Report on Klyuchevskoy (Russia) — 10 February-16 February 2021
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 10 February-16 February 2021
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2021. Report on Klyuchevskoy (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 10 February-16 February 2021. 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 activity at Klyuchevskoy notably decreased, with the eruption likely ending on 8 February. The temperature of the thermal anomaly identified in satellite images abruptly dropped on 7 February, and the magnitude of volcanic tremor decreased during 7-8 February and continued to decline through 12 February. Strombolian activity was not visible at night during 11-12 February. The Aviation Color Code was lowered to Yellow (the second lowest level on a four-color scale) on 12 February.
The Tokyo VAAC reported that re-suspended ash was identified in satellite images during 12-13 February. On 15 February an ash plume rose to 5.2 km (17,000 ft) a.s.l. and drifted NE.
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.