Reconstruction of Paleoenvironment and Identification of Historical Tsunami Deposits by Geochemical Analyses in Iwanuma City, Miyagi Prefecture, Japan

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  • OGATA Yusuke
    Department of Earth Science, Graduate School of Science, Tohoku University
  • GOTO Kazuhisa
    Department of Earth and Planetary Science, The University of Tokyo
  • SHINOZAKI Tetsuya
    Research Institute of Earthquake and Volcano Geology, National Institute of Advanced Industrial Science and Technology
  • IKEHARA Minoru
    Center for Advanced Marine Core Research, Kochi University
  • CHAGUÉ Catherine
    School of Biological, Earth and Environmental Sciences, UNSW Sydney
  • KAWAMATA Takao
    Educational Committee, City of Iwanuma
  • YOKOYAMA Yusuke
    Atmosphere and Ocean Research Institute, The University of Tokyo
  • MIYAIRI Yosuke
    Atmosphere and Ocean Research Institute, The University of Tokyo
  • ISHIZAWA Takashi
    International Research Institute of Disaster Science, Tohoku University
  • TETSUKA Hiroshi
    Department of Earth Science, Graduate School of Science, Tohoku University

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  • 宮城県岩沼市における地球化学分析を用いた古環境復元と歴史津波堆積物の認定
  • ミヤギケン イワヌマシ ニ オケル チキュウ カガク ブンセキ オ モチイタ コ カンキョウ フクゲン ト レキシ ツナミ タイセキブツ ノ ニンテイ

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Abstract

<p> Identifying invisible tsunami deposits in the geological record is challenging and requires multiproxy analyses. In particular, geochemical signatures provide useful information for identifying paleo-tsunami deposits, as well as for reconstructing the paleoenvironment history, even when other proxies are equivocal. In addition, geochemical proxies help to provide an understanding of environmental changes that occur post-tsunami. As a result, they are now frequently used in paleotsunami research. Tsunami deposits are identified on the Sendai Plain, Japan, and environmental changes over time are reconstructed based mainly on geochemical data. Using a high-resolution elemental analysis with XRF core scanning, evidence of seawater inundation is discovered that is difficult to recognize with a naked eye. Based on the combined results of multiproxy analyses, together with radiocarbon dating, not only a 1611 Keicho tsunami deposit but also a minor signal of a potential 1454 Kyotoku tsunami deposit are identified.</p>

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