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Report on Bezymianny (Russia) — January 1985

Scientific Event Alert Network Bulletin, vol. 10, no. 1 (January 1985)
Managing Editor: Lindsay McClelland.

Bezymianny (Russia) Moderate gas and ash emission

Please cite this report as:

Global Volcanism Program, 1985. Report on Bezymianny (Russia). In: McClelland, L (ed.), Scientific Event Alert Network Bulletin, 10:1. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198501-300250.

Volcano Profile |  Complete Bulletin


Bezymianny

Russia

55.972°N, 160.595°E; summit elev. 2882 m

All times are local (unless otherwise noted)


Since the strong explosions in early October, moderate gas and ash emission has continued.

Further Reference. Malyshev, A.I., 1987, Bezymianny volcano: its eruption in 1981-1984: Volcanology and Seismology, no. 2, p. 89-93.

Geologic Background. Prior to its noted 1955-56 eruption, Bezymianny had been considered extinct. The modern volcano, much smaller in size than its massive neighbors Kamen and Kliuchevskoi, was formed about 4700 years ago over a late-Pleistocene lava-dome complex and an ancestral edifice built about 11,000-7000 years ago. Three periods of intensified activity have occurred during the past 3000 years. The latest period, which was preceded by a 1000-year quiescence, began with the dramatic 1955-56 eruption. This eruption, similar to that of St. Helens in 1980, produced a large horseshoe-shaped crater that was formed by collapse of the summit and an associated lateral blast. Subsequent episodic but ongoing lava-dome growth, accompanied by intermittent explosive activity and pyroclastic flows, has largely filled the 1956 crater.

Information Contacts: B. Ivanov, IVP.