Variation of the mean sea level around the Japanese Islands is investigated using yearly mean sea level data at 6 points from 1894 to 1990. Mean sea level has risen along the eastern coast of Japan 1-2 mm/year but it has fallen along the Japan Sea coast 0-1 mm/year. The prediction of the horizontal distributions of sea level for 2030 around Japan was found to rise on the basis of IPCC (Intergovernmental Panel of Climate Change) and also this study.

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