熊本平野地下に分布する最終間氷期の堆積物と平野の沈降速度

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タイトル別名
  • Subsidence Rate and Sediments of the Last Interglacial Epoch in the Kumamoto Plain, Japan.
  • クマモト ヘイヤ チカ ニ ブンプスル サイシュウ カンヒョウキ ノ タイセキ

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抄録

Several deposits of the Last Interglacial Epoch under the Aso-4 pyroclastic flow deposit are distributed around Ariake Bay, Kyushu, southwestern Japan. The Miyuki Formation, with marine sediments at its middle horizon, has been newly found between the Aso-3 and Aso-4 pyroclastic flow deposits under the Kumamoto Plain. Lithofacies of the Miyuki Formation change from the basal gravel bed through the middle marine clay with a few gravels, to the upper gravel bed. The ages of the Aso-3 and Aso-4 pyroclastic flow deposits are estimated to be 120, 000 years BP and 80, 000 years BP, respectively. Consequently, the Miyuki Formation was composed of buried terrace deposits formed during the Obaradai Age of the Last Interglacial Epoch. Based on the deposition time and depth of the middle member of the Miyuki Formation, the subsidence rate in the Kumamoto Plain has been estimated. The subsidence rate is about 0.45mm/year in the eastern part and 0.90mm/year in the western part of the Kumamoto Plain.

収録刊行物

  • 第四紀研究

    第四紀研究 34 (5), 335-344, 1995

    日本第四紀学会

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