Tomariyama [Golovnin]

sopka – Caldera, Japan - administered by Russia, Northwestern Pacific Volcanic Regions

Kde

Japan - administered by Russia, Northwestern Pacific Volcanic Regions

Typ (GVP)

Caldera

Nadmořská výška

535 m

Tektonické prostředí

Subduction zone / Intermediate crust (15-25 km)

Poslední známá erupce

1848

Poloha

43,844°, 145,504°

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.

Text: Smithsonian Global Volcanism Program.

Údaje o sopce: Smithsonian Global Volcanism Program. Další sopky a průduchy.