Sedimentary facies, diatom assemblages, physical properties and radiocarbon ages of the latest Pleistocene to Holocene incised valley fills under the central area of the Nakagawa Lowland, Kanto Plain, central Japan

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  • 埼玉県春日部市東備後地区に分布する沖積層の堆積相，珪藻化石群集，物性，放射性炭素年代値
  • 埼玉県春日部市備後東地区に分布する沖積層の堆積相,珪藻化石群集,物性,放射性炭素年代値
  • サイタマケン カスカベシ ビンゴヒガシチク ニ ブンプスル チュウセキソウ ノ タイセキソウ ケイソウ カセキ グンシュウ ブッセイ ホウシャセイ タンソ ネンダイチ
  • Sedimentary facies, diatom assemblages, physical properties and radiocarbon ages of the latest Pleistocene to Holocene incise valley fills under the central area of the Nakagawa Lowland, Kanto Plain, central Japan

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Abstract

    Heavy collapse damage of wooden houses had been reported in some area of the Nakagawa Lowland in the eastern part of Saitama Prefecture, about 100 km distant from the hypocenter of the AD 1923 Great Kanto earthquake. To examine the geology of shallow under ground (less than 50 m depth) in the heavy damaged area, we analyzed the sedimentary facies, diatom assemblages, physical properties, and AMS radiocarbon agesin the latest Pleistocene to Holocene incised-valley sediments at the kasukabe city. On the result, we recognized seven sedimentary facies; braided river channel fills, meandering river floodplain sediments, tidal flat sediments, tideinfluenced transgressive shallow marine sediments, upward-shallowing marine sediments, salt marsh sediments, and modern river channel fill to floodplain sediments, in ascending order. Muddy sediments are observed in the depth range of 0-20 m. These sediments are characterized by low-density, high-water-contents, and lowSPT-N-value. They accumulated at the rate of 0.5 mm/yr since 9,000 cal BP in the Inner Tokyo Bay. These soft sediments should be especially attended for future large earthquakes.

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