Report on Kizimen (Russia) — 8 June-14 June 2011
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 8 June-14 June 2011
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2011. Report on Kizimen (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 8 June-14 June 2011. Smithsonian Institution and US Geological Survey.
55.131°N, 160.32°E; summit elev. 2334 m
All times are local (unless otherwise noted)
KVERT reported that during 3-10 June seismicity from Kizimen was above background levels and strong tremor continued to be detected. Seismic data indicated that possible ash plumes rose to an altitude of 6.6 km (21,700 ft) a.s.l. during 5-8 June. Satellite images showed a large bright thermal anomaly on the volcano during 3-5, 7, and 9 June, and an ash plume that rose to an altitude of 5 km (16,400 ft) a.s.l. on 9 June.
During 11-12 June seismicity significantly increased. Seismic data indicated 10 strong explosions and ash plumes that rose to altitudes of 4-5.9 km (13,120-19,350 ft) a.s.l. Satellite imagery showed a wide ash plume that drifted 135 km SE and a large bright thermal anomaly. The Aviation Color Code was raised to Red. On 12 June volcanic tremor magnitude decreased, then sharply decreased about 4 hours later. The next day ash plumes observed in satellite imagery drifted 760 km E at altitudes that did not exceed 5.9 km (19,350) a.s.l. A large bright thermal anomaly continued to be detected. Volcanic-tremor magnitude again increased for about a three-hour period, then decreased and remained low on 14 June. Satellite imagery from that day showed a large pyroclastic flow deposit on the NE flank from 11-13 June activity. An ash plume drifted 26 km S on 15 June.
Geologic Background. Kizimen is an isolated, conical stratovolcano that is morphologically similar to St. Helens prior to its 1980 eruption. The summit consists of overlapping lava domes, and blocky lava flows descend the flanks of the volcano, which is the westernmost of a volcanic chain north of Kronotsky volcano. The 2334-m-high edifice was formed during four eruptive cycles beginning about 12,000 years ago and lasting 2000-3500 years. The largest eruptions took place about 10,000 and 8300-8400 years ago, and three periods of long-term lava dome growth have occurred. The latest eruptive cycle began about 3000 years ago with a large explosion and was followed by intermittent lava dome growth lasting about 1000 years. An explosive eruption about 1100 years ago produced a lateral blast and created a 1.0 x 0.7 km wide crater breached to the NE, inside which a small lava dome (the fourth at Kizimen) has grown. Prior to 2010, only a single explosive eruption, during 1927-28, had been recorded in historical time.