Report on Akan (Japan) — 15 March-21 March 2006
Smithsonian / US Geological Survey Weekly Volcanic Activity Report, 15 March-21 March 2006
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2006. Report on Akan (Japan). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 15 March-21 March 2006. Smithsonian Institution and US Geological Survey.
43.384°N, 144.013°E; summit elev. 1499 m
All times are local (unless otherwise noted)
A very small eruption occurred at Me-Akan (also called Meakan-dake, which means Meakan Peak) of the Akan volcanic complex on 21 March. Tremor began around 0628, the eruption apparently began around 0637, and an alert was issued by JMA at 0643. The eruption occurred from the volcano's NE flank. Ash was deposited on snow as far as 10 km SE of the volcano. The volcano is in a remote area and no populated areas were threatened. Me-Akan last erupted in 1998.
Geologic Background. Akan is a 13 x 24 km caldera located immediately SW of Kussharo caldera. The elongated, irregular outline of the 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 Oakandake was frequently active during the Holocene. The 1-km-wide Nakamachineshiri crater of Meakandake was formed during a major pumice-and-scoria eruption about 13,500 years ago. Within the Akan volcanic complex, only the Meakandake group, east of Lake Akan, has been historically active, producing mild phreatic eruptions since the beginning of the 19th century. Meakandake is composed of nine overlapping cones. The main cone of Meakandake proper has a triple crater at its summit. Historical eruptions at Meakandake have consisted of minor phreatic explosions, but four major magmatic eruptions including pyroclastic flows have occurred during the Holocene.
Sources: Gunma University, Reuters