Seismic Behavior of 2D Topographic Features Subjected to Vertically Propagating Incident SV at High Frequencies

This paper focuses on the preliminary results of an extensive 2D parametric study of time domain site response analysis for high frequency input motion. Such study in which direct boundary element used as numerical tool evaluates the effects of such motion on seismic behavior characteristics of various homogenous shapes surface topographies (semi-elliptical, semi-sine and trapezoidal shapes). It is assumed that the medium behaves as a linear elastic material. Also, it is considered that Ricker-typed wavelet input motion is Incident SV in-plane wave. Obtained results are presented in the form of dimensionless parameters that is Shape Ratio (the ratio of height to half width of the topography) and dimensionless frequency (the ratio of half width of the topography to wave length). Hence presented results could be generalized and used for various geometric and input motion values. Parametric study results show that in all geometric cases. Various distributed plane wave interference cause to fully disturbed wave field within the topography as well as a scattering of in-plane waves, where in such condition wave separation is very troublesome. Finally, the responses of 2D analyses at the top of topography for different-typed topographies versus related shape ratios (SR) are calculated and then, compared and correlated with the results of response spectra of a free field Ricker-typed wavelet.