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Mount Ōkueyama (大崩山), also known as Mount Ōkue, is a volcanic mountain on the Japanese island of Kyushu. Part of an ancient volcanic formation known as the Okueyama Volcano-plutonic Complex,[1] Mount Ōkueyama (and possibly several nearby volcanoes)[2] experienced a massive eruption ~13.7 million years before present (13.7 Ma); it has been postulated that this eruption measured 8.0 on the Volcanic Explosivity Index, making the Ōkueyama eruption larger than any eruption in recorded history.[2] The mountain is now considered to be extinct.[1]

Mount Ōkueyama
Highest point
Elevation1,643 m (5,390 ft)
Coordinates32°44′16″N 131°30′47″E
Geography
LocationKyushu, Japan
Geology
Mountain typestratovolcano
Last eruption~13.7 Ma

In 1990, the area around the mountain was designated a Forest Ecosystem Reserve,[3] and In 2017 Mount Ōkueyama was declared part of a UNESCO biosphere reserve, the Sobo, Katamuki and Okue Biosphere Reserve.[4][5]

The area is managed by the Forestry Agency of Japan.[3]


See also



References


  1. Takahashi, Masaki. Subsurface Structure of Miocene Large-scale Caldera Cluster: Illustrated Descriptions of Geology of the Okueyama Volcano-plutonic Complex, Southwest Japan. Received November 16, 2013 URL: https://www.chs.nihon-u.ac.jp/institute/nature/kiyou/2014/pdf/2_11.pdf
  2. Daisuke, Miura; Yutaka, Wada (2007). "Middle Miocene ash-flow calderas at the compressive margin of southwest Japan arc: Review and synthesis". The Journal of the Geological Society of Japan. 113 (7): 283–295. doi:10.5575/geosoc.113.283. Retrieved 8 August 2019.
  3. "Area around Mt. Sobosan, Mt. Katamukiyama, and Mt. Okueyama". Protected Planet. Retrieved 2019-08-07.
  4. "23 new sites added to UNESCO's World Network of Biosphere Reserves". UNESCO. 2017-06-14. Retrieved 2019-08-07.
  5. "Two sites in Japan to be added to UNESCO biosphere reserves". The Japan Times Online. 2017-06-14. ISSN 0447-5763. Retrieved 2019-08-07.


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