- Ground-motion model is:
where log A

_{0}(R) is an empirically determined attenuation function from Richter (1958) used for calculation of M_{L}and v is component direction (v = 0 for horizontal 1 for vertical). - Response parameter is pseudo-velocity for 0, 2, 5, 10 and 20% damping.
- Use depth of sedimentary deposits, h, to characterise local geology.
- Depths of sedimentary and alluvial deposits at stations used are between 0 and about 6km and most are less than about 4km.
- Use data and regression technique of Trifunac and Anderson (1977), see Section 4.4.
- Note no obvious physical reason why dependence of PSV on h should be linear. Try including terms with
h
^{2}, h^{3}and higher powers of h but they lead to values which are undistinguishable from zero at 95% confidence level. - Approximate significance tests show that coefficients are significantly different from zero in large subregions of the complete period range.
- Only give coefficients for 11 periods. Graphs of coefficients for other periods.
- Note results are only preliminary.
- Note amount of data too small to include more sophisticated independent parameters.