Geological Disaster

Because of the geological and geographic conditions in Wenchuan, the Wenchuan earthquake triggered several secondary geological disasters, such as landslides, landslips, and debris flows, which not only led to heavy casualties and financial losses, but also severely damaged the roads, rivers, engineering projects, farmlands, and forests. The earthquake and the accompanying destruction of vegetation, landforms, rocks, soil, and other natural elements are the major causes of the change in the color and texture shown in the remote sensing images. The earthquake ruptured an approximately 29,000 km’ area. The geological disaster covers an area of 2250 km’, which is 7.8% of the total area.