2025 Volume 35 Issue 2 Pages 208-219
The Mizuho Dam is a center core-type rockfill dam. On September 6, 2018, an earthquake was occurred in the eastern Iburi region of Hokkaido recording a maximum seismic intensity of 7. Mizuho Dam, located about 19 km away from the epicenter, suffered extensive damages: cracks near the top of dam body and the collapse of slopes around the dam reservoir causing soil and sand to flow into the reservoir. As a result, restoration work on The Mizuho Dam was carried out as a national disaster restoration project and was completed in 2023. This paper reports on the damage to the dam caused by the earthquake, and outlines of the repair work.
