The Distribution Characters and Development Trends of Secondary Geological Disasters Caused by Lushan Ms 7.0 Earthquake in Sichuan Province, China

摘要

On the April 20th, 2013, Lushan Ms 7.0 earthquake caused large-scale secondary geological disasters including landslides and avalanches, which led to many roads interrupted and barrier lakes formed in some rivers. Due to the main earthquake fault is characteristic of thrust movement, secondary geological disasters are distributed in the upper plate, for example in Shuangshi Town, Taiping Town and longmen Countryside in Lushan County and surrounding areas of Muping Town in Baoxing County. The abnormal loosening and fragmentation of the mountains caused by the 7.0 magnitude earthquake can provide a great many of materials for secondary geological disasters' occurrence. Once torrential rain or heavy rain occurs, large-scale landslides, debris flows and avalanches will be formed in the areas. Secondary geological disasters will frequently occur in the future many years. The zone along Shuangshi-Taiping? Longmen-Qishuping(Part B in Fig.2) and the area near Muping Town in Baoxing County will be high danger places.