Report on Klyuchevskoy (Russia) — 18 July-24 July 2007
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 18 July-24 July 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, 18 July-24 July 2007. Smithsonian Institution and US Geological Survey.
56.056°N, 160.642°E; summit elev. 4754 m
All times are local (unless otherwise noted)
KVERT reported that seismic activity at Kliuchevskoi was at background levels during 13-20 July. Based on observations of satellite imagery, ash plumes drifted E on 13 July and a thermal anomaly in the crater was noted during 13-20 July. Ash plumes rose to an altitude of 5.5 km (18,000 ft) a.s.l. and drifted SE and E during 13-15 July, according to video and visual observations. Gas-and-steam plumes were observed on 12, 16, and 18 July. The Level of Concern Color Code was lowered from Orange to Yellow due to a decrease in seismicity and an absence of ash plumes during 17-20 July.
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.