AbstractThis study not only attempts to justify an equivalent stationary motion model, but also endeavours to illustrate its potentials as an attractive analysis tool. Using 38 ground accelerations recorded on rock sites as data base, this study first demonstrates that the equivalent stationary motions do give average response spectra compatible with real records. This study also shows that through the equivalent stationary model, a set of motions may be defined by specifying the joint distributions of the model parameters. Finally, by converting a relationship between earthquake magnitude and liquefaction potentials of ground motions, this study has derived normalized magnitude‐dependent response spectra for rock site
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