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Copyright 2005 by CRC Press where PGA is either uncorrected PGA or corrected PGA, depending on the application (see footnote to Table 17.5). The regression coefficients are listed in Table 17.5 and Table 17.6. The relation is considered valid for MW > 4.7 and rseis < 60 km.

The relation predicts ground motion for firm soil, equivalent to the condition SFS = 1, unless one of the site parameters in g(S) and f4(S) is set to one, in which case it predicts ground motion for either very firm soil, soft rock, or firm rock. The relationship between the faulting mechanism parameters FRV (reverse faulting with dip greater than 45°) and FTH (thrust faulting with dip less than or equal to 45°) and the rake angle 1 is7 (a) strike slip: F = 0, rake angle 1 = 0-22.5, 177.5-202.5, 337.5-360; (b) normal: F = 0, rake angle 1 = 202.5-337.5; (c) reverse (FRV = 1) F = 1.0, rake angle 1 = 22.5-157.5 (d > 45); and (d) thrust (FTH = 1) F = 1.0, rake angle 1 = 22.5-157.5 (d < 45).

Sediment depth D was evaluated and found to be important, but it was not included as a parameter, since it is rarely used in engineering practice. If desired, sediment depth can be included in an estimate of ground motion by using the attenuation relation developed by Campbell (1997, 2000, 2001).

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