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.
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.