The rim of the Yellowstone Caldera
Satellite images acquired by ESA’s ERS-2 revealed the recently discovered changes in Yellowstone’s caldera are the result of molten rock movement 15 kilometres below the Earth’s surface, according to a recent study published in Nature.
Using Synthetic Aperture Radar Interferometry, InSAR for short, Charles Wicks, Wayne Thatcher and other U.S. Geological Survey (USGS) scientists mapped the changes in the northern rim of the caldera, or crater, and discovered it had risen about 13 centimetres from 1997 to 2003.
InSAR, a sophisticated version of ’spot the difference’, involves mathematically combining different radar images, acquired from as near as possible to the same point in space at different times, to create digital elevation models and reveal otherwise undetectable changes occurring between image acquisitions.
Mariangela D’Acunto | alfa
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