Report on Karymsky (Russia) — April 1985
Scientific Event Alert Network Bulletin, vol. 10, no. 4 (April 1985)
Managing Editor: Lindsay McClelland.
Karymsky (Russia) Apparent new lava flow photographed by astronauts
Please cite this report as:
Global Volcanism Program, 1985. Report on Karymsky (Russia). In: McClelland, L. (ed.), Scientific Event Alert Network Bulletin, 10:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198504-300130.
54.049°N, 159.443°E; summit elev. 1513 m
All times are local (unless otherwise noted)
On 3 May, Space Shuttle astronauts photographed a feature that appeared to be a short, stubby lava flow extending from the summit crater toward the Pacific coast. The feature was a black area with a length (roughly several hundred meters) 2-3 times its width, and boundaries that were sharply defined against the snow cover. No eruption plume was observed.
Geologic Background. Karymsky, the most active volcano of Kamchatka's eastern volcanic zone, is a symmetrical stratovolcano constructed within a 5-km-wide caldera that formed during the early Holocene. The caldera cuts the south side of the Pleistocene Dvor volcano and is located outside the north margin of the large mid-Pleistocene Polovinka caldera, which contains the smaller Akademia Nauk and Odnoboky calderas. Most seismicity preceding Karymsky eruptions originated beneath Akademia Nauk caldera, located immediately south. The caldera enclosing Karymsky formed about 7600-7700 radiocarbon years ago; construction of the stratovolcano began about 2000 years later. The latest eruptive period began about 500 years ago, following a 2300-year quiescence. Much of the cone is mantled by lava flows less than 200 years old. Historical eruptions have been vulcanian or vulcanian-strombolian with moderate explosive activity and occasional lava flows from the summit crater.
Information Contacts: C. Wood, NASA, Houston.