Pair of satellite images of Unimak Island on June 21, 2014. On the left a NOAA AVHRR image showing strongly elevated surface temperatures at the summit of Shishaldin Volcano, consistent with ongoing low-level eruptive activity in the summit crater. On the right, from about 6 hours later, is a visible image of the island from a different satellite. Shishaldin is visible but there is no obvious sign of activity. A number of other volcanoes are visible as well. These are the kinds of images AVO scientists examine daily to evaluate the state of Alaska's 52 historically active volcanoes. For more information, explore our web site: www.avo.alaska.edu.
Image courtesy of AVO/USGS.
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