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Report on Zavaritzki Caldera (Russia) — December 1981

Zavaritzki Caldera

Scientific Event Alert Network Bulletin, vol. 6, no. 12 (December 1981)
Managing Editor: Lindsay McClelland.

Zavaritzki Caldera (Russia) No fumarolic activity

Please cite this report as:

Global Volcanism Program, 1981. Report on Zavaritzki Caldera (Russia) (McClelland, L., ed.). Scientific Event Alert Network Bulletin, 6:12. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198112-290180

Zavaritzki Caldera


46.9178°N, 151.9518°E; summit elev. 612 m

All times are local (unless otherwise noted)

No apparent fumarolic or solfataric activity was observed [during an aerial inspection of Kuril Island volcanoes on 20 September 1981].

Geological Summary. The Zavaritzki volcano on Simushir Island in the central Kuril Islands contains three nested calderas 10, 8, and 3 km in diameter. The steep-walled youngest caldera was formed during the Holocene and includes several young cones and lava domes near the margins of Biryuzovoe Lake. The current lake surface is at ~40 m elevation with the bottom ~30 m below sea level, but lacustrine sediments overlying pumice deposits indicate that the surface of an earlier caldera lake lay at 200 m above sea level. A small 500-m-diameter scoria cone, sketched by Gorshkov (1958, CAVW) that reportedly grew between 1916 and 1931, formed a peninsula extending into the lake from the NE caldera wall. Explosive eruptions in 1957 removed the cone and filled much of the NW part of the lake, including emplacement of a 350-m-wide, 40-m-high dome.

Information Contacts: G. Steinberg, Sakhalin Complex Institute.