Procedure 4-3 Seismic Design for Vessels

Cs = seismic response coefficient Eh = effect of horizontal earthquake-induced forces Ey, = effect of vertical earthquake-induced forces Fa = short-period site coefficient (at 0.2 second period) 

= long-period site coefficient (at 1.0 second period) 

Sds = design, 5 percent damped, spectral response acceleration parameter at short periods 

Sms = the maximum considered earthquake (risk-targeted), 5 percent damped, spectral response acceleration parameter at short periods adjusted for site class effects 

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