An overview of Yake-dake from Kamikochi valley. All photographs courtesy of and copyrighted by Mike Lyvers.

Yake-dake is a stratovolcano with 26 historic eruptions. The oldest historic eruption was about 686 AD. There was a large eruption (at least VEI=3) in 1585. Yake-dake erupted 23 times between 1907 and 1939. The most recent eruption was in 1962-1963. Nearly all of Yake-dake's eruptions were phreatic. Eruptions are from central, flank, and fissure vents. Mudflows during the 1585, 1915, 1931, and 1962-1963 eruptions caused damage.

A close-up of the summit region.

Approaching the summit.

A complex of several craters at the summit of Yake-dake.

The most recently active crater at Yake-dake.

A panorama of the summit craters.

The "bottomless" active crater of Yake-dake, an extremely deep vent which drops off into blackness.

Kamikochi Valley, viewed from the summit.

Taisho Lake, created in an eruption which dammed the river draining the valley.

Source of Information:

Simkin, T., and Siebert, L., 1994, Volcanoes of the World: Geoscience Press, Tucson, Arizona, 349 p.

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