Report on Karymsky (Russia) — 18 April-24 April 2007
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 18 April-24 April 2007
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2007. Report on Karymsky (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 18 April-24 April 2007. Smithsonian Institution and US Geological Survey.
54.049°N, 159.443°E; summit elev. 1513 m
All times are local (unless otherwise noted)
Seismic activity at Karymsky was above background levels during 13-20 April. Ash plumes from explosions occurred during 13-20 April and may have reached altitudes of 4 km (13,000 ft) a.s.l. during 15-16 April and drifted E. Based on visual observation, a gas-and-steam plume rose to an altitude of 2.5 km (8,200 ft) a.s.l. on 19 April and a possible new lava flow was seen on the SW flank. A thermal anomaly in the crater was detected on satellite imagery during 14-16 April. Based on pilot reports, satellite imagery, and observations in the Petropavlovsk-Kamchatsky Flight Information Region (FIR), the Tokyo VAAC reported that an ash plume rose to an altitude of 7.6 (25,000 ft) a.s.l. and drifted SE. The Level of Concern Color Code remained at Orange.
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.