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Atka volcanic complex reported activity





Event Name : Korovin 2005/2

This is a questionable event.

Start:February 23, 2005 Observed
Stop:May 7, 2005 ± 14 DaysObserved

Steam: BibCard BibCard BibCard
Tephra plume: BibCard BibCard BibCard
Minor explosive eruption: BibCard
Eruption Type:Explosive
MaxVEI: 1 BibCard
ColHeight: 300 m BibCard

Description: From McGimsey and others (2007): "On the morning of February 24, 2005, AVO received a report from residents of Atka Village that Korovin had erupted the previous evening, producing a large steam and ash cloud. February 23 was a clear day and local residents had noticed minor steaming from Korovin about noon (see fig. 40 in original text). Then, about 7 p.m. HST (8 p.m. AST), they witnessed a dark plume over Korovin, rising several thousand feet high, drifting east, that had ash visibly falling out near the base, presumably confined to the flanks of Korovin (see fig. 41 in original text). Several minutes later, three or four smaller, gray puffs occurred. Although they watched, no further activity ensued during the calm, clear, moonlit night.

"Satellite data from about the time of the reported activity indicated the presence of a 1-2 pixel thermal anomaly and a small steam plume, possibly with localized minor ash. Height of the steam plume was estimated to be about 10,000 ft (~3 km), corroborating the observer account. AVO issued an Information Release on February 24 and raised the Level of Concern Color Code to Yellow. With no further reports of continuing activity, nothing evident in subsequent satellite data, and no unusual seismicity from a seismic station in Atka Village, AVO reduced the Color Code from Yellow to UA in the March 4, 2005, Weekly Update (see table 6 in original text). Evidence of similar activity has been identified in 2002 and 2004 satellite images and observed by field crews in 2004 (see fig. 42 in original text).

"A PIREP of steam reaching several thousand feet above Korovin on March 19 was the next report of activity, and then in early May observational data indicated that the lake had drained in the south summit crater of Korovin and that incandescence was visible in the about 100-m (~325 ft) - wide pit. The next several months were quiet.

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Page modified: March 30, 2017 14:36
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