Abstract
Large earthquakes along the Kuril subduction zone have caused tsunami damage on the Pacific coast of eastern Hokkaido, including Kushiro area, northern Japan. Twenty-two postulated tsunami deposits (named htd1 to htd22) in the Holocene sediments cored from Lake Harutoriko, Kushiro City were already described by sedimentary methods and dated by AMSC and tephrochronological methods. In this study, we carried out diatom assemblage analysis to study the paleoenvironments in detail. As a result of our study, we identified drastic changes of the diatom assemblages in this core. We infer that these changes were generated by repeated great earthquake tsunamis along the Kuril subduction zone. * 北海道開拓記念館 ** (独)産業技術総合研究所地質情報研究部門 * Historical Museum of Hokkaido ** Institute of Geology and Geoinformation, Geological Survey of Japan, AIST 平成 16年度助成金使用報告 地学雑誌 Journal of Geography 114(4)626‒63
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