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The Alaska Volcano Observatory has issued a yellow warning, which USGS indicates means: “Volcano is exhibiting signs of elevated unrest above known background activity.” High-resolution satellite images yesterday showed a small ash deposit coming from the North Cerebus Crater on the Semisopochnoi Island in Alaska
The steam has obscured views into the crater.
The Alaska Volcano Observatory said: “There is no evidence for continuing activity, but observation of a new deposit suggests renewed unrest.”
They added how they are “increasing the Aviation Color Code to yellow and the Volcano Alert Level to advisory”.
The Observatory continued: “Small eruptions producing minor ash deposits within the vicinity of the volcano are typical of activity during unrest at Semisopochnoi since September 2018, with the last detected activity in June 2020.
“Local seismic stations have been offline since November 11, 2020. New explosions could occur at anytime with no warning.”
The volcano is monitored remotely by satellite and lightning senors.
The Observatory added in their report: “An infrasound array on Adak Island could detect explosive emissions from Semisopochnoi with a 13 minute delay if atmospheric conditions permit.”
Semisopochnoi Island is part of the Rat Islands group in western Alaska and contains several volcanoes.
It is the largest young volcanic island in the western Aleutians and is composed of a number of volcanic landforms.
Mount Cerebus is the most active of three younger volcanos within the island.
More to follow…
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