Ryoichi Fukagawa, PhD, is a Professor at Ritsumeikan University, Kyoto, Japan. He earned a BE and an ME in civil engineering at Kyoto University in 1977 and 1979, respectively. He is a member of several societies, including the Japan Society of Civil Engineers, the Japanese Geotechnical Society, the International Society for Soil Mechanics and Geotechnical Engineering, and the International Society for Terrain-Vehicle Systems. He was the head of the Kii Peninsula Disaster Study Group, on which this publication is based, as well as the chairman of the subsequent Research and Study Committee.