The tsunami caused by the Nihonaki Chubu Earthquake (M=7.7) hit the coasts along the Japan Sea on May 26, 1983. This tsunami took about one hundred person's lives and brought severe damages over wide area along the Japan Sea. For example, the sea wall which was under construction for a future reclaimed land at the outside of Noshiro Port was collapsed over 300 meters by the attack of tsunami.
　Directly after the tsunami, the Port and Harbour Research Institute made the field investigations for the areas along the Japan Sea from Hokkaido to Noto Penisula located at the middle of Japan main island in cooperation with many concerning organizations. This report describes the actual conditions of tsunami attacks and damages on the basis of the field investigations and several hydraulic aspects of the tsunami on the basis of laboratory experiments and theoretical calculations.