Korovin 1986/5
Start: May 23, 1986 [1]
Event Type: Explosive
Max VEI: 1 [2]
- Central eruption [1]
- Phreatic [3]
Description: From Miller and others (1998): "Steam emission was observed in early May, 1986, and on May 23rd a 600 m steam plume containing some ash reportedly occurred soon after a 7.7 magnitude earthquake struck about 100 km to the southwest (Smithsonian Institution, 1986)."
From Smithsonian Institution (1986): "On 6 May], James Dickson noted a 500-m vertical steam plume over the SE part of the summit [of Korovin]. On 23 May at about 1730, Aleutian Air pilot Thomas Madsen noted a 600-m steam plume containing traces of ash rising above the rim of a 240-m-deep crater in the SE part of the summit area. A shallow magnitude 7.7 earthquake centered roughly 100 km [SSW] of Korovin at [51.52N, 174.78W] occurred 7 May [at 2247 GMT].
John Reeder and Kirk Swanson climbed [Korovin] in July 1983, observing only minor steaming from deep within the crater, rising to only 60 m above its floor."
Reeder (1989) adds the following information: "Pilot Harold Wilson of Peninsula Airways Inc. on 17 December 1986 observed an impressive above average steam plume from Korovin volcano that contained no detectable ash. The steam plume completely filled the crater of the volcano and it rose to a 2,250 m altitude (above 800 m above the crater rim) as measured by his Piper T1040 Navaho altimeter."
From Smithsonian Institution (1986): "On 6 May], James Dickson noted a 500-m vertical steam plume over the SE part of the summit [of Korovin]. On 23 May at about 1730, Aleutian Air pilot Thomas Madsen noted a 600-m steam plume containing traces of ash rising above the rim of a 240-m-deep crater in the SE part of the summit area. A shallow magnitude 7.7 earthquake centered roughly 100 km [SSW] of Korovin at [51.52N, 174.78W] occurred 7 May [at 2247 GMT].
John Reeder and Kirk Swanson climbed [Korovin] in July 1983, observing only minor steaming from deep within the crater, rising to only 60 m above its floor."
Reeder (1989) adds the following information: "Pilot Harold Wilson of Peninsula Airways Inc. on 17 December 1986 observed an impressive above average steam plume from Korovin volcano that contained no detectable ash. The steam plume completely filled the crater of the volcano and it rose to a 2,250 m altitude (above 800 m above the crater rim) as measured by his Piper T1040 Navaho altimeter."
References Cited
[1] Atka, 1986
Smithsonian Institution, 1986, Atka: Scientific Event Alert Network Bulletin v. 11, n. 05, unpaged.[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] Korovin, 1989
Reeder, J. W., 1989, Korovin: in Annual report of the world volcanic eruptions in 1986, Bulletin of Volcanic Eruptions, v. 26, p. 44-45.Complete Eruption References
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 
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
Atka, 1986
Smithsonian Institution, 1986, Atka: Scientific Event Alert Network Bulletin v. 11, n. 05, unpaged.
Korovin, 1989
Reeder, J. W., 1989, Korovin: in Annual report of the world volcanic eruptions in 1986, Bulletin of Volcanic Eruptions, v. 26, p. 44-45.
Hard Copy held by AVO at FBKS - CEC file cabinet