Abstract
The Isawa Dam is an earth center core type rockfill dam and the dam body has been under construction. At 8:43 a.m. on June 14 of 2008, an earthquake which epicenter was located in the southern part of Iwate prefecture and 10km away from the Isawa dam was occurred. The earthquake caused damages on the dam body and the spillway of the Isawa Dam. As regards the spillway, the cracks of the structures, the damages on the foundation, etc. were occured. This paper reports the characteristics of the cracks induced by the earthquake and the investigation method, and discusses the causes of the damages.Keywords: The Iwate-Miyagi Nairiku Earthquake in 2008, spillway, crack, investigation, repair work
