Thirty years of evolution of the Sedrun ...

The 3D displacement fields of the Sedrun landslide located in Switzerland in the Grison canton have been computed for two periods (1973 to 1990 and 1990 to 2003) by combining Digital Terrain Models (DTM) differences and correlation of aerial ortho-images. The displacement fields, which are similar for the two periods, have been compared to the tectonic structures which exist at the surface of the landslide. Zones of major velocity gradient visible on displacement maps correspond to areas marked by strong br