Report on Karymsky (Russia) — April 1976
Natural Science Event Bulletin, vol. 1, no. 7 (April 1976)
Managing Editor: David Squires.
Karymsky (Russia) Frequent explosions eject tephra and gases
Please cite this report as:
Global Volcanism Program, 1976. Report on Karymsky (Russia). In: Squires, D. (ed.), Natural Science Event Bulletin, 1:7. Smithsonian Institution. https://doi.org/10.5479/si.GVP.NSEB197604-300130.
54.049°N, 159.443°E; summit elev. 1513 m
All times are local (unless otherwise noted)
Karymsky erupted during April. Scientists registered 60-80 explosions a day and believed that the plug in the crater's vent was being broken. Ash, slag, and gases were discharged from the crater.
Further Reference. Zharinov, I.A., and Firstov, P.P., 1985, Activity, seismic regime, and crust inclination at Karymsky volcano during the summer of 1976: Volcanology and Seismology, no. 2, p. 93-95.
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: Y. Doubik, IV.