南九州,池田火山の噴火史(＜特集＞火山噴火史解明のための露頭データベース構築の検討)

DOI Web Site
  • 稲倉 寛仁
    西日本技術開発株式会社調査解析部
  • 成尾 英仁
    鹿児島県立武岡台高等学校
  • 奥野 充
    福岡大学理学部地球圏科学科:福岡大学産学官連携研究機関国際火山噴火史情報研究所
  • 小林 哲夫
    鹿児島大学大学院理工学研究科地球環境科学専攻

書誌事項

タイトル別名
  • Eruptive History of Ikeda Volcano, Ibusuki Area, Southern Kyushu, Japan(＜Special Section＞Determination of the Construction of an Outcrop Database to Reveal Eruptive History)
  • 南九州,池田火山の噴火史
  • ミナミキュウシュウ,イケダ カザン ノ フンカシ

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抄録

We made a detailed geological study to understand the eruptive history of the Ikeda volcano, which includes the Ikeda caldera, maars and lava domes. The pre-caldera activity began at about 20 cal kBP with the Iwamoto ash fall deposit. The Senta lava was also effused before the Kikai-Akahoya tephra (7.3 cal kBP). The caldera-forming eruption began at 6.4 cal kBP with a phreatic explosion that produced the Ikezaki ash fall and surge deposits. This was soon followed by the magmatic eruptions that produced the Osagari and Mizusako scoria fall deposits and the Ikeda pumice fall deposit. During the climactic stage, the Ikeda ignimbrite was erupted and covered portions of the coastal area. Immediately after the caldera-forming event, four maars were formed along the fissure vent southeast of the caldera. The Yamagawa maar, which is the largest and is located at the southeastern end of the fissure vent, erupted a pumiceous base surge (the Yamagawa base surge), while the other maars ejected small amounts of accessory or accidental materials. During the late stage of the Ikeda eruption, a phreatomagmatic eruption occurred at the bottom of the caldera floor, which formed the widespread Ikedako ash fall deposit. The central lava dome was formed during the late stage of this eruption. After the Ikedako ash fall, secondary explosions of the Ikeda ignimbrite occurred mainly along the coastal area, generating small base surge deposits. About 2,000 years after the caldera-forming eruption at 4.8 cal kBP, new magmatic activity began on the margin of the caldera rim, and formed the Nabeshimadake lava dome.

収録刊行物

  • 火山

    火山 59 (4), 255-268, 2014

    特定非営利活動法人 日本火山学会

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