National seismic hazard maps in Canada and the United States generally provide input ground motions in the form of 2%/50-year response spectra for an assumed 5% of critical damping. This paper presents a practical method to modify 5%-damped response spectra for sites in eastern North America (ENA) to provide response spectra for damping values other than 5%, based on analysis of typical ENA earthquake ground-motion signals over a range of magnitudes and distances.

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