Akan Volcanic Complex

Akan Volcanic Complex
Akan Volcanic Complex
	Mount Meakan, Akan-Fuji and Mount Oakan on a satellite image of Eastern Hokkaido
Highest point
Peak	Mount Meakan
Elevation	1,499 m (4,918 ft)
Coordinates	43°23′11″N 144°00′32″E / 43.38639°N 144.00889°E
Naming
Native name	阿寒岳 (Japanese); Akan-dake (Japanese);
Geography
	Akan Volcanic Complex Akan Volcanic Complex
Country	Japan
State	Hokkaidō
Subprefectures	Kushiro and Tokachi
Districts	Ashoro District and Shiranuka District
Municipalities	Ashoro, Kushiro and Shiranuka
Geology
Orogeny	island arc
Rock type	Volcanic
Last eruption	November 2008

Mount Meakan and Akan Fuji from Mount Oakan (July 2008).

Akan Volcanic Complex is a volcanic group of volcanoes that grew out of the Akan caldera.^[1] 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 (a.k.a. Akan-ko^[2]), which fills a 24×13 km caldera,^[3] the tallest being Me-Akan (Meakan), O-Akan (Oakan) and Akan-Fuji.^[1]

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^[4] (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.^[5] The last eruption of this historical volcano was in 2008.^[3]

Oakan, Meakan, Furebetsu and Fuppushi are the major post-caldera volcanoes of the Akan volcanic complex.^[1]

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.^[4]

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.^[6]

Following are prominent features of Akan:^[7]

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^{[citation needed]}
Mount Ahoro^{[citation needed]}

References

^ ^a ^b ^c "AKAN Caldera". Quaternary Volcanoes of Japan, Geological Survey of Japan, AIST, 2006. Archived from the original on 2012-12-19. Retrieved 2011-03-09.
^ "Akan-ko: Japan". Geographical Names. Retrieved 2011-03-09.
^ ^a ^b "Akan". Global Volcanism Program. Smithsonian Institution. Retrieved 2021-06-25.
^ ^a ^b "Akan Volcanic Complex, Japan". Volcano Photos. Retrieved 2011-03-09.
^ "MEAKAN-DAKE". Quaternary Volcanoes of Japan, Geological Survey of Japan, AIST, 2006. Archived from the original on 2012-12-19. Retrieved 2011-03-09.
^ "Large Volcano Explocivity Index". Countries of the World. Retrieved 2011-03-09.
^ "Akan: Synonyms & Subfeatures". Global Volcanism Program. Smithsonian Institution. Retrieved 2021-06-25.

External links

Akan Caldera - Geological Survey of Japan

[AIST218b-1] "AKAN Caldera". Quaternary Volcanoes of Japan, Geological Survey of Japan, AIST, 2006. Archived from the original on 2012-12-19. Retrieved 2011-03-09.

[Names-2] "Akan-ko: Japan". Geographical Names. Retrieved 2011-03-09.

[SI-3] "Akan". Global Volcanism Program. Smithsonian Institution. Retrieved 2021-06-25.

[volcanoes-4] "Akan Volcanic Complex, Japan". Volcano Photos. Retrieved 2011-03-09.

[AIST218f-5] "MEAKAN-DAKE". Quaternary Volcanoes of Japan, Geological Survey of Japan, AIST, 2006. Archived from the original on 2012-12-19. Retrieved 2011-03-09.

[6] "Large Volcano Explocivity Index". Countries of the World. Retrieved 2011-03-09.

[vs-7] "Akan: Synonyms & Subfeatures". Global Volcanism Program. Smithsonian Institution. Retrieved 2021-06-25.

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