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Akan Volcanic Complex

Volcanic complex that grew out of the Akan caldera

Field	Value
name	Akan Volcanic Complex
native_name
last_eruption	November 2008
photo	akan_volcano_meakan-dake_hokkaido_japan_space_shot.jpg
photo_caption	Mount Meakan, Akan-Fuji and Mount Oakan on a satellite image of Eastern Hokkaido
country	Japan
subdivision1	Hokkaidō
subdivision2_type	Subprefectures
subdivision2
subdivision3_type	Districts
subdivision3
settlement_type	Municipalities
settlement
highest	Mount Meakan
elevation_m	1499
coordinates
geology	Volcanic
orogeny	island arc
map	Japan#Japan Hokkaido

Akan Caldera<br />Me-Akan (bottom left)<br />O-Akan (center right)

Akan Volcanic Complex is a volcanic group of volcanoes that grew out of the Akan caldera. It is located within Akan National Park, about 50 km Northwest of Kushiro in eastern Hokkaidō, Japan.

Description

A number of peaks are arranged around the rim of Lake Akan ( Akan-ko), which fills a 24×13 km caldera, the tallest being Me-Akan (Meakan), O-Akan (Oakan) and Akan-Fuji.

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 (a.k.a. Fuppushi-dake, not to be confused with Mount Fuppushi, which is located in Southwestern Hokkaido).

Volcanology

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.

Akan is rated with a volcanic explosivity index of 4 on the Smithsonian VEI scale, the scale's fourth-highest score, based on the volcano's largest known eruption, around 7050 BC.

Following are prominent features of Akan:

Cones

Me-Akan-Dake (Mount Meakan) (1499 m) Stratovolcano
Akan Fuji (Akan-Fuji, Akan-Huji) (1476 m) Stratovolcano
Kita-Yama (1400 m) Cone
O-Akan-Dake (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

Craters

Nakamachineshiri (Nakamatineshiri) Crater
Ponmachineshiri (Ponmatinesiri) Crater

Thermal features

Akan-Kohan Thermal Feature

Other peaks

Mount Ken
Mount Ahoro

References

"AKAN Caldera". Quaternary Volcanoes of Japan, Geological Survey of Japan, AIST, 2006.
"Akan-ko: Japan". Geographical Names.
{{cite gvp
"Akan Volcanic Complex, Japan". Volcano Photos.
"MEAKAN-DAKE". Quaternary Volcanoes of Japan, Geological Survey of Japan, AIST, 2006.
"Large Volcano Explocivity Index". Countries of the World.
{{cite gvp

Info: Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

volcanoes-of-hokkaido volcanic-groups pleistocene-calderas calderas-of-hokkaido kushiro-subprefecture

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