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.

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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.

plate 17 PDF 1.6 MB

	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

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