Shikotsu VulkanShikotsu volcano is the large 15 x 13 km diameter caldera containing 360 m deep Lake Shikotsu (支笏湖 Shikotsu-ko), Japan's second largest crater lake and the northernmost lake which doesn't feeeze over in winter.
The small andesitic Tarumai (Tarumae, 樽前山 Tarumae-zan) stratovolcano sits on the SE rim of Shikotsu caldera and has been Hokkaido's most active volcano in historical time.
In the winter the Chitose-Shikotsuko-Hyobaku-Matsuri Festival (Ice Fall Festival) features sculptured made out of ice from lake water.
Beschreibung:The Shikotsu caldera was formed during one of Hokkaido's largest Quaternary eruptions about 31-34,000 years ago.
Pyroclastic-flow deposits from Tarumai extend almost to the Pacific coast. 2 other Holocene post-caldera volcanoes, Fuppushi (adjacent to Tarumai) and Eniwa (on the opposite side of the caldera), occur on a line trending NW from Tarumai, and were constructed just inside the caldera rim.
Minor eruptions took place from the summit of Eniwa volcano as late as the 17th century. The summit of Tarumai contains a small 1.5-km-wide caldera formed during 2 of Hokkaido's largest historical eruptions, in 1667 and 1739. Tarumai is now capped by a flat-topped summit lava dome that formed in 1909.