천부 불균질대에 의한 레일리파 전파 및 분산특성 고찰

초록

investigated in this study using two-dimensional FEM elastic modeling. Various inhomogeneity models with a variety ofgeometrical shape and embedment depth which exist in homogeneous half-space and two-layered media are considered.Results show that any near surface inhomogeneity greater than one wavelength in terms of minimum wavelength ofRayleigh wave shows dispersion characteristics. Such dispersion effect become stronger as the dimensions of theinhomogeneity increase. The effect of horizontal dimension is more dominant factor governing the dispersion characteristicsthan vertical dimension. However, the dispersion effect can not be identifiable in seismogram if the horizontal dimensionis not wide enough. Nonetheless, even in this case, the existence of inhomogeneity can be inferred by the reflection ortransmision event of Rayleigh wave. The results can be expected to provide insights on the behavior of Rayleigh wavesurface wave method.

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