Report on Karymsky (Russia) — 24 August-30 August 2011
Smithsonian Institution / US Geological Survey
Weekly Volcanic Activity Report, 24 August-30 August 2011
Managing Editor: Sally Sennert.
Please cite this report as:
Global Volcanism Program, 2011. Report on Karymsky (Russia) (Sennert, S, ed.). Weekly Volcanic Activity Report, 24 August-30 August 2011. 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 during 19-26 August moderate seismic activity continued at Karymsky, indicating that possible ash plumes rose to an altitude of 5.2 km (17,000 ft) a.s.l. A thermal anomaly on the volcano was detected by satellite during 21-25 August. Gas-and-steam plumes containing ash drifted 18 and 65 km E on 18 and 24 August, respectively. The Aviation Color Code remained at Orange.
Based on information from Yelizovo Airport (UHPP), the Tokyo VAAC reported that on 29 August an ash plume rose to an altitude of 7.3 km (24,000 ft) a.s.l. and drifted E.
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.