Report on Karymsky (Russia) — 7 April-13 April 2004
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 7 April-13 April 2004
Managing Editor: Gari Mayberry
Please cite this report as:
Global Volcanism Program, 2004. Report on Karymsky (Russia). In: Mayberry, G (ed.), Weekly Volcanic Activity Report, 7 April-13 April 2004. Smithsonian Institution and US Geological Survey.
54.049°N, 159.443°E; summit elev. 1513 m
All times are local (unless otherwise noted)
During 2-9 April seismicity was above background levels at Karymsky, with 270-400 shallow earthquakes occurring daily. Based on interpretations of seismic data, daily ash-and-gas explosions may have produced plumes to heights of 2.5-3 km a.s.l. During 6-7 April, ash plumes extended 15-40 km to the NE and N. On 7 April, ash deposits were noted on the volcano to the NNE, SSW, E, and W. Karymsky remained at Concern Color Code 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.