ASDSO Dam Safety Toolbox

Site Response Analysis

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When soil deposits are present at a site and response spectra on top of the soil column are required (rather than or in addition to spectra on rock), then either empirically based approaches and/or analytical procedures can be used to assess the local soil amplification effects. Empirically based approaches rely on recorded ground motion data and resulting empirical relationships for similar soil conditions. Analytical procedures involve modeling the dynamic properties of the soils and using dynamic site response analysis techniques to propagate motions through the soils from the underlying rock. EM 1110-2-6050