Chiou and Youngs PEER-NGA Empirical Ground Motion Model for ...

non-California, and Taiwan earthquakes, versus RRUP for a range of magnitude intervals. The
residuals do not exhibit any trends with respect to magnitude or distance.
Figures 36a through 36d show the intra-event residuals plotted versus VS30 both as a composite plot
and for individual ranges of reference ground motion amplitude. Again, the residuals do not exhibit
any systematic trends. Note that the soil model assumes that there is no deamplification of ground
motions below the reference ground motion level of SA1130 for sites with VS30 greater that 1130 m/sec.
Although there is very little data in the PEER-NGA data base for sites with VS30 greater that 1130
m/sec, the limited data, if anything, suggest a slight upward trend in the residuals. The site
amplification model developed here does not account for the effect of the lower kappa expected for
hard rock sites which would tend to lead to increases in high frequency ground motions.
resid
resid
resid
2
1
0
-1
-2
2
1
0
-1
-2
1
0
-1
-2
Calif
Taiwan
2 3 4 5 6 7 8 910 20 30 40 5060
5 6 7
Mag
ClstD
2 3 4 5 6 7 8 910 20 30 40 5060
Non-Calif
2
1
0
-1
-2
C&Y2006 Page 49
resid
resid
2
1
0
-1
-2
2
1
0
-1
-2
2 3 4 5 6 7 8 910 20 30 40 50 60
4.2+ thru 4.8
2 3 4 5 6 7 8 910 20 30 405060
ClstD
2 3 4 5 6 7 8 910 20 30 405060
4.8+ thru 5.4
6.0+ thru 6.6 6.6+ thru 7.2
ClstD
5.4+ thru 6.0
7.2+ thru 7.8
2 3 4 5 6 7 8 910 20 30 405060
Figure 35a: Intra-event residuals for spectral period of 0.01 seconds (pga).
5 6 7
Mag
resid
1
0
-1
-2
2 3 4 5 6 7 8 910 20 30 40 50 60
ClstD
2
1
0
-1
-2