Report on Klyuchevskoy (Russia) — 5 June-11 June 2002
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 5 June-11 June 2002
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2002. Report on Klyuchevskoy (Russia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 5 June-11 June 2002. Smithsonian Institution and US Geological Survey.
56.056°N, 160.642°E; summit elev. 4754 m
All times are local (unless otherwise noted)
During most of the week of 31 May-7 June seismicity was above background levels at Kliuchevskoi, and continuous spasmodic tremor was registered. On 31 May a series of earthquakes less than or equal to ML (local magnitude) 2.3 were registered in the volcano's edifice, and about 20 ~30-km-deep earthquakes occurred per day under the volcano. On 5 June at 1820 volcanic tremor began to gradually diminish and by the end of the week shallow seismic activity had decreased. Low-level gas-and-steam plumes rose above the crater and no thermal anomalies or plumes were observed on satellite imagery. Kliuchevskoi remained at Concern Color Code Yellow ("volcano is restless").
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.