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| | Griggs - Activity - Citations |
 | | "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. |
 | | No fewer than 15 eruptive episodes have originated from the Katmai cluster in postglacial time (within the last 10,000 years), each lasting days to tens of years and all of which could have produced ash clouds. |
 | | During that great eruption, nearby Mount Katmai collapsed, destroying its summit peaks and leaving behind a 2.5-kilometer-wide caldera, now filled with a 250-meter-deep lake. |
| www.avo.alaska.edu /volcanoes/citations.php?eruptionid=459 (734 words) |
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