Report on Klyuchevskoy (Russia) — 9 February-15 February 2011
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 9 February-15 February 2011
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2011. Report on Klyuchevskoy (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 9 February-15 February 2011. Smithsonian Institution and US Geological Survey.
56.056°N, 160.642°E; summit elev. 4754 m
All times are local (unless otherwise noted)
Although moderate seismic activity was recorded at Kliuchevskoi during 4-11 February, KVERT reported that seismicity had essentially decreased. Gas-and-steam activity was observed during 4-7 February; clouds prevented observations on later days. Gas-and-steam plumes drifted 20 km NE on 5 and 7 February. Satellite imagery showed a weak thermal anomaly over the crater on 6 and 7 February. The Aviation Color Code was lowered to Green.
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.