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Report on Tomariyama [Golovnin] (Japan - administered by Russia) — April 1987

Tomariyama [Golovnin]

Scientific Event Alert Network Bulletin, vol. 12, no. 4 (April 1987)
Managing Editor: Lindsay McClelland.

Tomariyama [Golovnin] (Japan - administered by Russia) Moderate fumarolic and solfataric activity

Please cite this report as:

Global Volcanism Program, 1987. Report on Tomariyama [Golovnin] (Japan - administered by Russia) (McClelland, L., ed.). Scientific Event Alert Network Bulletin, 12:4. Smithsonian Institution. https://doi.org/10.5479/si.GVP.SEAN198704-290010

Tomariyama [Golovnin]

Japan - administered by Russia

43.844°N, 145.504°E; summit elev. 535 m

All times are local (unless otherwise noted)

During a 6 November aerial survey, moderate fumarolic and solfataric activity was noted at the N foot of the E and W domes and along Goryachee Lake's S shore.

Geological Summary. Tomariyama, also known as Golovnin, forms the southern end of Kunashir Island, across the Nemuro Strait from Hokkaido. Explosive activity has dominated in the formation of this andesitic-dacitic volcano; no lava flows are exposed. The gently sloping stratovolcano is truncated by a 4-5 km caldera that formed during a series of late-Pleistocene eruptions beginning about 43,000 years ago. Several lava domes were subsequently emplaced on the caldera floor. Topographic highs outside the caldera rim are lava domes extruded along a ring structure or an outer caldera. A 1 x 2.5 km caldera lake on the northern side of the inner caldera drains through a narrow breach in the western caldera wall. Solfataric activity occurs at the northern lake shore and at explosion craters (one of which contains a hot crater lake with reported temperatures from 36-100°C) that cut the caldera-floor lava domes. The only known recorded eruption was a minor explosion in 1848.

Information Contacts: G. Steinberg and B. Piskunov, Yuzhno-Sakhalinsk.