Report on Klyuchevskoy (Russia) — August 1993
Bulletin of the Global Volcanism Network, vol. 18, no. 8 (August 1993)
Managing Editor: Edward Venzke.
Klyuchevskoy (Russia) Gas-and-ash plume persists; lava flow stops
Please cite this report as:
Global Volcanism Program, 1993. Report on Klyuchevskoy (Russia). In: Venzke, E (ed.), Bulletin of the Global Volcanism Network, 18:8. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199308-300260.
56.056°N, 160.642°E; summit elev. 4754 m
All times are local (unless otherwise noted)
The summit eruption . . . continued, but the volcano was obscured by clouds 6-12 August. On 13 August, the gas-and-ash plume rose 200 m above the crater. By 20 August, lava had stopped flowing from the crater. That same day, the gas-and-ash plume reached a height of 500 m above the crater and extended ~2 km SE. Reports of a flank eruption were investigated on 8 September, but no new eruptive activity was found. On 9 September, the gas-and-ash plume rose 200 m above the crater and extended SE for ~15 km. Within the summit crater, eruptive outbursts occurred throughout the day. Seismicity decreased in early August, but increased again in early September, when constant volcanic tremor was registered.
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.
Information Contacts: V. Kirianov, IVGG.