The importance of the shear wave velocity and the predominant period for the evaluation of the site response in Santiago
DOI:
https://doi.org/10.4067/S0718-28132015000100008Keywords:
shear wave velocity, predominant period, site response, equivalent-linear methodAbstract
This article presents the results of a seismic response study of different sites in Santiago conducted with the equivalent linear method. A methodology was developed to determine "equivalent" profiles of Vs up to the predominant impedance contrast (more than 100 m of depth), using shallow measurements of Vs and the predominant period through the Nakamura's technique or HVR. Once the profiles to be analyzed were obtained, the real and the modelled responses were compared for seismic events with Mw ranging from 4.0 to 8.8, yielding to an adequate representation. Finally, a parametric analysis of site response was performed considering the variation of the depth and stratigraphy across the Santiago basin. The trends of the seismic response evidence the importance of using the predominant period alongside the Vs for an adequate dynamic characterization of the studied sites.
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