WILLOW, Alaska — Alaska’s Mount Redoubt volcano erupted Monday night for a sixth time in less than 24 hours, sending an ash plume more than 9 miles into the air in the volcano’s first emissions in nearly 20 years.
The Alaska Volcano Observatory reported that the sixth eruption came at 7:41 p.m. Monday. Web cameras showed steaming from the summit after the ash emission ended, the observatory said.
The five earlier eruptions came late Sunday night into Monday morning.
Residents in Anchorage, the state’s largest city, were spared from falling ash, though fine gray dust fell early Monday on small communities north of Anchorage. The National Weather Service forecast more light ashfall in the same area through this morning.
“It’s coming down,” Rita Jackson, 56, said Monday morning at a 24-hour grocery store in Willow, about 50 miles north of Anchorage. She slid her fingers across the hood of her car, through a dusting of ash.
Ash from Alaska’s volcanos is like a rock fragment with jagged edges and has been used as an industrial abrasive. It can injure skin, eyes and breathing passages. The young, the elderly and people with respiratory problems are especially susceptible to ash-related health problems. Ash can also cause damage engines in planes, cars and other vehicles.
Alaska Airlines on Monday canceled 19 flights because of the ash. In-state carrier Era Aviation canceled four, and Elmendorf Air Force Base in Anchorage kept 60 planes, including fighter jets, cargo aircraft and a 747 commercial plane, in shelters.
Five of 20 Alaska state senators were scheduled on the morning flight from Anchorage to Juneau, which was canceled. As a result, consideration of legislation, including a resolution accepting federal stimulus funds, was delayed.
The first eruption, in a sparsely populated area across Cook Inlet from the Kenai Peninsula, occurred at 10:38 p.m. Sunday and the fifth happened at 4:30 a.m. Monday, according to the Alaska Volcano Observatory.
The wind took the ash cloud away from Anchorage, toward Willow and Talkeetna, near Mount McKinley, North America’s largest mountain.
There were reports of a quarter-inch of ash in Trapper Creek and up to a half-inch at a lakeside lodge near Skwentna.
The 10,200-foot Redoubt Volcano, roughly 100 miles southwest of Anchorage, last erupted during a four-month period from 1989-90.
In its last eruption, Redoubt sent ash 150 miles away into the path of a KLM jet and its four engines flamed out. The jet dropped more than 2 miles before the crew was able to restart all engines and land safely. The plane required $80 million in repairs.
The volcano became restless earlier this year. The observatory had warned in late January that an eruption could occur at any time.
Increased earthquake activity prompted scientists to raise the alert level for Mount Redoubt on Sunday.
On Sunday morning, 40 to 50 earthquakes were being recorded every hour.
A steam plume rising about 1,000 feet above the mountain peak was observed Saturday.
Three seismometers on the mountain were damaged in the eruption but seven others remained in place, observatory geophysicist John Power said.
Power said the history of past eruptions of Redoubt indicate the volcano could erupt again in the next few days or weeks.
“It’s something we need to stay prepared for,” he said.
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