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Okmok reported activity

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EVENT SPECIFIC INFORMATION

Event Name : Cone A 1986/11

Start:November 18, 1986 ± 12 HoursObserved
Stop:February 26, 1988 ± 2 DaysObserved

Tephrafall: BibCard BibCard BibCard
Pyroclastic flow, surge, or nuee ardente: BibCard
Tephra plume: BibCard BibCard BibCard BibCard BibCard BibCard BibCard BibCard BibCard BibCard BibCard
Central eruption: BibCard BibCard BibCard BibCard BibCard BibCard BibCard BibCard BibCard BibCard BibCard BibCard
Radial fissure: BibCard BibCard BibCard
Eruption Type:Explosive
MaxVEI: 2 BibCard
ColHeight: 2100 m BibCard
Duration: Intermittent for about 14 months BibCard

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)."

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