2024 Volume 80 Issue 17 Article ID: 24-17088
The 2024 Noto Peninsula earthquake tsunami propagated through the Sea of Japan and reached the coast of Niigata Prefecture. The distribution of debris’ elevations was investigated for totally seven days in January and March, from Kashiwazaki City, Niigata Prefecture to Nyuzen Town, Toyama Prefecture. The tsunami elevations were identified mainly debris with information of local citizen and ground level from publicly available video clips. The run-up heights (ground level) were measured by RTK-GNSS, and the inundation depths were measured by staff from the ground level.
The results of the trace height distribution differed greatly between the natural coast, which is open to wind waves, and the closed area by ports and fishing harbors. The former had a run-up height of approximately 5 m(T.P.) and a maximum of over 7 m(T.P.), while the latter had a maximum of less than 3 m(T.P.). The run-up heights were also measured in some of the rivers. The heights measured in the rivers were intermediate between the natural coast and the harbors. These trace heights are considered to be due to the degree of superposition of tsunami and wind waves, and it is clarified that this superposition is also important from the viewpoint of disaster prevention.
