Mount Martin and Alagogshak Volcanoes, Katmai, Alaska

Summit of Mount Martin showing active fumaroles and small acidic lake.  Image courtesy SR Wood, US NPS, Katmai

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Sept. 2006 Eruption of Fourpeaked Volcano, Alaska

Fourpeaked eruption Sept. 17, 2006. Mount Douglas is the larger volcano to the right. Note dual sources for eruptive plume. Photo taken by Lanny Simpson, Alaska High Mountain Images via AVO