Alaska Volcano Observatory shows steam from Redoubt Volcano in Alaska

This image provided by the Alaska Volcano Observatory/U.S. Geological Survey shows the Redoubt Volcano, Friday, Jan. 30, 2009 near Anchorage, Alaska. Scientists with the Alaska Volcano Observatory on Friday flew close to Drift Glacier and saw vigorous steaming emitted from a football-size area on the north side of the mountain. By Saturday, they had confirmed the area was a fumarole, an opening in the earth that emits gases and steam, and that it had doubled overnight.

This aerial photo shows steam venting from Mount Redoubt on Sunday, Feb. 1, 2009, near Anchorage, Alaska. Alaska's Mount Redoubt continued to rumble and emit steam Sunday but showed no dramatic burst of energy from the previous day, geologists monitoring the volcano said

This Feb. 7, 2009 photo provided by the Alaska Volcano Observatory shows steam from Redoubt Volcano on the north flank in Alaska. Stephanie Prejean, a seismologist at the observatory, said on Monday Feb. 9, 2009 that Redoubt's ongoing earthquakes have shifted in recent days to a higher frequency, which could signify actual rock breaking. (AP Photo/ Alaska Volcano Observatory,

This Feb. 7, 2009 photo provided by the Alaska Volcano Observatory shows steam from Redoubt Volcano in Alaska on the north flank moving over the south-southwest upper ridge. Stephanie Prejean, a seismologist at the observatory, said on Monday Feb. 9, 2009 that Redoubt's ongoing earthquakes have shifted in recent days to a higher frequency, which could signify actual rock breaking