Report on Bezymianny (Russia) — July 1999
Bulletin of the Global Volcanism Network, vol. 24, no. 7 (July 1999)
Managing Editor: Richard Wunderman.
Bezymianny (Russia) Aseismic with largely minor steaming through 9 August
Please cite this report as:
Global Volcanism Program, 1999. Report on Bezymianny (Russia) (Wunderman, R., ed.). Bulletin of the Global Volcanism Network, 24:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199907-300250.
55.972°N, 160.595°E; summit elev. 2882 m
All times are local (unless otherwise noted)
From the period of 31 May 1999 thru 9 August 1999, no seismic activity was registered under the volcano. Fumarolic activity occurred periodically, with occasional plumes of gas-and-steam rising to a few hundred meters above the crater and extending several kilometers from the volcano.
On 18 June, a gas-and-steam plume rose 100 m above the crater, extending S more than 3 km, while a gas-and-steam plume on 28 June rose 400 m above the crater and extended fan-like 30 km to the E. Similar plumes occurred on 11, 13, 21, and 26 July, some rising as high as 300 m above the crater and extending up 10 km from the volcano.
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: Olga Chubarova, Kamchatka Volcanic Eruptions Response Team (KVERT), Institute of Volcanic Geology and Geochemistry, Piip Ave. 9, Petropavlovsk-Kamchatsky, 683006, Russia; Tom Miller, Alaska Volcano Observatory (AVO), a cooperative program of a) U.S. Geological Survey, 4200 University Drive, Anchorage, AK 99508-4667, USA (URL: http://www.avo.alaska.edu/), b) Geophysical Institute, University of Alaska, PO Box 757320, Fairbanks, AK 99775-7320, USA, and c) Alaska Division of Geological & Geophysical Surveys, 794 University Ave., Suite 200, Fairbanks, AK 99709, USA.