The authors are to be commended for presenting clear and practical solutions to a problem that has long been vexing to engineers and seismologists—how to link probabilistic assessments of ground-motion hazard with the results of geotechnical ground-response analysis. The term “ground- response analysis” is used here to refer to one-dimensional modeling of shear-wave propagation through a soil column, the response of which will generally be nonlinear for engineering design applications. The purpose of this discussion is to point out some of the key assumptions made in the development of the authors’ solution and to offer a preliminary comparison with an...

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