旧汀線高度からみた九州の後期更新世地殻変動様式 Mode of vertical crustal movements during Late Quaternary in Kyushu, Japan deduced from heights of ancient shorelines

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従来の第四紀地殻運動論では, 九州のほぼ全域を隆起地域と解釈してきた.最近, 九州北部各地に沈降域があることが明らかになったので, 堆積相・貝化石群集・生痕化石などの古水深指標と広域テフラに基づいて九州各地の最終間氷期最高海面期(ステージ5e)の旧汀線高度を比較し, 過去約12.5万年間の九州の地殻運動を見直す作業を行った.その結果, 過去12.5万年間の動きは別府〜島原地溝帯を境に, 九州北部は全て沈降地域である.また, 九州南西部にも沈降地域があることが判明した.特に佐伯から川内にかけて九州を北東-南西に横切る1本の顕著な沈降軸(佐伯〜川内沈降軸)が存在する.九州南東部は顕著な隆起地域であることを再確認した.沈降地域や隆起地域の隣接分布は, 現在の九州の海岸地形と極めて調和的である.中期から後期更新世にかけて地殻運動が逆転したと考えられる地域が存在する.これは九州の複雑な地殻運動史を示している.

Data from the ancient shorelines along the present-day coastline of Kyushu Island, Western Japan, show that the island can be divided into several regions on the basis of modes of vertical crustal movements during the past 125,000 years. The heights of the ancient shorelines have been determined using paleodepth indicators such as molluscan faunas, trace fossils and sedimentary structures. The chronology of the sediments and of the tectonic events have been deduced from the well-documented history of volcanic ash events (tephrostratigraphy) of southwestern Japan.The difference between the most uplifted and subsided areas in the island during the past 125,000 years is about 190 meters. Although it was previously thought that the whole of Kyushu Island was an uplifting region throughout this time, the present work has shown that there were marked differential movements.Northern and southwestern Kyushu were steadily subsiding areas, but rapid uplift occurred locally in the southeastern part of the island. A subsiding axis (the Saeki-Sendai Subsiding Axis) crosses the island with a NE-SW trend, and an E-W trending structural depression (the Beppu-Shimabara Graben) is present in central Kyushu.There is a clear correlation between the present-day coastal landforms of the island and the differential tectonic movements that have occurred during the past 125,000 years.

収録刊行物

  • 地質學雜誌

    地質學雜誌 105(5), 311-331, 1999-05-15

    日本地質学会

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各種コード

  • NII論文ID(NAID)
    110003013034
  • NII書誌ID(NCID)
    AN00141768
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    00167630
  • NDL 記事登録ID
    4746173
  • NDL 雑誌分類
    ZM49(科学技術--地球科学--地質)
  • NDL 請求記号
    Z15-174
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS  J-STAGE 
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