Alaska Volcano Observatory

Description Past Activity Images Maps Bibliography Prepare

Facts

Official Name: Bobrof Volcano
Seismically Monitored: No
Color Code: UNASSIGNED
Alert Level: UNASSIGNED
Elevation: 738m (2421ft)
Latitude: 51.9072
Longitude: -177.4409
Smithsonian VNum: 311100
Pronunciation:
Nearby Towns:
- Adak 35 mi (56 km) SE
- Atka 139 mi (224 km) NE
- Shemya Station 361 mi (581 km) NW
- Nikolski 368 mi (592 km) NE
- Attu Station 399 mi (642 km) NW
Distance from Anchorage: 1216 mi (1958 km)

Description

From Wood and Kienle (1990)^[1]: "Andesitic pyroclastic flows sampled at a seismic station (Adak network) are indicative of explosive eruptions; lavas at the same site indicate that more quiescent extrusive activity also occurred. Texturally, the rocks resemble those of Moffet volcano 50 km to the east. The geology of this small island and the timing of its volcanism are unknown."

Name Origin

Bobrof Volcano, comprising Bobrof Island, bears the name of the island. The name "Bobrof Island" was reported in 1790 by Commodore Joseph Billings. Captain Tebenkov (1852) published the name "O[strov] Bobrovoy Vilga" or "Sea Otter Vilga Island." (Orth, 1971). Bergsland (1994) reports the Unangam Tunuu name of Bobrof Island as "Walĝa", meaning "the one on this side (tribal boundary)."

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

0 Event Date(s)

Past Activity Legend:

	Eruption
	Questionable eruption
	Non-eruptive activity

A very rare clear view of the ridge at seismic/repeater site TAPA, Tanaga Island, western Aleutians. Bobrof and Kanaga Volcanoes are visible in the distance.

Bobrof Volcano with Tanaga Volcano in the upper left, Andreanof Islands, western Aleutians.

Fly-by of Bobrof Volcano with excellent views of the northeast and north sides of the edifice. Takawangha and Tanaga Volcanoes are visible in the background.

Stitched panorama image of the east side of Bobrof Island.

West flank of Bobrof Island on June 10, 2021.

Coastline of Bobrof Island from the north.

Summit of Kanaga Volcano with Bobrof and Tanaga Islands in the background. 2015 Western Aleutians AVO-USGS, NSF Geoprisms and Deep Carbon Observatory collaboration.

Bobrof Island viewed from the southeast. 2015 Western Aleutians AVO-USGS, NSF Geoprisms and Deep Carbon Observatory collaboration.

Topographic map of Bobrof Island, compiled in 1954. Army Map Series, Sheet 2524 I NE, Series Q801, Adak C-5 NE, Edition 1-AMS. Scale 1:25,000, Contour Interval 50 feet.

Showing 1 - 15 of 15

Map Images

By: U.S. Geological Survey
Topographic shaded relief map of Bobrof and Kanaga volcanoes.

By: AllTopo v7
Topographic map of Bobrof Island, compiled in 1954. Army Map Series, Sheet 2524 I NE, Series Q801, Adak C-5 NE, Edition 1-AMS. Scale 1:25,000, Contour Interval 50 feet.

Map References

Digital data for the reconnaissance geologic map of the western Aleutian islands, Alaska, 2006

Wilson, F.H., Mohadjer, Solmaz, Labay, K.A., Shew, Nora, and Grey, D.M., 2006, Digital data for the reconnaissance geologic map of the western Aleutian islands, Alaska: U.S. Geological Survey Open-File Report 2006-1302, 1 p., available online at http://pubs.usgs.gov/of/2006/1302/

link to publication on USGS website

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 .

website with links to sheets in PDF format

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.

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

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.

Reconnaissance geology of some western Aleutian Islands, Alaska, 1956

Coats, R. R., 1956, Reconnaissance geology of some western Aleutian Islands, Alaska: in Investigations of Alaskan volcanoes, U.S. Geological Survey Bulletin 1028-E, p. 83-100, 1 sheet, scale unknown.

full-text PDF 4.4 MB

plate 17 PDF 1.6 MB

References

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.

2018 update to the U.S. Geological Survey national volcanic threat assessment, 2018

Ewert, J.W., Diefenbach, A.K., and Ramsey, D.W., 2018, 2018 update to the U.S. Geological Survey national volcanic threat assessment: U.S. Geological Survey Scientific Investigations Report 2018-5140, 40 p., https://pubs.usgs.gov/sir/2018/5140/sir20185140.pdf.

download from USGS

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.

publication page at DGGS

AVO image database

Regional controls on volcano seismicity along the Aleutian Arc, 2014

Buurman, Helena, Nye, C.J., West, M.E., and Cameron, Cheryl, 2014, Regional controls on volcano seismicity along the Aleutian Arc: Geochemistry, Geophysics, Geosystems, doi:10.1002/2013GC005101

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 .

Subduction controls of Hf and Nd isotopes in lavas of the Aleutian island arc, 2010

Yogodzinski, G.M., Vervoort, J.D., Brown, S.T., and Gerseny, M., 2010. Subduction controls of Hf and Nd isotopes in lavas of the Aleutian island arc: Earth and Planetary Science Letters, v. 300, p. 226-238, doi: 10.1016/j.epsl.2010.09.035 .

Preliminary spreadsheet of eruption source parameters for volcanoes of the world, 2009

Mastin, L.G., Guffanti, Marianne, Ewert, J.E., and Spiegel, Jessica, 2009, Preliminary spreadsheet of eruption source parameters for volcanoes of the world: U.S. Geological Survey Open-File Report 2009-1133, v. 1.2, 25 p., available at http://pubs.usgs.gov/of/2009/1133/ .

Massive edifice failure at Aleutian arc volcanoes, 2007

Coombs, M.L., White, S.M., and Scholl, D.W., 2007, Massive edifice failure at Aleutian arc volcanoes: Earth and Planetary Science Letters, v. 256, p. 403-418, doi: 10.1016/j.epsl.2007.01.030.

System for ranking relative threats of U.S. volcanoes, 2007

Ewert, John, 2007, System for ranking relative threats of U.S. volcanoes: Natural Hazards Review, v. 8, n. 4, p. 112-124.

Digital data for the reconnaissance geologic map of the western Aleutian islands, Alaska, 2006

link to publication on USGS website

Volcanoes of the world: an illustrated catalog of Holocene volcanoes and their eruptions, 2003

Siebert, L., and Simkin, T., 2002-, Volcanoes of the world: an illustrated catalog of Holocene volcanoes and their eruptions: Smithsonian Institution, Global Volcanism Program Digital Information Series GVP-3, http://volcano.si.edu/search_volcano.cfm, unpaged internet resource.

website

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

Volcanoes of Alaska, 1998

website with links to sheets in PDF format

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.

Volcanoes of the world [2nd edition], 1994

Simkin, Tom, and Siebert, Lee, 1994, Volcanoes of the world [2nd edition]: Tucson, Arizona, Geoscience Press, 349 p.

Hard Copy held by AVO at FBKS - CEC shelf

The geology, geochemistry and petrology of the recent magmatic phase of the central and western Aleutian Arc, 1994

Myers, J. D., 1994, The geology, geochemistry and petrology of the recent magmatic phase of the central and western Aleutian Arc: unpublished manuscript unpaged.

Hard Copy held by AVO at FBKS - CEC shelf

Age, character, and significance of Aleutian arc volcanism, 1994

Fournelle, J. H., Marsh, B. D., and Myers, J. D., 1994, Age, character, and significance of Aleutian arc volcanism: in Plafker, George and Berg, H. C., (eds.), The Geology of Alaska, Geological Society of America The Geology of North America Series v. G-1, p. 723-758.

Aleut dictionary, Unangam Tunudgusii, an unabridged lexicon of the Aleutian, Pribilof, and Commander Islands Aleut language, 1994

Bergsland, Knut, comp., 1994, Aleut dictionary, Unangam Tunudgusii, an unabridged lexicon of the Aleutian, Pribilof, and Commander Islands Aleut language: University of Alaska Fairbanks, Alaska Native Language Center, 739 p.

Geothermal resources of the Aleutian Arc, 1993

Hard Copy held by AVO at FBKS - CEC shelf

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.

Hard Copy held by AVO at FBKS - CEC shelf

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

Tectonic controls on tholeiitic and calc-alkaline magmatism in the Aleutian arc, 1982

Kay, S. M., Kay, R. W., and Citron, G. P., 1982, Tectonic controls on tholeiitic and calc-alkaline magmatism in the Aleutian arc: Journal of Geophysical Research, v. 87, n. B5, p. 4051-4072.

Hard Copy held by AVO at FBKS - CEC file cabinet

Volcanoes of the world, 1981

Simkin, Tom, Siebert, Lee, McClelland, Lindsay, Bridge, David, Newhall, Christopher, and Latter, J. H., 1981, Volcanoes of the world: Stroudsburg, PA, Hutchinson Publishing Company, 233 p.

Comprehensive tables giving physical data and thermal energy estimates for young igneous systems of the United States, 1978

Smith, R. L., Shaw, H. R., Luedke, R. G., and Russell, S. L., 1978, Comprehensive tables giving physical data and thermal energy estimates for young igneous systems of the United States: U.S. Geological Survey Open-File Report 78-0925, p. 1-25.

Hard Copy held by AVO at FBKS - CEC shelf

Alaska Peninsula-Aleutian Islands, 1958

Powers, H. A., 1958, Alaska Peninsula-Aleutian Islands: in Williams, H., (ed.), Landscapes of Alaska, Los Angeles, CA, University of California Press, p. 61-75.

Reconnaissance geology of some western Aleutian Islands, Alaska, 1956

Coats, R. R., 1956, Reconnaissance geology of some western Aleutian Islands, Alaska: in Investigations of Alaskan volcanoes, U.S. Geological Survey Bulletin 1028-E, p. 83-100, 1 sheet, scale unknown.

full-text PDF 4.4 MB

plate 17 PDF 1.6 MB

Hard Copy held by AVO at FBKS - CEC file cabinet

	Red (Warning)
	Orange (Watch)
	Yellow (Advisory)
	Green (Normal)
	Uninstrumented
	Community
	Webcam
	Instrument
Earthquake Magnitude
0 7+
Earthquake Age
	Last 2 Hours
	Last 2 Days
	Last 1 Week

Alaska Volcano Observatory

Bobrof

Facts

Description

Name Origin

References Cited

[1] Volcanoes of North America: United States and Canada, 1990

Reported Activity

Modern Eruptions

0 Event Date(s)

Map Images

Map References

Digital data for the reconnaissance geologic map of the western Aleutian islands, Alaska, 2006

Volcanoes of Alaska, 1998

Volcanoes of Alaska, 1995

Geothermal resources of the Aleutian Arc, 1993

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

Reconnaissance geology of some western Aleutian Islands, Alaska, 1956

References

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

2018 update to the U.S. Geological Survey national volcanic threat assessment, 2018

Alaska Volcano Observatory image database, 2016

Regional controls on volcano seismicity along the Aleutian Arc, 2014

Preliminary database of Quaternary vents in Alaska, 2014

Subduction controls of Hf and Nd isotopes in lavas of the Aleutian island arc, 2010

Preliminary spreadsheet of eruption source parameters for volcanoes of the world, 2009

Massive edifice failure at Aleutian arc volcanoes, 2007

System for ranking relative threats of U.S. volcanoes, 2007

Digital data for the reconnaissance geologic map of the western Aleutian islands, Alaska, 2006

Volcanoes of the world: an illustrated catalog of Holocene volcanoes and their eruptions, 2003

Bibliography of information on Alaska volcanoes, 2003

Volcanoes of Alaska, 1998

Volcanoes of Alaska, 1995

Volcanoes of the world [2nd edition], 1994

The geology, geochemistry and petrology of the recent magmatic phase of the central and western Aleutian Arc, 1994

Age, character, and significance of Aleutian arc volcanism, 1994

Aleut dictionary, Unangam Tunudgusii, an unabridged lexicon of the Aleutian, Pribilof, and Commander Islands Aleut language, 1994

Geothermal resources of the Aleutian Arc, 1993

Volcanoes of North America: United States and Canada, 1990

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

Tectonic controls on tholeiitic and calc-alkaline magmatism in the Aleutian arc, 1982

Volcanoes of the world, 1981

Comprehensive tables giving physical data and thermal energy estimates for young igneous systems of the United States, 1978

Alaska Peninsula-Aleutian Islands, 1958

Reconnaissance geology of some western Aleutian Islands, Alaska, 1956

Reconnaissance geology of some western Aleutian Islands, 1947

United States coast pilot, Alaska Part 2, Yakutat Bay to Arctic Ocean, 1947

Past volcanic activity in the Aleutian arc,

Before an eruption

Ashfall & Preparedness Information

During and After an Eruption

Other Useful Links