It is well known that local geology, particularly overburden, can greatly increase ground shaking during an earthquake; the best method for determining the degree of amplification remains controversial, however. The so-called site response is a localized resonant amplification of seismic wave motion that is largely controlled by the thickness, shear modulus, and viscosity of soft soil layers. Accurate knowledge of site-response spectra is important for understanding potentially destructive amplification that could occur during a large earthquake, as well as for calibration of seismic networks. In the absence of cosited measurements of ground motion in deep bedrock and at the surface,...

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