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The objectives of this study are to investigate sizes and areas of ice floes by using photographs obtained during the field survey conducted after the tsunami and, on that basis, to estimate the masses of floes transported by the tsunami. Sizes and areas of them were measured using an image analysis technique and ice thicknesses are measured on site. In an extreme case, the estimated masses were approximately 1.2 to 20 ton on average and 5.0 to 170 ton as maximums of floes retained near the bridge piers. 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