Griggs - Activity - Citations

Mount Griggs: A compositionally distinctive Quaternary stratovolcano behind the main volcanic line in Katmai National Park
"Mount Griggs is one of the larger and better preserved stratovolcanoes in the region, rising about 1,750 m above the floor of the Valley of Ten Thousand Smokes. With its summit reaching about 7,650 ft (2,330 m) in elevation, Mount Griggs is the highest peak in Katmai National Park. Present-day symmetry of the apparently little-dissected edifice reflects numerous effusions of andesitic lava during the late Pleistocene and Holocene that have healed and concealed older scars of glacial erosion. Moderately productive during postglacial time and still fumarolically active, Mount Griggs is also the longest lived center in the Katmai cluster; its construction began nearly 300 ka. Although the volcano has not erupted historically, a large volume of Holocene lava covers its southwest slope."

Hildreth, Wes, Fierstein, Judy, Lanphere, M. A., and Siems, D. F., 2002, Mount Griggs: A compositionally distinctive Quaternary stratovolcano behind the main volcanic line in Katmai National Park: in Wilson, F. H. and Galloway, J. P., (eds.), Studies by the U.S. Geological Survey in Alaska, 2000, U.S. Geological Survey Professional Paper PP 1662, p. 87-112.
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Preliminary volcano-hazard assessment for the Katmai volcanic cluster, Alaska
"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 (ash) deposits. 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. Novarupta, a new vent in 1912, produced the world's largest eruption of the 20th century and sent ash around the globe. 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. More recently, a new vent on Trident produced lava flows and ash plumes for at least 20 years, lasting from 1953 to 1974. Postglacial eruptions, vigorous fumaroles on Griggs, Trident, Mageik, and Martin, and continuing seismicity are good evidence of the potentially active state of the entire Katmai cluster. Any eruption of these volcanoes could affect air traffic, both overhead and on the ground, with severity of the ash-cloud hazard depending on the size of the eruption. An explosive eruption like that of Novarupta, 1912, could affect air traffic all over the North Pacific, Alaska, Canada, and the conterminous United States. Such an eruption might interrupt and inconvenience national and international commerce, perhaps for months, but Alaskan commerce would be temporarily devastated."

Fierstein, Judy, and Hildreth, Wes, 2001, Preliminary volcano-hazard assessment for the Katmai volcanic cluster, Alaska: U.S. Geological Survey Open-File Report OF 00-0489, 50 p., 1 plate, scale not applicable.
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full-text PDF : 28.8 MB

Wood, C. A., and Kienle, Juergen, (eds.), 1990, Volcanoes of North America: United States and Canada: New York, Cambridge University Press, 354 p.

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Volcanism in the eastern Aleutian Arc: late Quaternary and Holocene centers, tectonic setting and petrology
Calc-alkaline volcanism and oceanic plate subduction are intimately linked in the eastern Aleutian arc. The volcanic arc is segmented: larger caldera-forming volcanic centers tend to be located near segment boundaries. Intrasegment volcanoes form smaller stratocones. Ten of the 22 volcanoes that make up the 540 km long volcanic front in the eastern Aleutian arc have erupted in recorded history and another six show hydrothermal activity.

Kienle, Juergen, and Swanson, S. E., 1983, Volcanism in the eastern Aleutian Arc: late Quaternary and Holocene centers, tectonic setting and petrology: Journal of Volcanology and Geothermal Research, v. 17, n. 1-4, p. 393-432.
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Ward, P. L., and Matumoto, T., 1967, A summary of volcanic and seismic activity in Katmai National Monument, Alaska: Bulletin Volcanologique, v. 31, p.107-129.

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Geology of the Mount Katmai area, Alaska

Keller, A. S., and Reiser, H. N., 1959, Geology of the Mount Katmai area, Alaska: U.S. Geological Survey Bulletin B 1058-G, p. 261-298, 2 sheets, scale 1:250,000.
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Muller, E. H., Juhle, R. W., and Coulter, H. W., 1954, Current volcanic activity in Katmai National Monument: in Luntey, R. S., Interim report on Katmai Project, Washington D.C., U.S. National Park Service, p. 62-66.

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