthquake's victims; based on the data obtained in a large number of secondary geological disasters, development characteristics and influencing factors; application of weight of evidence has delineated a high incidence of secondary geological disasters and in accordance with the probability of secondary geological hazards from large to Wenchuan County teenager is divided into three regions, all sectors of the region to determine the location and size, and give treatment recommendations on the future planning and development of Wenchuan County, a decision made to help.