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Mashu volcano

caldera 855 m / 2,805 ft
Hokkaido, Japan, 43.51°N / 144.57°E
Current status: dormant (1 out of 5)
Mashu volcano books
Typical eruption style: explosive
Mashu volcano eruptions: 1080 ± 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)
TimeMag. / DepthDistanceLocation
Sat, 20 May
Sat, 20 May 13:28 UTCM 2.6 / 135.4 km14 kmTESHIKAGA REGION
Thu, 18 May
Thu, 18 May 22:08 UTCM 2.5 / 87.9 km40 kmNEMURO REGION
Mon, 1 May
Mon, 1 May 15:34 UTCM 2.8 / 130.6 km29 kmNEMURO REGION
Sat, 29 Apr
Sat, 29 Apr 08:01 UTCM 2.5 / 140.4 km29 kmKUSHIRO REGION
View all recent quakes
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.

Background:

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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