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Akan Volcano, Japan
The Me-Akan volcano group, east of lake Akan, is the only site of historical activity in Akan caldera.
Me-Akan (center) is seen here with the symmetrical Akan-Fuji volcano to the right.
They are part of a group of stratovolcanoes constructed within the 13 x 24 km, elongated Akan caldera, which formed more than 31,500 years ago immediately SW of Kutcharo caldera.
The Me-Akan group has produced mild phreatic eruptions since the beginning of the 19th century, including two days before this November 23, 1996 photo.
Akan is a 13 x 24 km caldera located immediately SW of Kutcharo caldera.
The elongated, irregular outline of the Akan caldera rim reflects its incremental formation during major explosive eruptions from the early to mid-Pleistocene.
Growth of four post-caldera stratovolcanoes, three at the SW end of the caldera and the other at the NE side, has restricted the size of the caldera lake.
Conical O-Akan volcano was frequently active during the Holocene.
The 1-km-wide Nakamachineshiri crater of Me-Akan volcano was formed during a major pumice-and-scoria eruption about 13,500 years ago.
Of the Holocene volcanoes of the Akan volcanic complex, only the Me-Akan group, east of Lake Akan, has been historically active, producing mild phreatic eruptions since the beginning of the 19th century.
Me-Akan is composed of 9 overlapping cones.
The main cone of Me-Akan proper has a triple crater at its summit.
Historical eruptions at Me-Akan have consisted of minor phreatic explosions, but four major magmatic eruptions including pyroclastic flows have occurred during the Holocene.
PHOTO SOURCE: Tom Pierson, 1989 (U.S. Geological Survey), courtesy of the Global Volcanism Program, Smithsonian National Museum of Natural History, used with permission.
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