Report on Klyuchevskoy (Russia) — 7 January-13 January 2015
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 7 January-13 January 2015
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2015. Report on Klyuchevskoy (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 7 January-13 January 2015. 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 a Strombolian eruption began at Klyuchevskoy on 1 January; bombs were ejected 300-400 m above the crater. On 10 January strong gas-and-steam emissions containing ash were recorded by the webcam. Video images also indicated a possible lava flow on the S flank. The Aviation Color Code was raised to Orange. Strombolian and Vulcanian activity continued during 11-12 January, and explosions generated ash plumes that rose 5-7 km (16,400-23,000 ft) a.s.l. Satellite images on 11 January showed a 12.5-km-wide, 36.8-km-long ash plume drifting at an altitude of 5 km (16,400 ft) a.s.l. On 12 January an ash plume rose to an altitude of 5.5 km (18,000 ft) a.s.l. and drifted 35 km.
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.