- Ground-motion model is:
where Y is in g, a = 0.2, for M ≤ 6 α

_{0}= -0.150, α_{1}= 2.261, α_{2}= -0.083, β_{0}= 0, β_{1}= 1.602, β_{2}= -0.142 and σ = 1.39 - 0.14M and for M > 6 α_{0}= -0.050, α_{1}= 3.477, α_{2}= -0.284, β_{0}= 0, β_{1}= 2.475, β_{2}= -0.286 and for M < 7 σ = 1.39 - 0.14M and for M ≥ 7 σ = 0.38. - Records from rock sites.
- Uses three fault mechanisms:
- F=0
- Strike slip
- F=0.5
- Oblique
- F=1
- Reverse

- Separate equations for M ≤ 6 and M > 6.
- Examines residuals for PGA. Finds average residual almost zero over entire distance range; trend reasonable up to about 60km but beyond 60km relationship would underestimate recorded PGA.
- Finds standard deviation to be linear function of magnitude.