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  • Title: TerraSAR-X Colour Composite of Redoubt Volcano in Alaska
  • Location: Mount Redoubt Volcano, Alaska
  • Image Type: Radar
  • Resolution: 3m
  • Date: 04/15/2009
  • Secondary Date: 05/07/2009
  • Copyright: DLR e.V. 2009 and © Airbus Defence and Space GmbH 2009
  • Scale: 01:15,0
  • Imaging Mode: High Resolution SpotLight
  • Polarization Mode: W
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TerraSAR-X Colour Composite of Redoubt Volcano in Alaska

Colour Composite of three TerraSAR-X High Resolution SpotLight acquisitions (1m resolution) recorded on April 15th (red), 26th (green) and May 7th (blue) 2009. The image impressively illustrates the considerable transformation of the volcano crater and changes occurring on the surrounding slopes due to the removal of snow and ice and the sedimentation of ashes.
In January 2009 increased volcanic activities were recorded around Redoubt Volcano in Alaska that culminated in multiple significant eruptions and explosions between March 22nd and April 4th. The explosions sent ash and gas clouds to as high as 65,000 feet (19.8 km) above sea level. The activities denuded the volcano of snow and ice and considerable ash fall went down in the wider Mount Redoubt area and was even recorded in areas up to 340 miles distant. The activities continue intermittently albeit on a much lower level.
Ash and gas clouds that typically accompany volcanic activities hamper the acquisition of optical imagery, the cloud penetrating characteristics of the high-resolution radar satellite TerraSAR-X enable a consistent monitoring of the changes in the Redoubt Volcano area even during volcanic activity.