Report on Karymsky (Russia) — 14 November-20 November 2001
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 14 November-20 November 2001
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2001. Report on Karymsky (Russia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 14 November-20 November 2001. Smithsonian Institution and US Geological Survey.
54.049°N, 159.443°E; summit elev. 1513 m
All times are local (unless otherwise noted)
Increased seismicity at Karymsky during 11-16 November led KVERT to raise the Color Concern Code from Yellow to Orange. Beginning on 11 November seismicity was above background levels and many earthquakes and episodes of high-frequency spasmodic volcanic tremor were registered beneath the volcano. On 15 November at 0830 seismicity increased and earthquakes and signals of possible weak ash-and-gas explosions were registered. On 16 November at 0943 a 20-minute-long seismic signal was interpreted to indicate a gas-and-ash cloud may have risen to 8 km a.s.l.
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.