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Mount Katmai description and information

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Official Name: Mount Katmai
Type:Stratovolcano with central caldera
Most Recent Activity:September 21, 2003
Seismically Monitored: Yes
Color Code:GREEN
Alert Level:NORMAL
Elevation: 6716 ft (2047 m)
Latitude: 58.279° N
Longitude:154.9533° W
Quadrangle:Mt Katmai
CAVW Number:312170
Pronunciation: Sound file
Associated Features:Horseshoe Island
Nearby towns:Karluk 52 mi (84 km) SE
Larsen Bay 62 mi (100 km) SE
Kanatak 63 mi (102 km) SW
King Salmon 68 mi (109 km) NW
Anchorage 268 mi (432 km) NE
DESCRIPTION
From Miller and others (1998) [1]: "Katmai volcano is a large stratovolcano about 10 km in diameter with a central lake-filled caldera whose rim is about 4.2 by 2.5 km in area. The caldera rim has a maximum elevation of 2047 m and in 1975 the lake surface was at an elevation of about 1236 m. The estimated elevation of the caldera floor is about 995 m.

"The volcano is one of five stratovolcanoes near the Novarupta dome, source of the voluminous pyroclastic flows erupted in 1912 [2]. It consists chiefly of lava flows, pyroclastic rocks, and non-welded to agglutinated air fall (Fenner, 1920; Hildreth, 1983). The Quaternary volcanic rocks at Katmai and adjacent cones are less than 1500 m thick [2]. Much of the volcano is mantled by snow and ice and several valley glaciers radiate out from the flanks and three glaciers originating from the upper caldera walls descend into the crater to the lake (Motyka and Benson, 1975).

"Katmai volcano is built on the sedimentary rocks of the Naknek Formation of Late Jurassic age, which are exposed just west of the caldera rim at an elevation of about 1520 m, as well as north and southeast of the crater [3] [4]"

REFERENCES CITED
[1]
Catalog of the historically active volcanoes of Alaska, 1998
citation imageMiller, T. P., McGimsey, R. G., Richter, D. H., Riehle, J. R., Nye, C. J., Yount, M. E., and Dumoulin, J. A., 1998, Catalog of the historically active volcanoes of Alaska: U.S. Geological Survey Open-File Report OF 98-0582, 104 p.
Download PDF title page PDF : 52
Download PDF intro and TOC PDF : 268 KB
Download PDF eastern part - Wrangell to Ukinrek Maars PDF : 972 KB
Download PDF central part - Chiginagak to Cleveland PDF : 2,463 KB
Download PDF western part - Carlisle to Kiska PDF : 956 KB
Download PDF references PDF : 43 KB

[2]
The compositionally zoned eruption of 1912 in the Valley of Ten Thousand Smokes, Katmai National Park, Alaska, 1983
citation imageHildreth, Wes, 1983, The compositionally zoned eruption of 1912 in the Valley of Ten Thousand Smokes, Katmai National Park, Alaska: Journal of Volcanology and Geothermal Research, v. 18, n. 1-4, p. 1-56.

[3]
The stratigraphy of the ejecta from the 1912 eruption of Mount Katmai and Novarupta, Alaska, 1968
Curtis, G. H., 1968, The stratigraphy of the ejecta from the 1912 eruption of Mount Katmai and Novarupta, Alaska: in Coats, R. R., Hay, R. L., and Anderson, C. A., (eds.), Studies in volcanology, Geological Society of America Memoir MWR 0116, p. 153-210.

[4]
Preliminary geologic map of the Mt. Katmai quadrangle and portions of the Afognak and Naknek quadrangles, Alaska, 1987
Riehle, J. R., Detterman, R. L., Yount, M. E., and Miller, J. W., 1987, Preliminary geologic map of the Mt. Katmai quadrangle and portions of the Afognak and Naknek quadrangles, Alaska: U.S. Geological Survey Open-File Report OF 87-0593, unpaged, 1 sheet, scale 1:250,000.

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