Report on Sarychev Peak (Russia) — 31 October-6 November 2018
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 31 October-6 November 2018
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2018. Report on Sarychev Peak (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 31 October-6 November 2018. Smithsonian Institution and US Geological Survey.
48.092°N, 153.2°E; summit elev. 1496 m
All times are local (unless otherwise noted)
KVERT reported that an ash explosion at Sarychev Peak was last noted on 10 October and a thermal anomaly was last identified on 15 October. The volcano was quiet or obscured by clouds during 16-31 October. KVERT lowered the Aviation Color Code to Yellow (the second lowest level on a four-color scale).
Geologic Background. Sarychev Peak, one of the most active volcanoes of the Kuril Islands, occupies the NW end of Matua Island in the central Kuriles. The andesitic central cone was constructed within a 3-3.5-km-wide caldera, whose rim is exposed only on the SW side. A dramatic 250-m-wide, very steep-walled crater with a jagged rim caps the volcano. The substantially higher SE rim forms the 1496 m high point of the island. Fresh-looking lava flows, prior to activity in 2009, had descended in all directions, often forming capes along the coast. Much of the lower-angle outer flanks of the volcano are overlain by pyroclastic-flow deposits. Eruptions have been recorded since the 1760s and include both quiet lava effusion and violent explosions. Large eruptions in 1946 and 2009 produced pyroclastic flows that reached the sea.