Civil Engineering Reference
In-Depth Information
FIGURE 5.21
Peak ground acceleration (%
g
) with a 10 percent probability of exceedance in 50 years for
Hawaii. (
USGS 1996.
)
●
USGS earthquake maps:
Instead of using seismic maps such as shown in Figs. 5.18 to
5.21, the USGS enables the Internet user to obtain the peak ground acceleration (PGA)
for a specific Zip code location (see Fig. 5.22). In Fig. 5.22, PGA is the peak ground
acceleration, PE is the probability of exceedance, and SA is the spectral acceleration.
For this project (i.e., the W. C. H. Medical Library), a summary of the different values
of peak ground acceleration
a
max
is provided below:
a
max
0.189
g
(historical earthquakes, see Fig. B.4)
a
max
0.212
g
(10% probability of exceedance in 50 years, see Fig. 5.22)
a
max
0.280
g
(5% probability of exceedance in 50 years, see Fig. 5.22)
a
max
0.389
g
(2% probability of exceedance in 50 years, see Fig. 5.22)
a
max
0.40
g
(seismic zone 4, see Table 5.5)
a
max
0.420
g
(largest maximum earthquake, see Fig. B.13)
