Large plumes at Sherman Crater today

Feb. 27, 2014 gas plumes. Photo by Chris Farrow, Big Lake, Washington

Atmospheric conditions were right this morning to see a sizable gas plume rising from Sherman Crater and rising over 1000 feet. There have not been many good plume shows this winter. The plume is about 99% steam; the remainder of the gas is mostly CO2 and H2S, which are ultimately derived from hot magmatic rocks at an unknown depth below the volcano. The photo was taken by Chris Farrow, who lives near Big Lake, east of Mount Vernon. Thanks, Chris.

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