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| | Abstract | | In recent years, multichannel-type surface wave explorations have been applied to geotechnical and environmental investigations. Although such surface wave exploration is sometimes called a high precision surface wave exploration, there are some problems that should be still improved to obtain a highly accurate analysis. As the present problems with the surface wave exploration, this paper deals apparent phase velocities with multimode surface waves, influences of near-surface high velocity layer and effects of density in cavity investigations. Thereby methods to improve the analysis are studied. For apparent phase velocities with multimode surface waves, a method is suggested to estimate S-wave velocity structures by inverting apparent phase velocities directly. Finally, an accurate and efficient method to compute partial derivatives of group velocity with respect to S-wave velocity using the Haskell matrix method is proposed. |
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