Report on Klyuchevskoy (Russia) — 19 November-25 November 2008
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 19 November-25 November 2008
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2008. Report on Klyuchevskoy (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 19 November-25 November 2008. 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 above background levels during 14-21 November and Strombolian activity continued. Video and visual observations showed that during 13-17 November gas-and-steam plumes containing a small amount of ash rose to an altitude of 5.3 km (17,400 ft) a.s.l. On 17 November, "bursting" sounds from the volcano were heard in Klyuchi, about 30 km to the NE. Analysis of satellite imagery revealed a large daily thermal anomaly in the crater during 14-21 November. On 22 November a lava flow traveled 1.5-1.8 km down the NW flank. The Level of Concern Color Code remained Orange. [Correction: a lava flow traveled down the NW flank on 21 November.]
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.