Report on Karymsky (Russia) — September 2000
Bulletin of the Global Volcanism Network, vol. 25, no. 9 (September 2000)
Managing Editor: Richard Wunderman.
Karymsky (Russia) Likely pyroclastic flow on 25 June; increase in seismic events and explosions
Please cite this report as:
Global Volcanism Program, 2000. Report on Karymsky (Russia). In: Wunderman, R. (ed.), Bulletin of the Global Volcanism Network, 25:9. Smithsonian Institution. https://doi.org/10.5479/si.GVP.BGVN200009-300130.
54.049°N, 159.443°E; summit elev. 1513 m
All times are local (unless otherwise noted)
This report covers Karymsky's activity from June through mid-October 2000. KVERT (Kamchatkan Volcanic Eruption Response Team) resumed reports at the beginning of June after a month-long shutdown due to funding deficiencies. The seismic events per day and number of explosions varied throughout the period, but decreased to background levels by the end of September. On 10 June, 25 short-lived weak explosions occurred, although the average number of explosions per day during that week remained low. During 19-29 June, seismicity increased when up to 17 events occurred per day. The number of weak explosions also increased during 19-29 June when up to six explosions occurred per day. On the afternoon of 25 June intense explosions were recorded that suggested a pyroclastic flow. Other than this, no significant volcanic activity occurred. KVERT maintained the Level of Concern Color Code at Green for the entire interval.
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: Olga Chubarova, Kamchatka Volcanic Eruptions Response Team (KVERT), Institute of Volcanic Geology and Geochemistry, Piip Ave. 9, Petropavlovsk-Kamchatsky, 683006, Russia; Tom Miller, Alaska Volcano Observatory (AVO), a cooperative program of a) U.S. Geological Survey, 4200 University Drive, Anchorage, AK 99508-4667, USA (URL: http://www.avo.alaska.edu/), b) Geophysical Institute, University of Alaska, PO Box 757320, Fairbanks, AK 99775-7320, USA, and c) Alaska Division of Geological & Geophysical Surveys, 794 University Ave., Suite 200, Fairbanks, AK 99709, USA.