An aerial view shows Redoubt Volcano, located 100 miles (160 km) southeast of Anchorage, Alaska, January 31, 2009. The United States Geological Survey (USGS) reports that vapor plume is intermittently visible as unrest at Redoubt Volcano continues. Seismic activity remains elevated and is well above background levels. REUTERS/Nathaniel Wilder (UNITE STATES)
Reuters/NATHANIEL WILDER