Ishihara, K. (1996) Soil Behaviour in Earthquake Geotechnics, Oxford Engineering Science Series, Oxford Science Publications, Clarendon Press, Oxford  TC4 Committee of ISSMFE, (1993). Manual for Zonation on Seismic Geotechnical Hazard. Japan Society of Soil Mechanics and Foundation Engineering.  Bolt, B.(1995) Earthquakes, W.H. Freeman and Company, New York  Kramer, S.L. (1996) Geotechnical Earthquake Engineering, Prentice Hall, New Jersey  Youd,L.T. & Idriss, I.M. (1997) Evaluation of Liquefaction Resistance of Soils, Proceedings of the NCEER Workshop, NCEER Technical Report 97-0022, State University of new York at Buffalo, New York  Liam Finn,W.D.(1991) Dynamic Analysis in Geotechnical Engineering Proc. of ASCE Spe.Conf. Earthquake Engineering and Soil Dynamics II. pp523-591.  Japan Society of Civil Engineers (2000) Earthquake Resistant Design Codes in Japan, Japan Society of Civil Engineers, Tokyo, Japan  B.M.Das, Principles of Soil Dynamics, 1993.