1. 1) Japanese Geotechnical Society (1996) : “Selected photographs on the damage caused by the 1995 Hyogoken-Nambu earthquake, ” Soils and Foundations, Special Issue on the 1995 Hyogoken-Nambu Earthquake.
2. 2) Japanese National Railways, Osaka Shinkansen Construction Division (1972) : Sanyo Shinkansen (Shin-Osaka-Okayama) Geological Map (in Japanese).
3. 3) Yoshikawa, K. (1981) : “Investigation about past earthquake disasters of railway tunnels, ” Quarterly Reports of RTRI, Vol. 22, No. 3.