- Ground-motion model is:
_{10}A_{0}(R) is an empirically determined attenuation function from Richter (1958) used for calculation of M_{L}, v is component direction (v = 0 for horizontal and 1 for vertical), M_{min}= -b(T)∕(2f(T)) and M_{max}= (1 - b(T))∕(2f(T)). - Response parameter is pseudo-velocity for 0, 2, 5, 10 and 20% damping.
- Characterises site condition by depth of sedimentary and alluvial deposits beneath station, h. Uses records with 0 ≤ h ≤ 6km, with most < 4km.
- Performs analysis to minimize possible bias due to uneven distribution of data among magnitude, site conditions and from abundance of data for some earthquakes.
- Tries terms with higher powers of h but coefficients are undistinguishable from zero at 95% confidence level.
- Assumes probability that log
_{10}PSV(T) - log_{10}(T) ≤ ϵ, where log_{10}PSV(T) is measured PSV and (T) is predicted PSV and ϵ is a probability, can be expressed as p(ϵ,T) = [1 - exp(-exp(α(T)ϵ(T) + β(T)))]^{N(T)}. This assumption passes Kolmogorov-Smirnov and χ^{2}tests at 95% level. - Finds a(T) through g(T) significantly different than zero for large subregions of whole period range. d(T) is only significantly different than zero for T ≳ 0.3s.
- Gives coefficients of smoothed results for 11 periods.
- Notes only preliminary. Improvements should be based on physical nature of phenomenon using a functional form predicted by theory and experiment but due to lack of data cannot be done.