Predictive Relations for Significant Durations in Stable Continental Regions

Abstract eng:
Empirical relationships relating ground motion characteristics to earthquake magnitude, site-to-source distance, tectonic setting, and site classification are commonly used in seismic hazard analyses and in seismic design. However, few such predictive relationships have been developed for stable continental regions. In this paper, ground motion parameter predictive relationships for significant durations (i.e., D5-75 and D5-95) are proposed for stable continental regions. The relationships were developed using an up-to-date ground motion database and non-linear mixed-effects regression techniques. The ground motion database consisted of total 620 motions: 28 recorded motions and 592 scaled motions. The latter were scaled using response spectral transfer functions based on a single-corner, point source models (e.g., McGuire et al., 2001; Boore, 1983; Silva and Lee, 1987). The predictive relations for the stable continental regions are compared to the predictive relations similarly developed for active tectonic regions. The comparison showed that the motions in stable continental regions have longer durations at rock sites than those in active seismic regions. However, for soil sites, there was relatively little difference in the significant durations between the two regions.

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