Report on Klyuchevskoy (Russia) — May 1983
Scientific Event Alert Network Bulletin, vol. 8, no. 5 (May 1983)
Managing Editor: Lindsay McClelland.
Klyuchevskoy (Russia) Numerous flank lava flows; weak summit explosions
Please cite this report as:
Global Volcanism Program, 1983. Report on Klyuchevskoy (Russia). In: McClelland, L. (ed.), Scientific Event Alert Network Bulletin, 8:5. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198305-300260.
56.056°N, 160.642°E; summit elev. 4754 m
All times are local (unless otherwise noted)
The NE flank eruption was continuing in early June. As many as 15 lava flows were simultaneously active, some reaching 5 km in length. At the end of May, the maximum discharge rate was 10 m3 per second. Weak explosions occurred from the summit crater. The activity was not visible on NOAA weather satellite imagery returned in May.
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: G. Bogoyavlenskaya, IVP; M. Matson, NOAA.