Providing NEHRP Soil Classification from the Direct Interpretation of Effective Rayleigh-Wave Dispersion Curves

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Abstract
The effective phase velocity corresponding to the wavelength of 40 m (Ve40) is proposed here as a proxy to provide National Earthquake Hazard Reductionud Program (NEHRP) soil classification. This represents an extension of previously proposed approaches that might be of interest for scientists or practitioners who are using methods for estimating the phase velocity that are not allowing an unequivocalud separation of modes. With respect to previous works, more extensive numerical simulations were carried out by considering 13,000 VS profiles, both includingud normally and inversely dispersive configurations. These indicate that Ve40 provides reliable classifications in more than 80% of cases. This percentage of successes isud comparable with that of standard measurements (down-hole) when realistic experimentalud uncertainties are accounted for

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