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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 grid nodes at the surface as similar to internal grid nodes. Therefore, we adopted the same conventional formulation of the program by Amrouche and Yamanaka (2012) of inversion. To validate the program for improved method, we conducted numerical experiments of the waveform inversion analysis using synthetic observed data with white noise on the surface of soil model of an embankment and an artificial filled ground. As a result, these target models can be well reconstructed from surface wave, reflected wave and diffracted wave due to irregularities of surface topography. It is indicated the effectiveness of the proposed waveform inversion method. |
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