March 24, 2009 in Region

Mount Redoubt volcano erupts for sixth time

Associated Press
 
Alaska Volcano Observatory/U.S. Geological Survey photo

In this photo released by the Alaska Volcano Observatory/U.S. Geological Survey, steam rises from the top vent in the summit crater of Alaska’s Mount Redoubt on March 21, 2009. The Mount Redoubt volcano erupted six times Sunday night and Monday, March 22 and 23, 2009, sending an ash plume more than 9 miles into the air in the volcano’s first emissions in nearly 20 years.
(Full-size photo)

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 Tuesday 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.

Dave Stricklan, a hydrometeorogical technician with the National Weather Service, said the ash falling at a distance was likely “just kind of a light dusting.” He said the significant amount of ash probably dropped immediately, right down the side of the volcano.

“The heavier stuff drops out very quickly, and then the other stuff filters out. There’s going to be a very fine amount of it that’s going to be suspended in the atmosphere for quite some time,” he said. “The finer ash is going to travel farther, and any ash can affect aviation safety.”

Jackson said she was taking a sip of coffee when she tasted something funny on her lips — ash. She was experiencing other effects, too.

“My eyes are itching really bad,” she said as she hurried to get out of the store and to her car.

Jackson, who unexpectedly got the day off, hurried home from the grocery store to secure a motorcycle, snowmachine and vehicles under protective blue tarps.

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, said observatory geophysicist John Power.

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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