- Ground-motion model is:
where Y is in cm∕s2, a

_{1}= 0.97412, a_{2}= 0.0074138, a_{3}= -0.0044524 and a_{4}= 2.1041 for mean horizontal; a_{1}= 0.95461, a_{2}= 0.0073811, a_{3}= -0.0045837 and a_{4}= 2.4935 for vectorially-resolved component including vertical; a_{1}= 0.96387, a_{2}= 0.006973, a_{3}= -0.00466 and a_{4}= 2.3969 for vectorially-resolved component using two horizontal components; and a_{1}= 0.98212, a_{2}= 0.0073442, a_{3}= -0.0044279 and a_{4}= 1.7006 for vertical; a_{5}= 0.0261 and a_{6}= 0.9594 for all. σ = 0.70. - Data from 36 rock sites, which recorded between 1 and 23 events.
- All events recorded by ≥ 10 stations so that number of events and stations are comparable.
- Only use earthquakes with Global CMT M
_{w}available. - Focal depths, Z, between 5 and 69km with most ≤ 25km.
- Try a different function for the distance decay (-ln) and find that fits the data almost equally well. Prefer the selected form because it has been used for Japanese models using more data.
- Correlation between parameters is: between M and R 0.49, between M and Z 0.21 and between Z and R 0.41.
- Fit distance decay term of form -ln(R+c) to each earthquake individually. Find a
_{5}and a_{6}from plot of c against M. Choose a_{5}and a_{6}that can be used for all across periods. Next find coefficients a_{1}to a_{4}based on data adjusted by distance decay term. - Find no trends in residuals w.r.t. M, Z or R.
- Plot observations against predictions for magnitude-unit wide intervals and find good fit.
- Note that model is not definitive because many other data available. Believe model is adequate for illustration of how a model can be improved by event, site and path terms.