Identification of the source horizon of earthquake-jetted sand based on grain size characteristics and sand fraction composition

DOI Web Site 参考文献24件
  • INOUE Takahiko
    Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology
  • KIMURA Katsumi
    Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology
  • MIYACHI Yoshinori
    Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology
  • HARAGUCHI Tsuyoshi
    Graduate School of Science, Osaka City University
  • TANABE Susumu
    Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology
  • INOUCHI Yoshio
    Center for Marine Environmental Studies, Ehime University

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The origin of jetted sand caused by liquefaction due to two earthquakes in Miyagi Prefecture in 2003 was studied by grain size and sand fraction analysis. Core sediment samples were obtained by drilling and Geoslicer in the Ushiami and Hamaichi areas of Naruse, Miyagi Prefecture, where were seriously affected by liquefaction. The core samples consisted of four sediments: (1) surface jetted sand, (2) the original surface soil, (3) coarse artificial back-filled sand, known locally as "Yamazuna" sand, and (4) ancient beach-sand, in descending order. Grain-size analysis showed that, grain-size parameters of jetted sand in the Ushiami area were similar to those of the uppermost part of the ancient beach sand layer. In the Hamaichi area, grain-size characteristics of the jetted sand was similar to both the "Yamazuna sand" layer and the beach sand layer, but sand fraction modal compositions of the jetted sand corresponded to those of the beach sands. These results indicate that the Naruse jetted sands originated from the ancient beach-sand layer, which had previously been considered to be resistant to liquefaction arising from earthquakes.

収録刊行物

  • 地球科学

    地球科学 60 (4), 315-324, 2006

    地学団体研究会

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