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| | Abstract | | Very shallow seismic reflection was adopted to investigate the shape of buried base of an existing check dam. The receivers and shot points were placed on the crown of dam. Reflection imaging of the base of dam was attempted by CMP stacking and pre-stack depth migration (PSDM) with constant velocity. Though PSDM has an advantage in dealing with irregular surface topography, it needs the correct velocity model to provide the correct image. In the case of a concrete structure whose elastic property is expected not to differ from the typical one, PSDM processing is effective. We confirm the availability of this method through the simulation using 2D synthetic waveform records. Even though the wavelength of the P wave propagating through concrete is long compared to required precision, the reflection surface can be determined with certain accuracy. |
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