霧島火山,えびの高原周辺における最近15,000年間の活動史

DOI Web Site 被引用文献2件
  • 田島 靖久
    日本工営(株)名古屋支店
  • 松尾 雄一
    鹿児島大学理学部地球環境科学科:(現)京都市都市計画局
  • 庄司 達弥
    鹿児島大学理学部地球環境科学科:(現)株式会社住化分析センター
  • 小林 哲夫
    鹿児島大学大学院理工学研究科(理学系)

書誌事項

タイトル別名
  • Eruptive History of Ebinokogen Volcanic Area of Kirishima Volcanoes for the Past 15,000 Years in Kyushu, Japan
  • キリシマ カザン,エビノコウゲン シュウヘン ニ オケル サイキン 15,000ネンカン ノ カツドウシ

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抄録

The Kirishima volcanoes located in southern Kyushu are comprised of more than 20 volcanic edifices. The volcanoes occupy an elliptical area of approximately 330km2 with the WNW-ESE direction. Among the different types of volcanic edifices, the typical ones are compound maars and lava flows in Ebinokogen. We studied the volcanic history of Ebinokogen by geological examination of tephra layers and lava flows. After the Karakunidake-Kobayashi plinian eruption, seven tephra were formed in this area. We determined the ages of those tephra and two lava flows. The magmatic eruptions, produced Tamakino B tephra, occurred after Karakunidake-Kobayashi tephra eruption. The first activity in Ebinokogen from about 9.0 cal ka BP generated Fudoike lava flow, and Fudoike-Tamakino A tephra erupted from Fudoike crater. Karakunidake north-Ebino D tephra was generated from the northwest flank of Karakunidake at 4.3 cal ka BP, with debris avalanche and lahars. Phreatic Fudoike-Ebino C tephra erupted from the Fudoike crater at 1.6 cal ka BP. Ioyama-Ebino B tephra eruption started from around the 16th to 17th century with lava flow. Phreatic Ioyama east-Ebino A tephra erupted from Ioyama east crater in 1768 AD. The Ebinokogen area is one of the active regions of Kirishima volcanoes explicated by geophysical observations. Our results indicate cyclical tephra depositions mainly produced by small magmatic and strong phreatic eruptions in this area after the Karakunidake-Kobayashi pyroclastic eruption. Furthermore, the vent locations were found to migrate with each eruption.

収録刊行物

  • 火山

    火山 59 (2), 55-75, 2014

    特定非営利活動法人 日本火山学会

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