A short-lived explosive eruption of Bogoslof volcano was reported by several pilots around 4 p.m. AST, Monday.
According to the Alaska Volcano Observatory (AVO), the pilots reported a volcanic ash cloud rising to an estimated altitude of 34,000 ft (10.3 km). Satellite data show a discrete, short-lived explosion just prior to 4 p.m. that detached and drifted to the south roughly fifteen minutes later.
“On the basis of this information, the Aviation Color Code is increased to Red and the Volcano Alert Level to Warning. There is no ground-based volcano monitoring equipment on Bogoslof volcano so AVO is unable to provide a forecast of future eruptive activity. We will monitor satellite images and data from distant seismic and infrasound instruments for indications of significant explosive activity,” stated the Alaska Volcano Observatory in a statement.
The RED volcano alert warning means, “Eruption is imminent with significant emission of volcanic ash into the atmosphere likely OR eruption is underway or suspected with significant emission of volcanic ash into the atmosphere [ash-plume height specified, if possible].”
Also known as Agasagook Island, Bogoslof Island is the summit of a largely submarine stratovolcano located in the Bering Sea, approximately 31 miles behind the main Aleutian volcanic arc.
The 173-acre island is unpopulated and has a peak elevation of 490 feet above sea level.(150 m).
The volcano last erupted in July 1992.
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