|Elevation||1,370.4 m (4,496 ft)|
|Listing||List of mountains and hills of Japan by height|
|Parent range||Akan Volcanic Complex|
|Topo map||Geographical Survey Institute 25000:1 雄阿寒岳
|Age of rock||Late Pleistocene-Holocene|
|Mountain type||Composite volcano, Lava dome|
|Volcanic arc/belt||Kuril arc|
Geography and geology
Mount Oakan sits in the Akan caldera northeast of Lake Akan. The volcano rises some 900 metres (3,000 ft) above the surrounding terrain. The top of the volcano is 1,370 metres (4,490 ft) above sea level. The volcanic cone is some 8 kilometres (5.0 mi) in diameter. There are three explosion craters at the summit. At Kitanakahara (北中腹?) at about 800 metres (2,600 ft), there is a fumarole. The volcano is made mostly from non-alkalai mafic volcanic rock. The main rock type is andesite and dacite.
Mount Oakan emerged in the Late Pleistocene dropping pumice on Minamishikata. After that, continuous lava flows formed the bulk of the volcano. In the final stages of its life, a parasitic volcano formed a lava dome at the summit.
- Saitō, Hiroshi (1996). 雄阿寒岳火山. 新版 地学事典 (in Japanese). 平凡社. Retrieved 2008-10-10.
- Hunt, Paul (1988). "32: Climbing an Active Volcano: Meakan-dake (雌阿寒岳)". Hiking in Japan: An Adventurer's Guide to the Mountain Trails (First ed.). Tokyo and New York: Kodansha International. pp. 195–200. ISBN 0-87011-893-5.