Sentences with phrase «older tsunami deposits»
Judging from geological traces of two even older tsunami deposits, Koji Minoura, an Earth scientist at Tohoku University in Sendai, and his colleagues proposed in 2001 that giant waves visit the region about every 800 - 1,100 years (K. Minoura et al..
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The oldest tsunami sand layer was deposited approximately 1700 years ago, and the average interval between tsunami deposits is 300 - 340 years.