Alaska Volcano Observatory
Okmok reported activity
EVENT SPECIFIC INFORMATION
Event Name : Cone A 1986/11
|Start:||November 18, 1986 ± 12 Hours||Observed|
|Stop:||February 26, 1988 ± 2 Days||Observed|
|Pyroclastic flow, surge, or nuee ardente: ||
|Tephra plume: ||
|Central eruption: ||
|Radial fissure: ||
|Duration: ||Intermittent for about 14 months ||
|MaxVEI: ||2 ||
|ColHeight: ||2100 m ||
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)."
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