ALASKA VOLCANO PICTURES: Redoubt Erupts

ALASKA VOLCANO PICTURES:  Redoubt Erupts
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Sparked by avalanches of hot debris rushing down the Redoubt Volcano's northern flank, a mushroom cloud rises from the Alaska peak on April 21, 1990. A smaller, white plume of steam pours from the volcano's summit crater.

Redoubt, which started erupting again on March 22, 2009, is one of the most active of the Cook Inlet volcanoes that line Alaska's southern coast (Redoubt Volcano-Cook Inlet map). It's also the ninth most dangerous volcano in the country, according to the U.S. Geological Survey.

At the time, the 1990 event was one of the costliest volcanic eruptions in U.S. history.

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—Photograph by R. Clucas, courtesy Alaska Volcano Observatory
 
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