Distribution Regularities of Landslides Induced by Wenchuan Earthquake, Lushan Earthquake and Nepal Earthquake

In order to study the distribution laws of landslides induced by earthquakes, the distribution regularities of landslides were investigated statistically based on the data of 22 302 landslides induced by the Wenchuan earthquake, 1 608 landslides induced by the Lushan earthquake, and 919 landslides induced by the Nepal earthquake using GIS techniques, and the relationships of the landslides with distance from coseismic fault, lithology, slope position and slope shape were discussed. The research results show that the landslides induced by the three earthquakes were more serious in hard rock zones than in soft rock zones and in complex slope shape zones than in simple slope shape zones. Moreover, the distributions of these landslides shown a hanging wall and footwall effect. The distributions of the landslides shown a fault effect in ordinary circumstances, otherwise, thefault effect did not exist in intensity anomaly. The landslides had a characteristic, i.e., they were more serious in high slope position only when seismic intensity was not less than intensity Ⅸ.