Alaska's Redoubt Volcano Blows Off Steam

Redoubt is a 10,196-foot-high (3,108 meters) glacier-covered stratovolcano, about 105 miles (170 kilometers) southwest of Anchorage, in Lake Clark National Park.

The volcano formed beginning about 890,000 years ago and a collapse of its summit some 10,500-13,000 years ago produced a major debris avalanche that spread across the region, according to the Smithsonian's Global Volcanism Program.

An eruption in 1989 hurt the region's economy and halted air travel across the globe.

The volcano's last known eruption was in 2009, and a series of small earthquakes rumbled for a few days in April 2010.