Report on Bogoslof (United States) — 14 December-20 December 2016

Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 14 December-20 December 2016
Managing Editor: Sally Kuhn Sennert

Please cite this report as:

Global Volcanism Program, 2016. Report on Bogoslof (United States). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 14 December-20 December 2016. Smithsonian Institution and US Geological Survey.

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Bogoslof

United States

53.93°N, 168.03°W; summit elev. 150 m

All times are local (unless otherwise noted)


AVO reported that a short-lived explosive eruption at Bogoslof, observed and reported by several pilots around 1600 on 20 December, produced an ash plume that rose to 10.3 km (34,000 ft) a.s.l. A subsequent pilot report made 50 minutes later indicated that activity had decreased. Satellite data showed a discrete, short-lived explosion just prior to 1600, and a detached plume that drifted S. AVO raised the Aviation Color Code to Red and the Volcano Alert Level to Warning.

Geologic Background. Bogoslof is the emergent summit of a submarine volcano that lies 40 km north of the main Aleutian arc. It rises 1500 m above the Bering Sea floor. Repeated construction and destruction of lava domes at different locations during historical time has greatly modified the appearance of this "Jack-in-the-Box" volcano and has introduced a confusing nomenclature applied during frequent visits of exploring expeditions. The present triangular-shaped, 0.75 x 2 km island consists of remnants of lava domes emplaced from 1796 to 1992. Castle Rock (Old Bogoslof) is a steep-sided pinnacle that is a remnant of a spine from the 1796 eruption. Fire Island (New Bogoslof), a small island located about 600 m NW of Bogoslof Island, is a remnant of a lava dome that was formed in 1883.

Source: US Geological Survey Alaska Volcano Observatory (AVO)