Seismic Factors

This table summarizes the factors that are used in 1997 UBC for seismic design.
Factor Description Location in 1997 UBC
Cv Seismic Coefficient: Table 16-Q   pp.2-34
Ca Seismic Coefficient Table 16-R   pp. 2-35
Ct Construction Factor: moment resisting frames 1630.2.2       pp. 2-14
I Importance: based on the occupancy and function of building Table 16-K   pp. 2-30
Na Near Source factor: zone 4 only Table 16-S   pp. 2-35
Nv Near Source factor: zone 4 only Table 16-T    pp. 2-35
R Structural System factor for Lateral Force Resisting Systems Table 16-N   pp. 2-32
S? Soil profile Types (SA, SB, SC, SD, SE, SF) Table 16-J    pp. 2-30
Z Seismic zone factor Table 16-I
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