Cone A 1986/11
Start: 13:20:00 November 18, 1986 ± 12 Hours [1]
Stop: February 26, 1988 ± 2 Days [2]
Event Type: Explosive
Max VEI: 2 [3]
- Pyroclastic flow, surge, or nuee ardente [13]
Description: From Miller and others (1998): "A commercial pilot reported a steam and ash plume above a cinder cone (probably the 1945 cone) in the southwestern part of the caldera on November 18, 1986. Another small ash eruption occurred from the same cone on January 5, 1987 about 13 hours after a shallow, magnitude 6.6 (Ms) earthquake struck 130 km south of Okmok. A small pyroclastic flow was produced on the southeast flank of the cone and ash emission from the cone continued intermittently from January 1987 to February 1988 (Smithsonian Institution, 1986, 1987, 1988)."
References Cited
[1] Okmok, 1986
Smithsonian Institution, 1986, Okmok: Scientific Event Alert Network Bulletin v. 11, n. 12, unpaged.[2] Okmok, 1988
Smithsonian Institution, 1988, Okmok: Scientific Event Alert Network Bulletin v. 13, n. 02, unpaged.[3] 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.[4] Okmok, 1987
Smithsonian Institution, 1987, Okmok: Scientific Event Alert Network Bulletin v. 12, n. 01, unpaged.[5] Okmok, 1987
Smithsonian Institution, 1987, Okmok: Scientific Event Alert Network Bulletin v. 12, n. 03, unpaged.[6] Okmok, 1987
Smithsonian Institution, 1987, Okmok: Scientific Event Alert Network Bulletin v. 12, n. 06, unpaged.[7] Okmok, 1987
Smithsonian Institution, 1987, Okmok: Scientific Event Alert Network Bulletin v. 12, n. 07, unpaged.[8] Okmok, 1987
Smithsonian Institution, 1987, Okmok: Scientific Event Alert Network Bulletin v. 12, n. 11, unpaged.[9] Okmok, 1987
Smithsonian Institution, 1987, Okmok: Scientific Event Alert Network Bulletin v. 12, n. 12, unpaged.[10] Okmok, 1989
Reeder, J. W., 1989, Okmok: in Annual report of the world volcanic eruptions in 1986, Bulletin of Volcanic Eruptions, v. 26, p. 47-.[11] Okmok, 1990
Reeder, J. W., 1990, Okmok: in Annual report of the world volcanic eruptions in 1987, Bulletin of Volcanic Eruptions, v. 27, p. 44-46.[12] Okmok, 1991
Reeder, J. W., 1991, Okmok: in Annual report of the world volcanic eruptions in 1988, Bulletin of Volcanic Eruptions, v. 28, p. 58-60.[13] 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.
intro and TOC PDF 268 KB
references PDF 43 KB Complete Eruption References
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
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.
intro and TOC PDF 268 KB
references PDF 43 KB 
Post-caldera eruptions at Okmok volcano, Umnak Island, Alaska, with emphasis on recent eruptions from Cone A, 2003
Grey, D. M., 2003, Post-caldera eruptions at Okmok volcano, Umnak Island, Alaska, with emphasis on recent eruptions from Cone A: University of Alaska Fairbanks unpublished M.S. thesis, 135 p.
Hard Copy held by AVO at FBKS - CEC file cabinet
Okmok, 1986
Smithsonian Institution, 1986, Okmok: Scientific Event Alert Network Bulletin v. 11, n. 12, unpaged.
Okmok, 1987
Smithsonian Institution, 1987, Okmok: Scientific Event Alert Network Bulletin v. 12, n. 01, unpaged.
Okmok, 1987
Smithsonian Institution, 1987, Okmok: Scientific Event Alert Network Bulletin v. 12, n. 03, unpaged.
Okmok, 1987
Smithsonian Institution, 1987, Okmok: Scientific Event Alert Network Bulletin v. 12, n. 06, unpaged.
Okmok, 1987
Smithsonian Institution, 1987, Okmok: Scientific Event Alert Network Bulletin v. 12, n. 07, unpaged.
Okmok, 1987
Smithsonian Institution, 1987, Okmok: Scientific Event Alert Network Bulletin v. 12, n. 11, unpaged.
Okmok, 1987
Smithsonian Institution, 1987, Okmok: Scientific Event Alert Network Bulletin v. 12, n. 12, unpaged.
Okmok, 1988
Smithsonian Institution, 1988, Okmok: Scientific Event Alert Network Bulletin v. 13, n. 02, unpaged.
Okmok, 1989
Reeder, J. W., 1989, Okmok: in Annual report of the world volcanic eruptions in 1986, Bulletin of Volcanic Eruptions, v. 26, p. 47-.
Hard Copy held by AVO at FBKS - CEC file cabinet
Okmok, 1990
Reeder, J. W., 1990, Okmok: in Annual report of the world volcanic eruptions in 1987, Bulletin of Volcanic Eruptions, v. 27, p. 44-46.
Hard Copy held by AVO at FBKS - CEC file cabinet
Okmok, 1991
Reeder, J. W., 1991, Okmok: in Annual report of the world volcanic eruptions in 1988, Bulletin of Volcanic Eruptions, v. 28, p. 58-60.
Hard Copy held by AVO at FBKS - CEC file cabinet
1997 volcanic activity in Alaska and Kamchatka: Summary of events and response of the Alaska Volcano Observatory, 1999
McGimsey, R. G., and Wallace, K. L., 1999, 1997 volcanic activity in Alaska and Kamchatka: Summary of events and response of the Alaska Volcano Observatory: U.S. Geological Survey Open-File Report 99-0448, 42 p.
full-text PDF 17 MB 