Report on Klyuchevskoy (Russia) — April 1991
Bulletin of the Global Volcanism Network, vol. 16, no. 4 (April 1991)
Managing Editor: Lindsay McClelland.
Klyuchevskoy (Russia) Small summit plume; ash on SE flank
Please cite this report as:
Global Volcanism Program, 1991. Report on Klyuchevskoy (Russia). In: McClelland, L. (ed.), Bulletin of the Global Volcanism Network, 16:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199104-300260.
56.056°N, 160.642°E; summit elev. 4754 m
All times are local (unless otherwise noted)
A Space Shuttle photograph on 29 April at 1248 shows a plume, apparently containing ash, rising about 1 km above the summit and extending about 15 km downwind. Snow on the SE flank appeared to be ash-covered. A small summit eruption occurred on 8 April, but no additional eruptive activity has been reported.
Geologic Background. Klyuchevskoy (also spelled Kliuchevskoi) is Kamchatka's highest and most active volcano. Since its origin about 6000 years ago, the beautifully symmetrical, 4835-m-high basaltic stratovolcano has produced frequent moderate-volume explosive and effusive eruptions without major periods of inactivity. It rises above a saddle NE of sharp-peaked Kamen volcano and lies SE of the broad Ushkovsky massif. More than 100 flank eruptions have occurred during the past roughly 3000 years, with most lateral craters and cones occurring along radial fissures between the unconfined NE-to-SE flanks of the conical volcano between 500 m and 3600 m elevation. The morphology of the 700-m-wide summit crater has been frequently modified by historical eruptions, which have been recorded since the late-17th century. Historical eruptions have originated primarily from the summit crater, but have also included numerous major explosive and effusive eruptions from flank craters.
Information Contacts: C. Evans, Lockheed, Houston.