Report on Karymsky (Russia) — 26 November-2 December 2008
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
26 November-2 December 2008
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2008. Report on Karymsky (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 26 November-2 December 2008. Smithsonian Institution and US Geological Survey.
54.049°N, 159.443°E; summit elev. 1513 m
All times are local (unless otherwise noted)
KVERT reported that seismic activity at Karymsky was at background levels during 21-23 and 26-28 November. Seismicity increased above background levels on 24 and 25 November; possible explosions may have generated ash plumes to an altitude of 3 km (10,000 ft) a.s.l. during 23-25 November. During an overflight, scientists observed gas-and-steam plumes that rose to altitudes of 2-2.4 km (6,600-7,900 ft) a.s.l. Analysis of satellite imagery revealed a thermal anomaly in the crater during 20, 22, and 24-26 November. The Level of Concern Color Code remained at Orange.
Geological Summary. 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.