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Alagogshak

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5 km
5 mi
Leaflet U.S. Department of the Interior | U.S. Geological Survey | Policies

Facts

  • Seismically Monitored: No
  • Color Code: UNASSIGNED
  • Alert Level: UNASSIGNED
  • Elevation: 1675m (5495ft)
  • Latitude: 58.15737
  • Longitude: -155.39839
  • Smithsonian VNum:
  • Pronunciation:
  • Nearby Towns:
    • Kanatak 47 mi (76 km) SW
    • Karluk 53 mi (86 km) SE
    • King Salmon 59 mi (94 km) NW
    • Larsen Bay 67 mi (109 km) SE
    • South Naknek 70 mi (112 km) NW

    Distance from Anchorage: 285 mi (459 km)

Description

From Hildreth and others (1999) [1] : "Alagogshak volcano, a newly recognized volcanic-front stratovolcano on the Alaska Peninsula rangecrest, 15 km southwest of Katmai Pass, produced 10-18 km3 of andesite-dacite eruptive products during several episodes of activity in the middle and late Pleistocene. From a central vent marked by hydrothermal alteration and remnants of a cratered fragmental cone on the present-day drainage divide, glacially incised stacks of lava flows (57-66 percent SiO,) dip radially and extend 6-10 km in most directions. Lava flows that make up four ridge-capping outliers well west of the volcano may also have erupted there. The medium-K calcalkaline Alagogshak eruptive suite is compositionally varied, probably reflecting independent evolution of different magma batches supplied in several episodes spread intermittently over at least 600,000 years."

Name Origin

"Alagogshak volcano" is an informal name, applied to this feature by Wes Hildreth, Judy Fierstein, Martin Lanphere, and David Siems. The volcano's name is derived from nearby Alagogshak Creek. Alagogshak Creek is a Native name published by Griggs (1922), as "Alagogshuk Creek" (Orth, 1971).

References Cited

[1] Alagogshak volcano: A Pleistocene andesite-dacite stratovolcano in Katmai National Park, 1999

Hildreth, W., Fierstein, J., Lanphere, M. A., and Siems, D. F., 1999, Alagogshak volcano: A Pleistocene andesite-dacite stratovolcano in Katmai National Park: in Kelley, K.D. (ed.), Geologic studies in Alaska by the U.S. Geological Survey, 1997, U.S. Geological Survey Professional Paper PP 1614, p. 105-113.
full-text PDF 504 KB

Reported Activity

Modern Eruptions

1 Event Date(s)

Past Activity Legend:
Eruption
Questionable eruption
Non-eruptive activity


Showing 1 - 8 of 8

Map Images

Map References

Map showing distribution, composition, and age of Late Cenozoic volcanic centers in Alaska, 1986

Luedke, R. G., and Smith, R. L., 1986, Map showing distribution, composition, and age of Late Cenozoic volcanic centers in Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I 1091-F, unpaged, 3 sheets, scale 1:1,000,000.

References

Understanding drivers of mercury in lake trout (Salvelinus namaycush), a top-predator fish in southwest Alaska's parklands, 2023

Bartz, K.K., Hannam, M.P., Wilson, T.L., Lepak, R.F., Ogorek, J.M., Young, D.B., Eagles-Smith, C.A., and Krabbenhoft, D.P., 2023, Understanding drivers of mercury in lake trout (Salvelinus namaycush), a top-predator fish in southwest Alaska's parklands: Environmental Pollution v. 330, 121678. https://doi.org/10.1016/j.envpol.2023.121678
Full-text PDF 3.8 MB

Geologic database of information on volcanoes in Alaska (GeoDIVA), 2022

Cameron, C.E., Crass, S.W., and AVO Staff, eds, 2022, Geologic database of information on volcanoes in Alaska (GeoDIVA): Alaska Division of Geologic and Geophysical Surveys Digital Data Series 20, https://doi.org/10.14509/geodiva, https://doi.org/10.14509/30901.

Alaska Volcano Observatory image database, 2016

Cameron, C.E., and Snedigar, S.F., 2016, Alaska Volcano Observatory image database: Alaska Division of Geological & Geophysical Surveys Digital Data Series 13, https://www.avo.alaska.edu/images/. https://doi.org/10.14509/29689.

Three-dimensional seismic velocity structure and earthquake relocations at Katmai, Alaska, 2014

Murphy, Rachel, Thurber, Clifford, Prejean, Stephanie, and Bennington, Ninfa, 2014, Three-dimensional seismic velocity structure and earthquake relocations at Katmai, Alaska: Journal of Volcanology and Geothermal Research, v. 276, p. 121-131, doi:10.1016/j.jvolgeores.2014.02.22

Preliminary database of Quaternary vents in Alaska, 2014

Cameron, C.E., and Nye, C.J., 2014, Preliminary database of Quaternary vents in Alaska: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 153, 11 p., doi:10.14509/27357 .

Katmai scientific studies, 2012

Winfree, Robert, with contributions from Bacon, C.R., Bennett, A.J., Bennington, Ninfa, Berg, E.E., Brooks, Margi, Coletti, H.A., Coombs, M.L., Fierstein, Judy, Freeburg, Gary, Frost, G.V., Haney, Matthew, Jorgenson, M.T., Miller, A.E., Moran, Seth, Murphy, Rachel, Partnow, Patricia, Paskievitch, John, Stevens, D.P., Powell, Lee, Power, John, Prejean, S.G., Schaaf, Jeanne, Sherriff, R.L., Thurber, Clifford, and Welchman, R.A., 2012, Katmai science studies: Alaska Park Science Journal, v. 11, n. 1, 96 p., available online at http://www.nps.gov/akso/nature/science/ak_park_science/volume_11_issue_1.cfm .

Katmai National Park volcanoes, 2012

Fierstein, Judy, 2012, Katmai National Park volcanoes: in Winfree, Robert (project lead), Katmai Science Studies: Alaska Park Science Journal, v. 11, n. 1, p. 14-21, available online at http://www.nps.gov/akso/nature/science/ak_park_science/volume_11_issue_1.cfm .
Hard Copy held by AVO at FBKS - CEC shelf

Explosive eruptive record in the Katmai region, Alaska Peninsula: an overview, 2007

Fierstein, Judy, 2007, Explosive eruptive record in the Katmai region, Alaska Peninsula: an overview: Bulletin of Volcanology, v. 69, n. 5, p. 469-509, doi:10.1007/s00445-006-0097-y.

Bibliography of information on Alaska volcanoes, 2003

Cameron, C. E., Triplehorn, J. H., and Robar, C. L., 2003, Bibliography of information on Alaska volcanoes: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication MP 131, 1 CD-ROM.
Hard Copy held by AVO at FBKS - CEC file cabinet

The great eruption of 1912, 2002

Adleman, Jennifer, 2002, The great eruption of 1912: National Park Service Alaska Park Science Winter 2002, Anchorage, AK, http://www.arlis.org/docs/vol1/52558645/52558645v1no1.pdf , p. 4-11.
full-text PDF 1.6 MB
Hard Copy held by AVO at FBKS - CEC file cabinet

Katmai geology guide, 2002

Riehle, Jim, 2002, Katmai geology guide: Publication Consultants, 112 p.

Alagogshak volcano: A Pleistocene andesite-dacite stratovolcano in Katmai National Park, 1999

Hildreth, W., Fierstein, J., Lanphere, M. A., and Siems, D. F., 1999, Alagogshak volcano: A Pleistocene andesite-dacite stratovolcano in Katmai National Park: in Kelley, K.D. (ed.), Geologic studies in Alaska by the U.S. Geological Survey, 1997, U.S. Geological Survey Professional Paper PP 1614, p. 105-113.
full-text PDF 504 KB

July-August 1997, 1997

Alaska Volcano Observatory, 1997, July-August 1997: Alaska Volcano Observatory Bimonthly Report, v. 9, n. 4, 31 p.
Part 1 PDF 446 KB
Part 2 PDF 435 KB
Part 3 PDF 2 MB

Mesozoic macrofossil locality map, checklists, and pre-Quaternary stratigraphic section of the Mt. Katmai and adjacent parts of the Afognak and Naknek quadrangles, Alaska Peninsula, Alaska, 1995

Miller, J.W., Elder, W.P., and Detterman, R.L., 1995, Mesozoic macrofossil locality map, checklists, and pre-Quaternary stratigraphic section of the Mt. Katmai and adjacent parts of the Afognak and Naknek quadrangles, Alaska Peninsula, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map 2021-G, 3 sheets. https://doi.org/10.3133/mf2021G

Map showing distribution, composition, and age of Late Cenozoic volcanic centers in Alaska, 1986

Luedke, R. G., and Smith, R. L., 1986, Map showing distribution, composition, and age of Late Cenozoic volcanic centers in Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I 1091-F, unpaged, 3 sheets, scale 1:1,000,000.

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