Via Earthquakes Without Frontiers, which I just learned about when posting the item below, its most recent blog post: Nepal earthquake: likely areas of landsliding. Excerpt:
The Mw 7.9 Nepal earthquake on 25 April 2015 appears to have occurred on a shallowly north-dipping thrust fault beneath the Himalayas of central Nepal. The steep topography and high relief in the area of the epicentre, and the high intensity of shaking that was felt, mean that thousands of landslides are likely to have been triggered by the earthquake.
Based on past experience of earthquakes in steep mountainous terrain, like the 2005 Kashmir and 2008 Wenchuan earthquakes, some of these landslides will be large enough to create temporary dams across rivers in the area. The lakes created by these dams are particularly hazardous because they can drain without warning, usually within a few days of filling up, due to collapse of the unstable dam material.
Mapping the landslides will require satellite imagery taken after the earthquake. In the meantime, it’s useful to see what areas are likely to have been most affected by landsliding. The images below show the outputs of two different models of landslide susceptibility – that is, the probably that a landslide will have occurred in any particular place.
Susceptibility in these models is determined by the intensity of the shaking (derived from the USGS ShakeMap estimates, http://earthquake.usgs.gov/earthquakes/eventpage/us20002926#impact_shakemap), the steepness of the topography, the position of a given location on a hillside (because shaking tends to be greater at the tops of ridges than in neighbouring valleys), and the aspect (the direction in which the hillside faces).
Click through for the full post, which includes maps, links, and some technical discussion.