Revolutionary innovations in geophysical methods develop when instruments, techniques, or software evolve to make them possible. A few of these cause dramatic changes in the types of surveys and analysis done. Past examples were shallow reflection surveys and scanning resistivity pseudo-sections. The author believes that surface wave surveys will cause a similar, perhaps extraordinary paradigm shift in geophysics because of the usefulness and interpretability of the data, and the potential for dramatically higher productivity.
Downhole shear-wave surveys may be used for a wide variety of applications that include determining the shear-wave velocity function with depth for static corrections or time-to-depth conversions for petroleum surveys involving shear-wave reflections. However, the principal nonpetroleum application is for investigations of engineering sites.
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