Journal of the Sedimentological Society of Japan
Online ISSN : 1882-9457
Print ISSN : 1342-310X
ISSN-L : 1342-310X
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Volume 73, Issue 1
Displaying 1-12 of 12 articles from this issue
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Cover Story
Article
  • Behavior of the 2011 Tohoku-oki tsunami using magnetic fabric and grain-size characteristics of tsunami deposits in the downstream area of the Natori River in the Sendai Plain, northeastern Japan
    Takahiro Shibuya, Yasuhiro Takashimizu, Atsushi Urabe, Koji Suzuki
    2014 Volume 73 Issue 1 Pages 3-17
    Published: June 30, 2014
    Released on J-STAGE: September 04, 2014
    DOIhttps://doi.org/10.4096/jssj.73.3
    JOURNAL FREE ACCESS
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    The 2011 Tohoku-oki tsunami catastrophe has been recorded by aerial photography and video. In this study, we attempted to reconstruct the tsunami behavior by visual core description, grain-size distribution, and magnetic fabric of the tsunami deposits collected in the left bank area of the Natori River near the Yuriage Bridge at Sendai, Miyagi Prefecture. Consequently, we could read the detailed flow changes of the tsunami. We found that, after the first tsunami run-up in the Natori River, the main body of the tsunami run-up on agricultural fields and rice paddies was blocked by the bank of prefectural road 10. Due to this blocking by the bank, the depth of stagnant seawater increased and finally overflowed into the Natori River. Based on our reconstruction of the tsunami behavior, the features of the tsunami deposits also indicated overflow into the Natori River from the agricultural fields and rice paddies. The orientations of the tsunami debris measured from aerial photograph were also consistent with obtained magnetic fabric measurements. Therefore, considering the records of the tsunami video and geological evidence, it was revealed that paleo-current analysis can be performed using the magmatic fabric of tsunami deposits.
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Review
  • Sedimentological studies using beryllium isotopes
    Yutaka Kanai
    2014 Volume 73 Issue 1 Pages 19-26
    Published: June 30, 2014
    Released on J-STAGE: September 04, 2014
    DOIhttps://doi.org/10.4096/jssj.73.19
    JOURNAL FREE ACCESS
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    Sedimentological and geochemical studies using radioactive beryllium isotopes in the environment are reviewed. Their measurement methods are also explained. These nuclides have some characteristics such as their production in the atmosphere of the earth and continuous fall-down on the earth surface, usefulness as tracers owing to high affinity on the grain, radioactive clock of chronology for their own half-lives. Therefore, they have many extensive application studies; for example, the dating of surface/bottom sediments, continental/soil erosion, behaviors of sediments in the river/estuarine.
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