Relative Sea-level Changes and Co-seismic Uplifts Over Six Millennia, Preserved in Beach Deposits of the Kujukuri Strand Plain, Pacific Coast of the Boso Peninsula, Japan.

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  • MASUDA Fujio
    Department of Geology and Mineralogy, Graduate School of Science, Kyoto University
  • FUJIWARA Osamu
    Tono Geoscience Center, Japan Nuclear Cycle Development Institute
  • SAKAI Tetsuya
    Department of Geology and Mineralogy, Graduate School of Science, Kyoto University
  • ARAYA Tadashi
    Department of Geology and Mineralogy, Graduate School of Science, Kyoto University

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  • 房総半島九十九里浜平野の海浜堆積物から求めた過去６０００年間の相対的海水準変動と地震隆起
  • ボウソウ ハントウ クジュウクリハマ ヘイヤ ノ カイヒン タイセキブツ カラ モトメタ カコ 6000ネンカン ノ ソウタイテキカイ スイジュン ヘンドウ ト ジシン リュウキ

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Abstract

Relative sea-level changes and variations in shoreline progradation rate over the past 6000 years are elucidated from the elevations of the beach deposits, their 14C ages, and the geographic position of each locality on the Kujukuri strand plain, Pacific coast of the Boso Peninsula, central Japan. These past sea-levels were +4 to +6 m above the modern sea-level (high-stand stage) at 6000 to 5300 calendar years B.P., +3 to + 4.5 m (stable stage) at 5000 to 3500 years B.P., declined from +1.2-+ 3.4 m to + 0.5-+ 2.1 m (falling stage) at 3300 to 2250 years B.P., and were-1.5--1 m to + 1 m (stable stage) from 1650 to 250 years B.P. ; sea level is 0 m at present. The detailed changes revealed by this new method strongly imply the existence of several rapid uplifts (0.4 to 1.2 m per event) at 5100 to 5500 years B.P., 3400 years B.P., 2400 years B.P., 1650 years B.P., and 0-250 years B.P. The uplifts were co-seismic, because the speed of occurrence seems to have been high, and the events are generally associated with so-called “tsunami deposits.” Co-seismic uplift in this region has not been reported previously from historical records or geological evidence.

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