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Country: | Japan | |
| Subregion Name: | Hokkaido (Japan) | ||
| Volcano Number: | 0805-07= | ||
| Volcano Type: | Caldera | ||
| Volcano Status: | Historical | ||
| Last Known Eruption: | 2008 | ||
| Summit Elevation: | 1499 m | 4,918 feet | |
| Latitude: | 43.384°N | 43°23'3"N | |
| Longitude: | 144.013°E | 144°0'46"E | |
| 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. The 1-km-wide Nakamachineshiri crater 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. | |||
