Report on Klyuchevskoy (Russia) — 21 February-27 February 2007
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 21 February-27 February 2007
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2007. Report on Klyuchevskoy (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 21 February-27 February 2007. Smithsonian Institution and US Geological Survey.
56.056°N, 160.642°E; summit elev. 4754 m
All times are local (unless otherwise noted)
Seismic activity at Kliuchevskoi continued at above background levels during 16-22 February. Based on observation and video data, gas-and-steam plumes rose to an altitude of 5.3 km (17,400 ft) a.s.l. and drifted E. These plumes possibly contained some ash. A thermal anomaly at the summit was seen on satellite imagery during 16-19 and 21 February. Based on information from KEMSD and satellite imagery, the Tokyo VAAC reported that eruption plumes possibly reached altitudes of 6.1 km (20,000 ft) a.s.l. and drifted E during 22-23 February.
According to a news article, ash particles up to 2 mm in diameter fell on the village of Klyuchi, about 40 km N on 26 February.
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.