Procedures and criteria for increasing the earthquake resistance level of electrical substations and special installations Page: 42 of 319
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R-7211-13-2859
In the active seismic zone extending to the northwest from the
Yellowstone Lake area, reverse thrust faulting is prevalent which indicates
that this area is subjected to compressional rather dilational tectonic
effects. Faulting in this region also penetrates to the ground surface. On
this basis a Zone D was defined in which the maximum peak horizontal ground
surface acceleration was considered to be between 0.6 to 0.7 9 over a limited
area with an average peak acceleration of 0.46 g. The maximum and average
peak horizontal ground acceleration in Zones•B and C in this region were
taken to be the same as discussed above for the Oregon and Washington Zones.
It should be noted that ,a more conservative approach to this region would
justify extending these three zones farther to the northwest towards Kalispell
based on the fault structures present.
The maximum and the average peak horizontal ground surface accelera-
tions in the four zones defined have been summarized in Table 2-1 for easy
reference. Scaling values for response spectra will be selected from this
table in later discussions.
TABLE 2-1. SUMMARY OF PEAK HORIZONTAL
GROUND SURFACE ACCELERATION
Seismic
Zone
Peak Horizontal Ground
Surface Acceleration (g)
Maximum
Average
A
0.16
0.12
B
0.32
0.24
C
0.48
0.36
D
0.64
0.48
NORMALIZED RESPONSE SPECTRA
The next step in the study was to define earthquake ground motion
for each seismic risk zone indicated in Figure 2-7 by the use of response
spectra for single degree of freedom oscillators. There are three general
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Couch, R. W. & Deacon, R. J. Procedures and criteria for increasing the earthquake resistance level of electrical substations and special installations, report, September 30, 1973; United States. (https://digital.library.unt.edu/ark:/67531/metadc1101911/m1/42/: accessed March 28, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.