DANGER ASSESSMENT OF EARTHQUAKE-INDUCED GEOLOGICAL DISASTERS IN CHINA

Earthquake-induced secondary geological disasters include avalanches,landslides,caving-in,ground cracks and liquefaction of sand.The earthquakes of magnitudes > 5 and intensity > VI may lead to occurrence of various scales of geological disasters.The higher the magnitude and intensity are,the secondary geology disaster will be more serious.Based on the extent and occurrence conditions of secondary geological disasters induced by historic earthquakes in China,the danger assessment has been made with the city,prefecture and meng(league) as the unit.The high and moderate danger areas are mainly distributed in the Shaanxi-Gansu-Ningxia-Sichuan-Chongqing-Yunnan-Tibet region in the central part of China,forming a nearly NE-trending high danger zone,and all other remaining areas are low danger areas.