Beppu–Shimabara graben explained

The is a geological formation that runs across the middle of Kyushu, Japan, from Beppu Bay in the east to the Shimabara Peninsula in the west.[1] The area is known for its volcanic, geothermal, and seismic activity.[2] It encompasses several significant geological features, including a number of active volcanoes. The most prominent is Mount Aso, an active volcanic formation consisting of one of the world's largest calderas and a central crater group with five distinct peaks.[3] Beppu Onsen is located at the eastern end of the graben.

It is located at the overlap of two magma types—within plate type to the north, and island-arc type to the south—that erupted in the Quaternary: to the north, the eastern end of the Eurasian Plate and, to the south, the subduction zone of the Philippine Sea Plate.[4] It runs about 200 kilometres east to west and its north-south width varies between 20 and 30 kilometres.[5]

Notes and References

  1. Contemporaneous ascent of within-plate type and island-arc type magmas in the Beppu–Shimabara graben system, Kyushu island, Japan. Journal of Volcanology and Geothermal Research. November 2001. 111. 1–4. 99. 10.1016/s0377-0273(01)00222-0. Kita. Itsuro. Yamamoto. Masatsugu. Asakawa. Yoshitada. Nakagawa. Masafumi. Taguchi. Sachihiro. Hasegawa. Hidenao.
  2. Handa. Shun. Electrical conductivity structures estimated by thin sheet inversion, with special attention to the Beppu-Shimabara graben in central Kyushu, Japan. Earth Planets Space. 2005. 57 . 7. 605–612. 16 April 2016. The Society of Geomagnetism and Earth, Planetary and Space Sciences. 10.1186/BF03351839 . free .
  3. Web site: Description of Mt. Aso. Information on Restrictions for the Aso Volcano Crater. The Aso Volcano Disaster Prevention Council. 16 April 2016. 2008.
  4. Contemporaneous ascent of within-plate type and island-arc type magmas in the Beppu–Shimabara graben system, Kyushu island, Japan. Journal of Volcanology and Geothermal Research. November 2001. 111. 1–4. 99. 10.1016/s0377-0273(01)00222-0. Kita. Itsuro. Yamamoto. Masatsugu. Asakawa. Yoshitada. Nakagawa. Masafumi. Taguchi. Sachihiro. Hasegawa. Hidenao.
  5. Web site: Geothermal sciences within the "Beppu-Shimabara Graben". Institute for Geothermal Sciences (IGS). Institute for Geothermal Sciences Kyoto University. 16 April 2016.

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