Report on Tao-Rusyr Caldera (Russia) — April 1987
Scientific Event Alert Network Bulletin, vol. 12, no. 4 (April 1987)
Managing Editor: Lindsay McClelland.
Tao-Rusyr Caldera (Russia) No fumarolic activity
Please cite this report as:
Global Volcanism Program, 1987. Report on Tao-Rusyr Caldera (Russia) (McClelland, L., ed.). Scientific Event Alert Network Bulletin, 12:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198704-290310.
49.35°N, 154.7°E; summit elev. 1325 m
All times are local (unless otherwise noted)
During an aerial survey on 2 November 1986 the summit crater [of Krenitzyn] was covered with snow. There was no indication of fumarolic activity in the summit area or in the area of the 1952 E-flank eruption.
Geologic Background. The 7.5-km-wide Tao-Rusyr caldera on southern Onekotan Island is one of the most impressive volcanoes of the Kuril Islands. The basaltic-to-andesitic caldera is filled by the deep-blue 7-km-wide Kal'tsevoe lake, whose surface is 400 m above sea level. The caldera was formed about 7500 years ago during one of the largest Holocene eruptions in the Kuril Islands. A large symmetrical post-caldera cone, 1325-m-high andesitic Krenitzyn Peak, forms a 4-km wide island that towers high above the caldera rim and fills the NW portion of the caldera lake. A 350-m-wide, 100-m-deep crater truncates the peak and a large lateral crater is located on the upper NE side. The only historical eruption of Krenitzyn Peak, in 1952, formed a small, mostly lacustral lava dome in an explosion crater along the east shore of the island.
Information Contacts: G. Steinberg and B. Piskunov, Yuzhno-Sakhalinsk.