Report on Bezymianny (Russia) — December 1994
Bulletin of the Global Volcanism Network, vol. 19, no. 12 (December 1994)
Managing Editor: Richard Wunderman.
Bezymianny (Russia) Small white steam plume; normal seismicity
Please cite this report as:
Global Volcanism Program, 1994. Report on Bezymianny (Russia) (Wunderman, R., ed.). Bulletin of the Global Volcanism Network, 19:12. Smithsonian Institution.
55.972°N, 160.595°E; summit elev. 2882 m
All times are local (unless otherwise noted)
During breaks in the cloudy weather during late October and November, observers in Kozirevsk (~50 km WNW) reported a white steam cloud reaching 50 m above crater on 27 October and 150 m on 18 November that was directed SE. On 24-28 November, observers in Kozirevsk noted weak fumarolic activity above the summit dome. Seismicity remained normal throughout November and early December. No information was available for the second half of December because of the suspension of communications from KVERT.
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: V. Kirianov, IVGG; AVO.