Kupreanof
Spurr
Great Sitkin
Legend
✕
 | Red (Warning) |
| Orange (Watch) |
| Yellow (Advisory) |
 | Green (Normal) |
| Uninstrumented |
| Community |
 | Webcam |
 | Instrument |
 | Earthquake |
Facts
- Official Name: Mount Kupreanof
- Seismically Monitored: No
- Color Code: UNASSIGNED
- Alert Level: UNASSIGNED
- Elevation: 1895m (6217ft)
- Latitude: 56.0126
- Longitude: -159.7912
- Smithsonian VNum: 312060
- Pronunciation:
-
Nearby Towns:
- Ivanof Bay 14 mi (22 km) SE
- Perryville 26 mi (42 km) SE
- Chignik Lake 43 mi (69 km) NE
- Chignik Lagoon 53 mi (85 km) NE
- Sand Point 54 mi (87 km) SW
Distance from Anchorage: 505 mi (813 km)
Description
From Wood and Kienle (1990) [1] : "The Stepovak Bay group is a chain of five volcanoes at the southwest end of a N40E oriented linear segment of the Aleutian arc on the Alaska Peninsula. This same segment includes the better known Veniaminof and Aniakchak calderas. Three of the Stepovak Bay volcanoes (2, 4, and Kupreanof) have clearly had Holocene eruptions, resulting in three small debris flows filling late Pleistocene glacial valleys, and a small cinder cone and associated lava flow. The other two volcanoes (1 and 3) do not show unmistakable evidence of Holocene activity. They have ice-filled summit craters 500 m (1) and 300 m (3) in diameter that may be late Pleistocene age. These volcanoes have contributed to extensive late Tertiary and Quaternary lava flows, some extending near sea level."Kupreanof is the largest and best known volcano of the group. In 1982, reconnaissance mapping located the three southernmost volcanoes. Later work further delineated these three, and located an additional center (4). Mapping and K-Ar dating indicate the area has been the locus of voluminous volcanic activity for approximately the last 4 million years. A fumarole occurs at Kupreanof volcano; another has been reported on volcano 4. Air photos from the late 1940s also suggest the presence of a fumarole on volcano 1.
"Northwest of the line of volcanoes a projected fault vertically offsets the volcanoes from flows that are related to the early history of the centers. These flows, which dip away from the centers, yield K-Ar ages between 3.9 and 1.7 Ma. Along the trend, and 7 to 12 km southwest of the volcanoes, is another area of early (?) Quaternary flows possibly related to a yet unrecognized center; outcrops of hypabyssal rocks in a snowfield among these flows may be this center. The group of volcanoes overlies sedimentary rocks of Oligocene to late Miocene age; the southern centers also overlie thick tuff deposits of uncertain but presumably late Tertiary or early Quaternary age."
References Cited
[1] Volcanoes of North America: United States and Canada, 1990
Wood, C. A., and Kienle, Juergen, (eds.), 1990, Volcanoes of North America: United States and Canada: New York, Cambridge University Press, 354 p.Reported Activity
Modern Eruptions
4 Event Date(s)
Past Activity Legend:
 |
Eruption |
 |
Questionable eruption |
 |
Non-eruptive activity |
Showing 1 - 18 of 18
Map Images
By:
U.S. Geological Survey
Topographic shaded relief map showing the locations of volcanoes in the Stepovak Bay volcano group: Kupreanof, and Volcanoes 1-4, Alaska.
Topographic shaded relief map showing the locations of volcanoes in the Stepovak Bay volcano group: Kupreanof, and Volcanoes 1-4, Alaska.
By:
Schaefer, J. R. G.
Alaska Peninsula volcanoes.
Alaska Peninsula volcanoes.
By:
Schaefer, Janet
Index map showing the location of Quaternary volcanoes on the Alaska peninsula.
Index map showing the location of Quaternary volcanoes on the Alaska peninsula.
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 .
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 .
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.
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.
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.
Quaternary geologic map of the Chignik and Sutwik Island quadrangles, Alaska, 1981
Detterman, R. L., Miller, T. P., Yount, M. E., and Wilson, F. H., 1981, Quaternary geologic map of the Chignik and Sutwik Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I 1292, unpaged, 1 sheet, scale 1:250,000.
Geologic map of the Chignik and Sutwik Island quadrangles, Alaska, 1981
Detterman, R. L., Miller, T. P., Yount, M. E., and Wilson, F. H., 1981, Geologic map of the Chignik and Sutwik Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I 1229, unpaged, 1 sheet, scale 1:250,000.
Maps showing interpretation of Landsat imagery of the Chignik and Sutwik Island quadrangles, Alaska, 1981
LeCompte, J. R., and Steele, W. C., 1981, Maps showing interpretation of Landsat imagery of the Chignik and Sutwik Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF 1053-O, unpaged, 2 plates, scale 1:250,000.
Gravity anomaly and interpretation map of the Chignik and Sutwik Island quadrangles, Alaska, 1981
Case, J. E., Barnes, D. F., Detterman, R. L., Morin, R. L., and Sikors, R. F., 1981, Gravity anomaly and interpretation map of the Chignik and Sutwik Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF 1053-J, unpaged, 1 plate, scale 1:250,000.
Maps and tables showing geochronology and whole rock geochemistry, Chignik and Sutwik Island quadrangles, Alaska, 1981
Wilson, F. H., Gaum, W. C., and Herzon, P. L., 1981, Maps and tables showing geochronology and whole rock geochemistry, Chignik and Sutwik Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF 1053-M, 3 p., 3 sheets, scale 1:250,000.
Aeromagnetic survey and interpretation, Chignik and Sutwik Island quadrangles, Alaska, 1981
Case, J. E., Cox, D. P., Detra, D. E., Detterman, R. L., and Wilson, F. H., 1981, Aeromagnetic survey and interpretation, Chignik and Sutwik Island quadrangles, Alaska: U.S. Geologic Survey Miscellaneous Field Studies Map MF 1053-B, 8 p., 2 plates, scale 1:250,000.
Generalized geologic map of Chignik and Sutwik Island quadrangles, Alaska, 1979
Detterman, R. L., Miller, T. P., Yount, M. E., and Wilson, F. H., 1979, Generalized geologic map of Chignik and Sutwik Island quadrangles, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I 1053, unpaged, 1 plate, scale 1:250,000.