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of the resultant horizontal component, and then resolving all pairs to the direction of that
largest component once it is known. At variance with the customary practice, we call
this component the "random" horizontal component. In Figure 10, the difference in the
predictive power of the regression equations derived from both of these definitions is
illustrated for M w = 7.4, and compared against the Kocaeli measurements. We believe
that both sets yield essentially the same results. With the differences between the mean
or the standard deviation curves substantially less than the value of In (a) itself, an
improvement in accuracy does not appear to be plausible between the definitions of
maximum horizontal acceleration.
1 oo
ra
U)
Q.
KOCAELI DATA (Max.Hor Comp )
Max.HorComp
Booreetal (1997)
+/-1 Sigma
001
200
Ambraseysetal (19S6)
Spudichetat (1997)
Sadighetai(1997)
Campbell (1997)
Closest Distance (km)