Akan Volcanic Complex
|Akan Volcanic Complex|
Mount Meakan, Akan-Fuji and Mount Oakan on a satellite image of Eastern Hokkaido
|Elevation||1,499 m (4,918 ft)|
|Native name||阿寒岳, Akan-dake|
|Regions||Kushiro Subprefecture and Tokachi Subprefecture|
|Districts||Ashoro District and Shiranuka District|
|Type of rock||Volcanic|
Oakan is prominently located at the Northeast side of the caldera, while Meakan occupies the opposite, Southwest side, in a cluster of nine stratovolcanoes that include Akan-Fuji, one of many symmetrical Japanese volcanoes named after the renowned Mount Fuji, and Fuppushi volcano (aka Fuppushi-dake, not to be confused with Mount Fuppushi, which is located in Southwestern Hokkaido).
The Akan caldera was formed 31,500 years ago. Its elongated shape is due to its incremental formation during major explosive eruptions, from the early to the mid-Pleistocene periods.
The Nakamachineshiri crater of Meakan volcano was formed during a major eruption about 13,500 years ago.
The Me-Akan group of nine overlapping cones on the eastern side of Lake Akan has had mild eruptions since the beginning of the 19th century. The last eruption of this historical volcano was in 2008.
Oakan, Meakan, Furebetsu and Fuppushi are the major post-caldera volcanoes of the Akan volcanic complex.
Me-Akan is one of the most active volcanoes of Hokkaido. Its summit contains the active craters of Ponmachineshiri and Naka-Machineshiri, sites of frequent phreatic eruptions in historical time. Akan-Fuji and O-Akan have not erupted in historical time.
Following are prominent features of Akan:
- Mount Meakan (1499 m) Stratovolcano
- Akan Fuji (Akan-Fuji, aka Akan-Huji) (1476 m) Stratovolcano
- Kita-Yama (1400 m) Cone
- O-Akan (Mount Oakan) (1371 m) Stratovolcano
- Kenga-Mine Cone 1336 m
- Nishi-Yama (Nisi-Yama) (1300 m) Cone
- Fuppushi (Huppusi) (1226 m) Stratovolcano
- Miname-Dake (1217 m) Stratovolcano
- Higashi-Dake (Higasi-Dake) (1140 m) Cone
- Furebetsu (Hurebetu) (1098 m) Stratovolcano
- Kobu-Yama Cone
- Futatsu-Dake Pyroclastic cone
- Nakamachineshiri (Nakamatineshiri) Crater
- Ponmachineshiri (Ponmatinesiri) Crater
- Akan-Kohan Thermal Feature
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- "MEAKAN-DAKE". Quaternary Volcanoes of Japan, Geological Survey of Japan, AIST, 2006. Retrieved 2011-03-09.
- "Large Volcano Explocivity Index". Countries of the World. Retrieved 2011-03-09.
- OAKAN-DAKE, Quaternary Volcanoes of Japan, Geological Survey of Japan, AIST, 2006