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Seguam

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Uninstrumented
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Earthquake Magnitude
0 7+
Earthquake Age
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5 km
5 mi
Leaflet U.S. Department of the Interior | U.S. Geological Survey | Policies

Facts

  • Official Name: Seguam Island
  • Seismically Monitored: No
  • Color Code: UNASSIGNED
  • Alert Level: UNASSIGNED
  • Elevation: 1054m (3458ft)
  • Latitude: 52.316
  • Longitude: -172.51
  • Smithsonian VNum: 311180
  • Pronunciation:
  • Nearby Towns:
    • Atka 72 mi (116 km) SW
    • Nikolski 159 mi (255 km) NE
    • Adak 177 mi (286 km) SW
    • Unalaska 270 mi (435 km) NE
    • Akutan 306 mi (492 km) NE

    Distance from Anchorage: 1045 mi (1683 km)

  • Subfeatures:
    • Pyre Peak
    • Wilcox
    • Moundhill

Description

From Miller and others (1998) [1] : "Seguam Island consists of the remnants of two late Quaternary calderas. Holocene volcanic cones occur in both of the calderas and a third Holocene cone lies at the east end of the island. Pyre Peak, commonly referred to as Sequam volcano, highest of the young cones, dominates the western half of the island and occupies the center of the western caldera [2] that is defined by remnants of a semi-circular ridge about 3 km in original diameter and about 700 m high. A Holocene basalt field surrounds Pyre Peak [2] extending down to shoreline. This general area has been the site of most if not all historical volcanic activity. Late Quaternary lavas and pyroclastic rocks ranging in age from 1.1 Ma to 0.03 Ma underlie the basalt. The two Holocene cones to the east are surrounded by andesite and dacite lava flows with well preserved constructional features [2] ."

Name Origin

Seguam Island was called "Ostrov Seguam" by Lieutenant Sarichev, from an Unangam Tunuu name. Lutke called it "Segouam ile" and "Gorely Ile (1836). "Goreli" is Russian for "burnt" (Orth, 1971).

References Cited

[1] Catalog of the historically active volcanoes of Alaska, 1998

Miller, 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 98-0582, 104 p.

[2] Mid-Pleistocene lavas from the Seguam volcanic center, central Aleutian arc: closed-system fractional crystallization of a basalt to rhyodacite eruptive suite, 1992

Singer, B. S., Myers, J. D., and Frost, C. D., 1992, Mid-Pleistocene lavas from the Seguam volcanic center, central Aleutian arc: closed-system fractional crystallization of a basalt to rhyodacite eruptive suite: Contributions to Mineralogy and Petrology, v. 110, p. 87-112.

Reported Activity

Modern Eruptions

13 Event Date(s)

Past Activity Legend:
Eruption
Questionable eruption
Non-eruptive activity


Showing 1 - 20 of 30

Map Images

Map References

Recently active volcanoes of Alaska, 2023

Cameron, C.E., Bull, K.F., and Macpherson, A.E., 2023, Recently active volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 133 v. 6, 2 sheets. https://doi.org/10.14509/31086.

Historically active volcanoes of Alaska, v. 3, 2018

Cameron, C.E., Schaefer, J.R., and Mulliken, K.M., 2018, Historically active volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 133 v. 3, 2 sheets. Http://doi.org/10.14509/30142

Historically active volcanoes of Alaska, 2014

Schaefer, J.R., Cameron, C.E., and Nye, C.J., 2014, Historically active volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 133 v. 1.2, 1 sheet, scale 1:3,000,000. This publication has been superseded. Newest version available at http://www.dggs.alaska.gov/pubs/id/20181 .

Historically active volcanoes of the Aleutian Arc, 2002

Schaefer, Janet, and Nye, C. J., 2002, Historically active volcanoes of the Aleutian Arc: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication MP 0123, unpaged, 1 sheet, scale 1:3,000,000. Superceded by Miscellaneous Publication 133: http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=20181

Volcanoes of Alaska, 1998

Nye, C. J., Queen, Katherine, and McCarthy, A. M., 1998, Volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular IC 0038, unpaged, 1 sheet, scale 1:4,000,000, available at http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=7043 .
Hard Copy held by AVO at FBKS - CEC shelf

Volcanoes of Alaska, 1995

Alaska Division of Geological & Geophysical Surveys, 1995, Volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular IC 0038, unpaged, 1 sheet, scale 1:4,000,000.

Aleutian arc volcanoes, 1994

Nye, C. J., 1994, Aleutian arc volcanoes: Alaska Division of Geological & Geophysical Surveys Public-Data File PDF 94-54, unpaged, 1 sheet, scale 1:2,126,841.

Geothermal resources of the Aleutian Arc, 1993

Motyka, R. J., Liss, S. A., Nye, C. J., and Moorman, M. A., 1993, Geothermal resources of the Aleutian Arc: Alaska Division of Geological & Geophysical Surveys Professional Report PR 0114, 17 p., 4 sheets, scale 1:1,000,000.
Hard Copy held by AVO at FBKS - CEC shelf

Holocene volcanoes of the Aleutian Arc, Alaska, 1993

March, G. D., 1993, Holocene volcanoes of the Aleutian Arc, Alaska: Alaska Division of Geological & Geophysical Surveys Public-Data File PDF 93-85, unpaged, 1 sheet, scale 1:2,000,000.

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.

Geothermal energy resources of Alaska, 1980

Turner, D. L., Forbes, R. B., Albanese, Mary, Macbeth, Joyce, Lockhart, A. B., and Seed, S. M., 1980, Geothermal energy resources of Alaska: University of Alaska Fairbanks Geophysical Institute Report UAG-R 279, 19 p., 3 sheets, scale 1 at 1:2,500,000.

Volcanic activity in the Aleutian Arc, 1950

Coats, R. R., 1950, Volcanic activity in the Aleutian Arc: U.S. Geological Survey Bulletin 0974-B, p. 35-49, 1 sheet, scale 1:5,000,000.
plate 1 PDF 819 KB
full-text PDF 783 KB
Hard Copy held by AVO at FBKS - CEC shelf

Reconnaissance of the gold fields of southern Alaska with some notes on general geology, 1898

Becker, G. F., 1898, Reconnaissance of the gold fields of southern Alaska with some notes on general geology: U.S. Geological Survey Annual Report 0018, p. 1-86, 6 sheets, scale unknown.
full-text PDF 1.5 MB
Hard Copy held by AVO at FBKS - CEC file cabinet

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