Report on Klyuchevskoy (Russia) — January 1990
Bulletin of the Global Volcanism Network, vol. 15, no. 1 (January 1990)
Managing Editor: Lindsay McClelland.
Klyuchevskoy (Russia) Strong summit explosions cause ashfalls 375 km away; SE flank lava fountains feed lava flow
Please cite this report as:
Global Volcanism Program, 1990. Report on Klyuchevskoy (Russia) (McClelland, L., ed.). Bulletin of the Global Volcanism Network, 15:1. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199001-300260.
56.056°N, 160.642°E; summit elev. 4754 m
All times are local (unless otherwise noted)
Explosive activity from summit and flank vents emitted ash and lava October-December 1989 and January 1990. Up to 5 ejections/minute from three vents in the summit crater sent ash to 2 km above the summit in December, with a visible plume stretching 20 km from the volcano. Lava fountaining, 30-50 m high from SE flank vents at 4100-4200 m altitude, fed two lava flows that moved SE and E to 2,500 m altitude. Violent explosive activity from the summit crater resumed 29 January, ejecting a 6-km ash plume that extended 60 km from the volcano [see also 15:3]. An incandescent cloud 600-1,500 m high pulsated at the base of the plume, which generated lightning at its top. Ashfall on the Bering Islands (~375 km SE of the volcano) was reported 1 February. Activity also occurred from a SE-flank crater.
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: B. Ivanov and E. Zhdanova, IV.