GROUND MOTION OF TOPOGRAPHICAL IRREGULARITIES FOR INCIDENT P, SV AND RAYLEIGH WAVES

Effects of irregular topography on ground motion for incident P, SV and Rayleigh waves are studied by combining finite element method with modified transmitting boundary. Theoretical models include isolated-protruding topography and similar-adjacent-protruding topography. The conclusion drawn from this study is that the effects of isolated-protruding topography are remarkably larger for incident Rayleigh wave than for P and SV body waves; considering adjacent irregular topography, ground motion is amplified, the duration of ground motion becomes longer and the spectral ratios exhibit narrowband peaks