Getting Edgy Under Edgecumbe

Mount Edgecumbe, as seen from Thomsen Harbor, Sitka, Alaska; Photo credit:U.S. Forest Service/Jeffrey Wickett

Last April, a series of earthquakes around and under Mount Edgecumbe brought greater attention to what was considered a dormant volcano. Measurements show that magma is moving deep underneath Edgecumbe. Other signs have also brought new scrutiny: Hikers have discovered vents with bubbling gas near the volcano, and satellite images show a bulging of the ground around Edgecumbe.

None of this means that Edgecumbe will blow anytime soon, but the State of Alaska has reclassified Mount Edgecumbe as a “high risk volcano”. With 73,000 people living in the region, the reclassification was probably wise. Currently, the east side of Edgecumbe is bulging faster than any volcano in Alaska.

The Alaska Volcano Observatory has plans to install seismic sensors and other instruments on Mount Edgecumbe over the coming months. Core samples show that the volcano erupted between 4000 -4300 years ago, and Tlingit oral history tells of an eruption approximately 800 years ago.

Currently, Alaska has one volcano at Code Orange, and four others at Code Yellow.

Unrest under Mount Edgecumbe and a bulging eastern flank

About icefogger

Just a basic, down to Earth, laid back type of guy here, who loves the outdoors, the indoors, jazz on the turntable, a fire in the woodstove, the northern lights blazing across the sky, and the company of good friends. View all posts by icefogger

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