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Courtesy of AVO/Cindy Werner

The alert level for Bogoslof Volcano has been downgraded to “normal” after more than three months of inactivity.

The Alaska Volcano Observatory made the announcement Wednesday, although scientists say remote monitoring makes it difficult to determine if the eruption is really over.

While Bogoslof exploded more than 40 times in the last year, the AVO says all signs now point to another period of quiet.

Courtesy of Alain Beauparlant

After more than 40 years of quiet, the Great Sitkin Volcano has grown restless.

The Alaska Volcano Observatory (AVO) raised its alert level last week after Adak residents reported a steam plume rising 1,000 feet above the summit.

AVO Geophysicist Dave Schneider said the plume is just the latest sign of life at Great Sitkin, which has shown increasing seismic activity since the summer of 2016. That’s why the AVO upgraded its alert level from “normal” to “advisory.”

Paul Wade, NOAA Fisheries

 

Before Bogoslof volcano started erupting, it was a haven for endangered Steller sea lions, fur seals, and sea birds. But scientists did not know when and if animals would return to the eastern Aleutian Island.

Max Kaufman/Alaska Volcano Observatory/University of Alaska Fairbanks, Geophysical Institute

 

Scientists have had a hard time monitoring Bogoslof volcano since it started erupting in December. The island is so small, there is no equipment on the volcano, making it difficult to predict eruptions.

No one lives on Bogoslof – the closest human neighbors are 60 miles away in Unalaska. Scientists monitor from afar and they’ve had a lot to monitor lately. The volcano has erupted more than 40 times since December.

Max Kaufman/AVO/UAF-GI

Bogoslof Volcano erupted Tuesday night for the first time in two months.

The eastern Aleutian volcano blew around 10:30 p.m., spewing ash 34,000 feet into the air.

The explosion lasted about 73 minutes, according to the Alaska Volcano Observatory.

While seismic activity has since stopped, scientists say Bogoslof could erupt again with little warning. They’ve also issued a marine advisory for potential ash fall in the region between Cape Sarichef and Nikolski.

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