Civil Engineering Reference
In-Depth Information
APPENDIX B
EQSEARCH, EQFAULT, AND
FRISKSP COMPUTER
PROGRAMS
Appendix B presents data from the EQSEARCH, EQFAULT, and FRISKSP (Blake 2000
a, b, c) computer programs. These computer programs can be used to determine the peak
ground acceleration (
a
max
) at the designated site. Each computer program is discussed
below.
1.
EQSEARCH Computer Program (Figs. B.1-B.11).
The purpose of this computer
program is to perform a historical search of earthquakes. For this computer program, the
input data are shown in Fig. B.1 and include the job number, job name, site coordinates
in terms of latitude and longitude, search parameters, attenuation relationship, and other
earthquake parameters. The output data are shown in Figs. B.2 to B.11. As indicated in
Fig. B.4, the largest earthquake site acceleration from 1800 to 1999 is
a
max
0.189
g.
The EQSEARCH computer program also indicates the number of earthquakes of a cer-
tain magnitude that have affected the site. For example, from 1800 to 1999, there were two
earthquakes of magnitude 6.5 or larger that impacted the site (see Fig. B.5).
2.
EQFAULT Computer Program (Figs. B.12-B.19).
The EQFAULT computer pro-
gram (Blake 2000a) was developed to determine the largest maximum earthquake site
acceleration. For this computer program, the input data are shown in Fig. B.12 and include
the job number, job name, site coordinates in terms of latitude and longitude, search radius,
attenuation relationship, and other earthquake parameters. The output data are shown in
Figs. B.13 to B.19. As indicated in Fig. B.13, the largest maximum earthquake site accel-
eration
a
max
is 0.4203
g.
3.
FRISKSP Computer Program (Figs. B.20-B.25).
Figures B.20 to B.25 present a
probabilistic analysis for the determination of the peak ground acceleration at the site using
the FRISKSP computer program (Blake 2000c). Two probabilistic analyses were per-
formed using different attenuation relationships. As shown in Figs. B.21 and B.23, the data
are plotted in terms of the peak ground acceleration versus probability of exceedance for a
specific design life of the structure.
B.1
