AVO

Courtesy of the Alaska Volcano Observatory

Scientists have downgraded the alert level for an Aleutian volcano that began showing an increase in signs of eruption and emitting harmful ash late last week. 

According to Dave Schneider, a geophysicist with the Alaska Volcano Observatory, over the last several weeks, satellites and pressure sensor data revealed ramped up activity at Semisopochnoi Volcano, which is located on an uninhabited island in the Rat Islands about 600 miles southwest of Unalaska. 

Courtesy of William Dushkin

Scientists have upgraded the alert level at one of Alaska's most active volcanoes after increased volcanic unrest.

Starting last week, satellites detected an increase of gas emissions and elevated surface temperatures at Cleveland Volcano, which is located on an uninhabited island in the central Aleutians, west of Umnak Island.

The data indicates a potential for increased eruptions, according to Dave Schneider, a geophysicist with the Alaska Volcano Observatory, so the AVO has raised the aviation color code to "yellow" and the alert level to "advisory." 

John Lyons / USGS

In a new study, scientists say a group of volcanic Aleutian islands could be part of a massive, single, undiscovered volcano.

While scientists have been compiling their research for six years, there's still a lot to piece together, according to Diana Roman, a volcanologist with the Carnegie Institution for Science in Washington, DC.

Alaska Earthquake Center

A magnitude-6.4 earthquake hit about 25 miles east of Nikolski Tuesday morning, and was felt by residents in Nikolski, Unalaska, and Akutan. The earthquake hit just before 7:30 a.m.

It was a "reasonable size tectonic earthquake," according to Dave Schneider, a geophysicist with the Alaska Volcano Observatory. He said Aleutian Island residents can expect to feel some aftershocks.

"This is a pretty typical tectonic earthquake for the region," he said. "It's on a very seismically active part of the Aleutian arc, and there's nothing that jumps out as being unusual."

Hope McKenney/KUCB

 

On Monday, in the middle of testing the city’s sirens, Unalaska received notification of a large earthquake southeast of Sand Point and a subsequent tsunami warning in communities east of Unalaska to the Kenai Peninsula

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