Report on Karymsky (Russia) — February 1998
Bulletin of the Global Volcanism Network, vol. 23, no. 2 (February 1998)
Managing Editor: Richard Wunderman.
Karymsky (Russia) Ongoing gas-and-ash explosions
Please cite this report as:
Global Volcanism Program, 1998. Report on Karymsky (Russia). In: Wunderman, R. (ed.), Bulletin of the Global Volcanism Network, 23:2. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN199802-300130.
54.049°N, 159.443°E; summit elev. 1513 m
All times are local (unless otherwise noted)
Seismicity remained above background level and low-level Strombolian activity sent ash and steam 300-400 m above the crater during 27 January-1 March. During 27 January-8 February, gas-and-ash explosions occurred every 30-40 minutes. During 9 February-1 March, 70-100 gas-and-ash explosions occurred per day. On 9 February, 11 tectonic earthquakes were recorded ~10 km S of Karymsky.
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: Vladimir Kirianov, Kamchatka Volcanic Eruptions Response Team (KVERT), Institute of Volcanic Geology and Geochemistry; Tom Miller, Alaska Volcano Observatory.