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| | Abstract | | Distinct P- and SV-wave reflection events are often observed in datasets of high-resolution active surface wave surveys. Accordingly, it is capable of applying usual P- and S-wave seismic reflection processing to the acquired dataset along with the conventional multichannel analysis of surface waves. In particular, the SV-wave reflection section can provide detailed geological structure of the near surface. We conducted a detailed and repeated field measurement at a site where road embankment had partly collapsed. The survey consisted of the hybrid surface wave survey, DC resistivity survey, GPR, and high-frequency surface wave measurement along a total of 10 survey lines. S-wave VSP measurements were also carried out at two points in the site. Furthermore, P- and S-wave seismic reflection processing was applied to a total of 5 datasets of active surface wave survey. As a result, the depth sections were fundamentally concordant with S-wave velocity sections reconstructed from surface wave survey data, and with S-wave VSP results. In conclusion, seismic reflection analysis is effective, when conducting an active surface wave survey densely comparable to the conventional seismic reflection surveying, for the comprehensive interpretation of the near surfaces. |
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