Report on Karymsky (Russia) — 28 April-4 May 2010
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
28 April-4 May 2010
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2010. Report on Karymsky (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 28 April-4 May 2010. 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 23-30 April seismic activity from Karymsky was above background levels, suggesting that possible ash plumes rose to an altitude of 3 km (10,000 ft) a.s.l. Volcanologists working in the area on 20 and 21 April saw gas-and-steam plumes containing some ash rise to an altitude of 3 km (10,000 ft) a.s.l. At night, Strombolian activity was occasionally observed. Satellite imagery revealed a daily thermal anomaly over the volcano. The Aviation Color Code level 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.