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Earth Observation essential for geohazard mitigation
 
12 November 2007

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Every year geohazards – such as volcanoes, earthquakes, landslide and tsunamis – claim thousands of lives, devastate homes and destroy livelihoods.
 
  Volcanoes
 
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Ground displacements
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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.

Credits: TRE, ESA
 
  Earthquakes
 
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Envisat WSM/IM InSAR image of Bam
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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.

Credits: Polimi/Poliba
 
  Landslides
 
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Landslide Monitoring Survey Product for Arno Basin, Italy
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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.

Credits: ESA/TRE/Universitá di Firenze
 
 
 Observing the Earth
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Group on Earth Observations (GEO)The IGOS Geohazards Initiative
 
 
 
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