Report on Sarychev Peak (Russia) — 1 July-7 July 2009
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 1 July-7 July 2009
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2009. Report on Sarychev Peak (Russia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 1 July-7 July 2009. Smithsonian Institution and US Geological Survey.
48.092°N, 153.2°E; summit elev. 1496 m
All times are local (unless otherwise noted)
SVERT reported that an intense thermal anomaly from Sarychev Peak was detected on satellite imagery during 1-6 July. Gas-and-steam plumes were seen almost daily and drifted 20-75 km NW, NE, and SE. Plumes rose to altitudes of 1.5-3 km (4,900-10,000 ft) a.s.l. during 4-5 July. No large ash explosions were noted after 16 June.
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.