地学雑誌
Online ISSN : 1884-0884
Print ISSN : 0022-135X
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水月湖ボーリングコアを用いた天正地震(AD1586)前後の湖底堆積物の分析
齋藤 めぐみ山田 和芳リチャード スタッフ中川 毅米延 仁志原口 強竹村 恵二クリストファー ラムジー
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2013 年 122 巻 3 号 p. 493-501

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 Sediment cores from Lake Suigetsu, Japan, reveal the absence of seawater intrusion into the lake caused by the historically documented tsunami of AD1586 (Tensho Tsunami). A high-precision chronology of the cores established by Bayesian modeling radiocarbon determinations enables us to ascertain the precise position of the historical event in the sediment depth. Diatom analysis of the core shows that a diatom assemblage dominated by freshwater taxa persisted through the period. This makes a clear contrast with the core section around AD1664 when the lake was artificially connected to the sea by a channel, and the subsequent intrusion of seawater was clearly recorded in the sediment cores by the occurrence of marine diatom fossils.

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© 2013 公益社団法人 東京地学協会
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