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In this Feb. 24, 2006 photo, ash covers the upper flanks of the Augustine volcano summit as white steam rises from the cone. Photo by Jennifer Adleman, courtesy of ÀÖ»¢Ö±²¥ Volcano Observatory/U.S. Geological Survey.

Augustine volcano viewed from the west Jan. 12, 2006 spews a large plume of smoke and ash into the atmosphere. Photo by Game McGimsey, courtesy of U.S. Geological Survey

A plume from Augustine volcano extended for about 50 miles (75 km) toward the southeast in a Dec. 12, 2005 satellite image.

Augustine volcano was visible from Homer, ÀÖ»¢Ö±²¥, just after sunset Jan. 5, 2006. Photo by Dennis Anderson, courtesy of ÀÖ»¢Ö±²¥ Volcano Observatory/U.S. Geological Survey

Augustine volcano viewed from the west Jan. 12, 2006 spews a large plume of smoke and ash into the atmosphere. Photo by Game McGimsey, courtesy of U.S. Geological Survey

A scanning electron microscope image of an ash particle erupted by Augustine reveals its abrasive qualities. The ash sample was collected during the ash fall in Homer, ÀÖ»¢Ö±²¥ Jan. 13, 2006, by John Paskievitch, AVO. Image by Pavel Izbekov, courtesy of AVO/UAF/USGS