Page Comparison

...

F_a = Short-Period Site Coefficient
F_v = Long-Period Site Coefficient for a period of 1.0 seconds
S_MS = Short-period design spectral response acceleration parameter [dimensionless]
S_M1 = Design spectral response acceleration parameter for a period of 1.0 seconds [dimensionless]
S_S = the mapped MCER spectral response acceleration parameter at short periods as determined in accordance with Section 11.4.2,
S₁ = the mapped MCER spectral response acceleration parameter at a period of 1 s as determined in accordance with Section 11.4.2 seconds
S_D1 = Design spectral response acceleration parameter for a period of 1.0 seconds
S_DS = Design earthquake spectral response acceleration parameters at short periods
T = Natural vibration period [s]
T₀ =Horizontal elastic design acceleration spectrum corner period [s]
T_S   = Horizontal elastic design acceleration spectrum corner period [s]
T_L = Transition period to constant displacement region in horizontal elastic design spectrum [s]
S_a = Horizontal elastic design spectral acceleration [ g]

...