Report on Sashiusudake [Baransky] (Japan - administered by Russia) — November 1988
Scientific Event Alert Network Bulletin, vol. 13, no. 11 (November 1988)
Managing Editor: Lindsay McClelland.
Sashiusudake [Baransky] (Japan - administered by Russia) Fumarolic activity
Please cite this report as:
Global Volcanism Program, 1988. Report on Sashiusudake [Baransky] (Japan - administered by Russia). In: McClelland, L (ed.), Scientific Event Alert Network Bulletin, 13:11. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198811-290080.
Japan - administered by Russia
45.1°N, 148.019°E; summit elev. 1125 m
All times are local (unless otherwise noted)
During an October visit to the crater, activity remained at previous levels. Fumaroles were concentrated in five groups with gas temperatures ranging from 98 to 108°C. Gas was released under pressure in four of the five groups, to 2-6 m height.
Geologic Background. The Sashiusudake (also known as Baransky) volcanic complex along the Pacific coast in the central part of Iturup Island consists of an eroded Pleistocene volcano that is capped by a Holocene stratovolcano. A young summit lava dome is cut by a NW-trending chain of small explosion craters. A group of flank cones farther to the NW with a similar NW-SE orientation is partially surrounded by lava flows from the central crater of the andesitic-dacitic volcano. Lava flows from descended 4-5 km SE to reach the Pacific Ocean along a broad front. The only historical eruption occurred in 1951, when local inhabitants reported weak explosive activity at the summit. Strong solfataric activity continues from the summit and several flank craters, and the SW flank geothermal field contains hot springs and geysers. A small hydrothermal explosion took place in 1992 at an exploratory well in the SW-flank geothermal field.
Information Contacts: G. Steinberg, Yuzhno-Sakhalinsk.