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• W2316579521 abstract "In geotechnical site characterization, soil stratigraphy is commonly established using limited borehole profiles, standard penetration tests, seismic cone penetration (SCPTu) and seismic first arrival data. Shear modulus is an important parameter, which can be obtained by determining the variation of shear wave velocity Vs with depth. The inversion of surface wave dispersion data (e.g MASW), which can quickly provide such information for a large area, is an attractive option for the geotechnical and earthquake engineering community. However, obtaining reliable and unique inversions of phase velocity dispersion curves is far from simple, beginning with the question “How much information about the soil strata does the dispersion curve contain?” Answer‐ very little compared to what the geotechnical engineer would like to know. In general dispersion curves are smooth, and if for example a dispersion curve has the shape of an nth order polynomial, then from a statistical perspective the curve contains n independent pieces of information. The goal of inversion is to transform the n pieces of information available in the dispersion curve to corresponding soil parameters. Following Ginsberg's Theorem, the inversion can yield at most n soil parameters, but n is always a small number in comparison to the amount of information wanted by the geotechnical engineer. The solution to this problem depends on simultaneously inverting the maximum amount of data (from Rayleigh waves, Love waves, higher modes, first arrivals), and on inserting additional information a priori into the inversion process. The number of layers, Vp/Vs ratio, and depth to bedrock are among the parameters that are commonly specified at the outset of inversion, but the use of a priori information to constrain the inversion can lead to wrong (but plausible) results. Subtly, the model underlying the inversion may be wrong. Commonly, surface wave inversion is based assumed homogeneous layers, but the in situ shear modulus in a layer having homogeneous composition varies with pore pressure and depth. The problem is to educate geotechnical engineers about the benefits and potential pitfalls inherent in the technology. The authors offer their personal observations on the current state‐of‐the‐art and exciting future for MASW as a routine site characterization tool." @default.
• W2316579521 created "2016-06-24" @default.
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• W2316579521 date "2011-01-01" @default.
• W2316579521 modified "2023-09-26" @default.
• W2316579521 title "Inverting Surface Wave Data for Geotechnical and Geophysical Site Characterization: A Personal Perspective" @default.
• W2316579521 doi "https://doi.org/10.4133/1.3614274" @default.
• W2316579521 hasPublicationYear "2011" @default.
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