Earth Observation essential for geohazard mitigation   Every year geohazards – such as volcanoes, earthquakes, landslide and tsunamis – claim thousands of lives, devastate homes and destroy livelihoods. Volcanoes     Averaged ground displacements measured on the Etna volcano, using an advanced technique of satellite aperture radar interferometry, using data from ESA's ERS-1 and -2. Earthquakes     This interferogram shows ground motion associated with the 26 December 2003 earthquake at Bam in Iran. The interferogram was created by combining an Envisat Advanced Synthetic Aperture Radar (ASAR) Wide Swath Mode (WSM) image with an Image Mode (IM) image. Typically IM is the sole ASAR mode exploited for interferography; making use of WSM in this way has the potential to broaden Envisat's InSAR coverage in future. Processed by Politecnico of Milano. Landslides     Sample DUE SLAM (Service for Landslide Monitoring) Landslide Motion Survey Product for part of the Arno Basin, Italy. The image shows an aerial photo overlaid by permanent scatterers derived from processing of ERS SAR data and coloured landslide polygons depicting the status of activity of landslides. Such polygons are defined by incorporating Permanent Scatterer-derived information (the average velocity along the Line of Sight) within conventional geomorphologic analysis. Release date: 8 June 2010