Mount redoubt volcano activity compelled the seismologists and geologists to raise the alert level, about the eruption of redoubt volcano. Alaska's Mount Redoubt volcano erupted four times overnight, sending an ash plume more than 9 miles high into the air, but the state's largest city has likely been spared from any ashfall.
Geophysicist John Power said no cities have yet reported any ash fall from the volcano, but noted that it's still early.
Using radar and satellite technology, the National Weather Service is predicting ash to start falling later Monday morning.
Dave Stricklan, a hydrometeorogical technician with the National Weather Service, expected very fine ash
"Just kind of a light dusting," he said. 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, but nothing to really affect anything such as aviation travel. The heavier stuff will filter out," he said.
The 10,200-foot Redoubt Volcano, roughly 100 miles southwest of Anchorage, last erupted during a four-month period from 1989-90.
But 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 over the past 48 hours 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.
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