1. 1) GRAVES, R. W. : Simulating seismic wave propagation in 3D elastic media using staggered-grid finite differences, Bull. Seism. Soc. Am., vol. 86, pp. 1091–1106, 1996.
2. 2) BARD, P. -Y. and BOUCHON, M. : The seismic response of sediment-filled valleys. Part 2. The case of incident P and SV waves, Bull. Seism. Soc. Am., vol. 70, pp. 1921-1941, 1980.
3. 3) SÁNCHEZ-SESMA, F. J., BRAVO, M. A. and HERRERA, I., : Surface motion of topographical irregularities for incident P, SV, and Rayleigh waves, Bull. Seism. Soc. Am., vol. 75, pp. 263-269, 1985.
4. 4) KAWASE, H. : Time-domain response of a semi-circular canyon for incident SV, P, and Rayleigh waves calculated by the discrete wavenumber boundary element method, Bull. Seism. Soc. Am., vol. 78, pp. 1415-1437, 1988.
5. 5) SÁNCHEZ-SESMA, F. J., PÉREZ-ROCHA, L. E. and CHÁVEZ-PÉREZ, S. : Diffraction of elastic waves by three-dimensional surface irregularities. Part II, Bull. Seism. Soc. Am., vol. 79, pp. 101-112, 1989.