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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.
NOTE: The information regarding Volcano on this page is re-published from other sources. No claims are made regarding the accuracy of Volcano information contained here. All suggestions for corrections of any errors about Volcano photos should be addressed to the copyright owner noted below the photo.
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This page was last modified 23-FEB-10
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