ANCHORAGE, Alaska (AP) - One of Alaska's largest and most active volcanoes is restless again, prompting scientists to issue an aviation advisory.
Alaska Volcano Observatory scientists increased the threat level of Mount Veniaminof (VEN'-ee-ah-mean-off) from yellow to orange Tuesday. That color designation indicates that sudden explosions could send ash above 20,000 feet (6,100 meters) and threaten international airplanes.
The observatory's coordinating scientist, David Fee, says the 8,225-foot (2,500-meter) volcano became active Saturday. Fee says small and sparse ash emissions seen rising to the 10,000-foot (3,050-meter) level prompted the threat level change