Report on Karymsky (Russia) — 20 November-26 November 2002
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
20 November-26 November 2002
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2002. Report on Karymsky (Russia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 20 November-26 November 2002. Smithsonian Institution and US Geological Survey.
54.049°N, 159.443°E; summit elev. 1513 m
All times are local (unless otherwise noted)
Seismicity remained above background levels at Karymsky during 15-22 November, with 200-220 local shallow events recorded per day. The character of the seismicity indicated that ash-and-gas explosions rose to 1-2 km above the volcano and vigorous gas emissions lasting 5-10 minutes possibly occurred. On 20 November at 1157 a 20-minute-long seismic event was taken to indicate the possible occurrence of ash explosions up to 1 km above the crater and hot avalanches. Thermal anomalies (1-3 pixels) were visible on satellite imagery on several days. Karymsky remained at Concern Color Code Yellow.
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.