Report on Kizimen (Russia) — 5 October-11 October 2011
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
5 October-11 October 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, 5 October-11 October 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 30 September-7 October video data showed that a large lava flow on Kizimen's NE flank continued to effuse. Strong fumarolic activity was observed during 29-30 September and 3-6 October. A thermal anomaly on the volcano was detected daily in satellite images but the temperature of the anomaly decreased during the end of the week. During 5-6 October the number of volcanic earthquakes decreased, from 1,300 to 500-700, as well as the magnitudes. The Aviation Color Code remained at Orange.
Geological Summary. 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.