- Ground-motion model is:
where Y is in cm∕s2, C = 4.053, α = -2.797, β = 0.251, R0 = 8.84 and σ = 0.257.
- Use same data as Joyner and Boore (1981), see Section 2.37.
- Use a two-stage method based on Joyner and Boore (1981). Firstly fit data to log Y = C +
i=1n(aiEi)log(Ri + R0), where Ei = 1 for records from ith earthquake and Ei = 0 otherwise, to find C
and ai for each earthquake. Next fit a = α + βM to find α and β using ai from first stage.