- Ground-motion model is:
- Response parameter is velocity for unspecified
- Do regression iteratively. Assume a(ω), b(ω) and c(ω). Find amplification factors, Gi(ω), for each response
spectra, Ri(ω): Gi = Ri(ω)∕SV 0. Calculate amplification factor, G, for each site: G = .
Estimate bedrock spectrum, Bi(ω), for each record: Bi(ω) = Ri(ω)∕G(ω). Find a(ω), b(ω) and c(ω)
by least squares. Repeat these steps until convergence. Hence find attenuation relation for bedrock and
amplification function for each site.