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| | Abstract | | Distinct P- and SV-wave reflections are frequently recognized in the high-resolution surface wave survey records. Because the settings of data acquisition for the surface wave survey are fundamentally the same as those for seismic reflection survey when using Land Streamer, it is possible to apply S-wave reflection processing steps to the dataset. We conducted a small size levee survey at a site where a bridge foundation was to be constructed. A migrated depth section, obtained through the reflection seismic processing to the surface wave data, clearly reconstructed the near-surface structure down to 40 m.The estimated depths to the unconformity were well concordant with array piling works for the bridge foundation. In addition, CPT and SCPT measurements were carried out to clarify the S-wave and geotechnical properties in the near surface. CPT profiles and VSP processing results were consistent with the depth section. Moreover, it was confirmed that the dominant phases were the direct SV waves which were generated at the surface and reflected from the near-surface boundaries. In conclusion, when conducting surface wave survey densely compatible to the conventional seismic reflection surveying, seismic reflection processing is effective to the near-surface imaging and characterization, especially for levee systems. |
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