The seismic codes of many countries base their site classifications on the Vs30 parameter, i.e., the average shear-wave velocity in the first 30 m of subsoil. And yet, despite the widespread use of this parameter, there is not universal agreement that this is a valid proxy for seismic amplification. There is no doubt that since the shear-wave subsoil velocity (Vs) is tied to soil rigidity, the profile of the former must have a role in site effects (Shearer and Orcutt 1987; Cranswick et al. 1990). However, seismic amplification appears too complex to be related to the Vs...

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