- See Section 2.151.
- Ground-motion model used is:
where α

_{1}and α_{2}are set equal to C_{4}and C_{5}of appropriate PGA equation. - Response parameter, SA, is acceleration for 5% damping.
- Do analysis on response spectral amplification because digitised and processed accelerograms used for spectral attenuation is only a subset of PGA database and they are often those with strongest shaking. Hence analysis directly on spectral accelerations may be biased.
- Smooth coefficients.