Bogoslof 1992/7
Start: 15:00:00 July 6, 1992 [1]
Stop: July 24, 1992 [1]
Event Type: Explosive
Max VEI: 3 [2]
Description: McGimsey and others (1995) summarize this eruption as follows: "The recent eruption began in early July, 1992. At about 3:00 pm ADT on July 6, an eruption cloud rising to 3 km above Bogoslof Island was identified on NOAA satellite imagery. A few hours later pilots visually confirmed the steam and ash plume.
"Satellite imagery showed intermittent small plumes through July 13. Continuous emission occurred during the next two days with the steam and ash plume rising up to 5.5 km and extending 100 km to the SE. At 4:23 pm ADT on July 17 pilots reported a rapidly rising mushroom-shaped plume up to 4.5 km altitude. Inclement weather prevented direct observation of the island. The activity remained intermittent with an episode of vigorous steam and ash emission beginning about 5:00 pm ADT on July 20 that produced a plume as high as 8 km by 1725. A profusely steaming new lava dome at the north end of the island adjacent to the 1927 dome was first sighted on July 21 and confirmed by U.S. Coast Guard observations and photography on July 24. The last report of steaming and minor ash emission was July 24, and except for residual steaming of the dome, activity had subsided by late July, 1992.
"AVO responded to the eruption by compiling pilot reports, monitoring satellite imagery for ash plumes, collecting photographs and video footage of the activity, and disseminating information to government agencies and the media.
"U.S. Fish and Wildlife Service (USFWS) scientists who approached the island by ship several times later in the summer to assess the impact on sea mammals and birds photographed the new dome. During the summer of 1994, an AVO scientist spent a day examining the island and collecting samples of the new lava dome (Harbin, 1994)."
"The dome, measuring 150 m x 275 m across and approximately 150 m high, has a steep-sided central spire surrounded by prismatically jointed, block debris that originally formed more gentle slopes [see figure 11 in original text]. By the summer of 1994, the northern and northwestern sides of the dome had been reduced to sheer sea cliffs. The dome is composed principally of gray to black porphyritic hornblende-andesite (Harbin, 1994)."
Reeder and McGimsey (1995) report an approximate dome volume for this eruption as 1.6x10^6 cubic meters.
"Satellite imagery showed intermittent small plumes through July 13. Continuous emission occurred during the next two days with the steam and ash plume rising up to 5.5 km and extending 100 km to the SE. At 4:23 pm ADT on July 17 pilots reported a rapidly rising mushroom-shaped plume up to 4.5 km altitude. Inclement weather prevented direct observation of the island. The activity remained intermittent with an episode of vigorous steam and ash emission beginning about 5:00 pm ADT on July 20 that produced a plume as high as 8 km by 1725. A profusely steaming new lava dome at the north end of the island adjacent to the 1927 dome was first sighted on July 21 and confirmed by U.S. Coast Guard observations and photography on July 24. The last report of steaming and minor ash emission was July 24, and except for residual steaming of the dome, activity had subsided by late July, 1992.
"AVO responded to the eruption by compiling pilot reports, monitoring satellite imagery for ash plumes, collecting photographs and video footage of the activity, and disseminating information to government agencies and the media.
"U.S. Fish and Wildlife Service (USFWS) scientists who approached the island by ship several times later in the summer to assess the impact on sea mammals and birds photographed the new dome. During the summer of 1994, an AVO scientist spent a day examining the island and collecting samples of the new lava dome (Harbin, 1994)."
"The dome, measuring 150 m x 275 m across and approximately 150 m high, has a steep-sided central spire surrounded by prismatically jointed, block debris that originally formed more gentle slopes [see figure 11 in original text]. By the summer of 1994, the northern and northwestern sides of the dome had been reduced to sheer sea cliffs. The dome is composed principally of gray to black porphyritic hornblende-andesite (Harbin, 1994)."
Reeder and McGimsey (1995) report an approximate dome volume for this eruption as 1.6x10^6 cubic meters.
References Cited
[1] Volcanic activity in Alaska: Summary of events and response of the Alaska Volcano Observatory 1992, 1995
McGimsey, R. G., Neal, C. A., and Doukas, M. P., 1995, Volcanic activity in Alaska: Summary of events and response of the Alaska Volcano Observatory 1992: U.S. Geological Survey Open-File Report 95-83, 26 p.[2] 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.[3] Bogoslof, 1992
Smithsonian Institution, 1992, Bogoslof: Global Volcanism Network Bulletin v. 17, n. 07, unpaged.[4] The dome-forming July 1992 eruption of Bogoslof Island, Alaska, 1992
Shaishnikoff, L., Reeder, J. W., and Mowatt, T. C., 1992, The dome-forming July 1992 eruption of Bogoslof Island, Alaska [abs.]: Eos, v. 73, n. 43, p. 636.[5] Observations of the 1992 lava dome, Bogoslof Island, eastern Aleutian Arc, Alaska, 1994
Harbin, M. L., 1994, Observations of the 1992 lava dome, Bogoslof Island, eastern Aleutian Arc, Alaska [abs.]: Eos, v. 75, n. 44, p. 737.[6] Bogoslof, 1992
Smithsonian Institution, 1992, Bogoslof: Global Volcanism Network Bulletin v. 17, n. 06, unpaged.[7] 10 years of volcanic activity in Alaska: 1983-1992: A video (Pyre Peak, Akutan, Bogoslof, Westdahl, Veniaminof, Augustine, Redoubt, and Spurr volcanoes), 1995
Doukas, M. P., McGimsey, R. G., and Dorava, J. M., 1995, 10 years of volcanic activity in Alaska: 1983-1992: A video (Pyre Peak, Akutan, Bogoslof, Westdahl, Veniaminof, Augustine, Redoubt, and Spurr volcanoes): U.S. Geological Survey Open-File Report 95-0061-A, Anchorage, AK, KAKM Video, 1 videocassette.[8] Bogoslof, 1995
Reeder, J. W., and McGimsey, R. G., 1995, Bogoslof: in Annual report of the world volcanic eruptions in 1992, Bulletin of Volcanic Eruptions, v. 32, p. 88-91.[9] Quick reference to Alaska's active volcanoes and listing of historical eruptions, 1760-1994, 1995
McGimsey, R. G., and Miller, T. P., 1995, Quick reference to Alaska's active volcanoes and listing of historical eruptions, 1760-1994: U.S. Geological Survey Open-File Report 95-0520, 13 p.[10] 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.
Complete Eruption References
Bogoslof, 1992
Smithsonian Institution, 1992, Bogoslof: Global Volcanism Network Bulletin v. 17, n. 06, unpaged.
Bogoslof, 1992
Smithsonian Institution, 1992, Bogoslof: Global Volcanism Network Bulletin v. 17, n. 07, unpaged.
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.
The dome-forming July 1992 eruption of Bogoslof Island, Alaska, 1992
Shaishnikoff, L., Reeder, J. W., and Mowatt, T. C., 1992, The dome-forming July 1992 eruption of Bogoslof Island, Alaska [abs.]: Eos, v. 73, n. 43, p. 636.
Hard Copy held by AVO at FBKS - CEC file cabinet
Observations of the 1992 lava dome, Bogoslof Island, eastern Aleutian Arc, Alaska, 1994
Harbin, M. L., 1994, Observations of the 1992 lava dome, Bogoslof Island, eastern Aleutian Arc, Alaska [abs.]: Eos, v. 75, n. 44, p. 737.
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
Volcanic activity in Alaska: Summary of events and response of the Alaska Volcano Observatory 1992, 1995
McGimsey, R. G., Neal, C. A., and Doukas, M. P., 1995, Volcanic activity in Alaska: Summary of events and response of the Alaska Volcano Observatory 1992: U.S. Geological Survey Open-File Report 95-83, 26 p.
Hard Copy held by AVO at FBKS - CEC shelf
10 years of volcanic activity in Alaska: 1983-1992: A video (Pyre Peak, Akutan, Bogoslof, Westdahl, Veniaminof, Augustine, Redoubt, and Spurr volcanoes), 1995
Doukas, M. P., McGimsey, R. G., and Dorava, J. M., 1995, 10 years of volcanic activity in Alaska: 1983-1992: A video (Pyre Peak, Akutan, Bogoslof, Westdahl, Veniaminof, Augustine, Redoubt, and Spurr volcanoes): U.S. Geological Survey Open-File Report 95-0061-A, Anchorage, AK, KAKM Video, 1 videocassette.
Hard Copy held by AVO at FBKS - CEC shelf
Bogoslof, 1995
Reeder, J. W., and McGimsey, R. G., 1995, Bogoslof: in Annual report of the world volcanic eruptions in 1992, Bulletin of Volcanic Eruptions, v. 32, p. 88-91.
Hard Copy held by AVO at FBKS - CEC file cabinet