Shikotsu

sopka – Caldera, Japan, Northwestern Pacific Volcanic Regions

Kde

Japan, Northwestern Pacific Volcanic Regions

Typ (GVP)

Caldera

Nadmořská výška

1 320 m

Tektonické prostředí

Subduction zone / Continental crust (> 25 km)

Poslední známá erupce

1981

Poloha

42,688°, 141,380°

The 13 x 15 km Shikotsu caldera, largely filled by the waters of Lake Shikotsu, was formed during one of Hokkaido's largest Quaternary eruptions about 31-34,000 years ago. The small andesitic Tarumaesan stratovolcano was then constructed on its SE rim and has been frequently active over the past 300 years. Pyroclastic-flow deposits from Tarumaesan extend nearly to the Pacific coast. Two other Holocene post-caldera volcanoes, Fuppushidake (adjacent to Tarumaesan) and Eniwadake (on the opposite side of the caldera), occur on a line trending NW from Tarumaesan, and were constructed just inside the caldera rim. Minor eruptions took place from the summit of Eniwadake as late as the 17th century. The summit of Tarumaesan contains a small 1.5-km-wide crater formed during eruptions in 1667 and 1739. Tarumaesan is now capped by a flat-topped summit lava dome that formed in 1909.

Text: Smithsonian Global Volcanism Program.

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