The Katmai cluster is a 25-kilometer-long line of volcanoes along the Alaska Peninsula 450 kilometers southwest of Anchorage, including (from northeast to southwest) Snowy Mountain, Mount Griggs, Mount Katmai, Trident Volcano, Novarupta volcano, Mount Mageik, Mount Martin, and Alagogshak volcano. All but Alagogshak have erupted within the last 6,000 years, often explosively, to produce lava flows, domes, and widespread tephra deposits. No fewer than 15 eruptive episodes have originated from the Katmai cluster within the last 10,000 years, each …showed first 75 words of 747 total…

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