The Quaternary Research (Daiyonki-Kenkyu)
Online ISSN : 1881-8129
Print ISSN : 0418-2642
ISSN-L : 0418-2642
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  • Yoshiki Sato, Eisuke Ono, Osamu Fujiwara
    2021 Volume 60 Issue 1 Pages 1-12
    Published: March 01, 2021
    Released: March 19, 2021
    [Advance publication] Released: February 15, 2021
    JOURNALS RESTRICTED ACCESS

    Traces of the 1703 CE Genroku Kanto Earthquake tsunami were investigated by integrating the analyses of historical materials and an excavation survey using a hand auger and a portable geoslicer in Kujukuri Town (former Katakai Village), central Kujukurihama Strand Plain. A comparison of two pictorial maps before and after the 1703 CE earthquake with the modern topographic map shows that the 1703 CE tsunami reached the interridge marsh near the Kujukuri Town Hall, at least 1.4km inland from the present coast. Estimated inundation distance measured from the coast at the time of the tsunami is at least 900m. Results of the excavation survey and diatom fossil analysis suggest that the surface geology, tens of centimeters to 1m deep, consists of sandy beach ridge deposits and overlying muddy wetland deposits. A single sand layer, probably a tsunami deposit, covers the freshwater wetland sediment with a clear basal contact. Radiocarbon ages suggest that this sand layer was deposited after 1,664calAD, and is most likely to correspond to the 1703 Genroku-Kanto earthquake tsunami deposit considering the historical documents.

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