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| | Abstract | | In this study, we improved the waveform inversion algorithms using forward wave calculation based on 2.5D finite-different method for shallow seismic refraction data by Amrouche and Yamanaka (2012) for the use of soil with irregular surface topography. In the finite-different method as forward modeling, a vacuum formulation was used to treat the boundary condition on grid nodes at the surface as similar to internal grid nodes. Therefore, we adopted the same conventional formulation of the inversion by Amrouche and Yamanaka (2012). To validate the program for the improved waveform inversion method, we conducted numerical experiments of the waveform inversion analysis using synthetic observed data on the surface of soil model of an embankment. An assumed irregularity zone with low S-wave velocity can be well reconstructed from the inversion of the synthetic data indicating a high performance of the proposed waveform inversion method to detect a velocity anomaly in shallow soil with a irregular surface topography. |
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