Rockglaciers are permanently frozen sediments supersaturated with ice deforming steadily and slowly on periglacial mountain slopes. The frequency of alpine rockglaciers affected by “surge” (landslide-like) processes has increased during the last two decades probably in connexion with a signficant acceleration of rockglaciers deformation rate consecutive to permafrost warming. Flow velocities up to several metres per year can be observed. The analysis of 1-day ERS-1/2 differential SAR interferograms available for the period 1995-1999 has proved to be an adequate tool for detecting such very rapidly moving rockglaciers.