Modeling of Earthquake Site Ground Motion Parameters Important for Damage Estimation
The time-dependent earthquake occurrence model of Kiremidjian and Anagnos is combined with a wave propagation model to simulate earthquake ground motions at a site. The time-dependent earthquake occurrences are represented by a Markov renewal process. Ground motion estimates at a site are obtained using the normal mode method. The ground motion forecasts are obtained in various forms including time histories, response spectral values, Fourier spectra, and power spectral densities. When the occurrence and wave propagation models are combined, the seismic risk to a structure over its economic life can be expressed in terms of any of these parameters. Applications to sites in Mexico City subjected to earthquakes along the Middle America Trench indicate that the consideration of seismic gaps is one important feature which is captured and well represented by the time-dependent recurrence model. From the same application it is shown that characteristics of ground motion important for design and damage evaluation, such as peak values, predominant frequencies, and duration are better represented provided the source mechanism can be described reasonably well.
KeywordsAttenuation Subduction Azimuth Trench Remid
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