八戸市の沖積層層序とその応用地質的考察

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書誌事項

タイトル別名
  • Alluvium Stratigraphy and Engineering Geology in the Hachinohe City
  • ハチノヘシ ノ チュウセキソウソウ ジョ ト ソノ オウヨウチ シツテキ コウサツ

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抄録

Alluvial deposits occupy from the surface to 45 meters below the sea level around the Hachinohe City, and they are lithologically divided into the Konakano, Naganawashiro and Ruike Formations in ascending order. The Konakano Formation consists of basal gravel, sand and silt. The Naganawashiro Formation consists of graded sand and marine clay in which sometimes shell fragaments and pumice are observed. The Ruike Formation is composed of various kinds of sediments including organic remain and fossils which indicate 5, 280±100y. B. P. by the carbon-14 ages.<BR>Also the data of wells reveal the details of buried terraces, buried talus and several buried sand-gravel strata. The buried river terrace surfaces are present in three levels. They are the higher surface (The Kawaragi Surface) of 5-14 meters below the sea level, the middle surface (The Tamonoki Surface) of 5-21 meters below the sea level and the lower surface (The Nakui Surface) of 24-37 meters below the sea level in respective heights.<BR>The decision of bearing stratum for civil construction is under the control of vertical and horizontal distribution of Alluvial gravels and clayey sediments. For example, in case of small scale construction, the bearing stratum can be decided on a graded bedding of the Naganawashiro Formation which indicates a series of column of gravel, sand and clayey sediments in ascending order. On the contrary, in case of large scale construction, it is necessary for the bearing stratum to examine the subsidence for consolidation of clayey sediments, and to perforate until basal gravels of the Konakano Formation or Diluvium including buried river terrace deposits.

収録刊行物

  • 応用地質

    応用地質 45 (4), 183-191, 2004

    一般社団法人 日本応用地質学会

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