Pre and post 2015 Nepal earthquake landslide inventories

摘要

A magnitude 7.8 earthquake struck Nepal on April 25, 2015. An earthquake-induced landslide inventory is under development by using multi-temporal images and mapping as polygons. The most abundant landslide types are: debris flows, shallow translational slides, and rockfalls. We compared the size frequency distribution of the inventory with those of other eight earthquake-induced landslide inventories, to study the relationship between the earthquake magnitude and the landslide size. We found that the proportion between small and large landslides is similar to the other earthquakes. Then, we studied how the landslide frequency density changes as a function of topographic parameters and the lithologies of the affected area. We observed that the mean slope gradient for earthquake-induced landslides is higher than expected and change with the slope aspect.