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Mashu

Volcano
Mashu volcano is a 7 km wide caldera in NE Hokkaido, Japan. The caldera formed ca. 7000 years ago and truncates a stratovolcano which formed the ESE rim of the large Kutcharo caldera to the west. The steep-walled Mashu caldera contains Lake Mashu (摩周湖 Mashū-ko), known for its very clear water, and is one of the scenic highlights of Hokkaido.
Volcano typecaldera normal or dormant
LocationJapan
Summit elevation855 m / 2,805 ft
Mashu volcano eruptions1080 ± 100 years, 350 AD ± 100 years, 150 AD ± 100 years, 2050 BC ± 40 years, 2800 BC ± 1000 years, 3550 BC ± 40 years, 5550 BC ± 100 years (Plinian eruption, caldera formation) (radiocarbon dated)
Typical eruption styleexplosive
A small andesitic stratovolcano, Kamuinupuri, was constructed beginning about 4000 years ago in the SE part of of the deep caldera lake. The latest dated eruption of the volcano was a large explosive eruption about 1000 years ago, which created a 1.2 x 1.5 km crater at the summit of Kamuinupuri.

Kamuishu is a small island in the center of Lake Mashu. It is the tip of a mostly submerged dacitic lava dome.
 

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