Estimation of Ground Shaking Distribution Based on Empirical Models and Vs30 Map in Bogota, Colombia

Abstract eng:
In order to develop empirical ground motion prediction equations (GMPEs) applicable to Bogota, Colombia, average shear wave velocity upper 30m (Vs30) -based site amplification model is proposed. The attenuation relation for acceleration response spectra on engineering bedrock developed in Japan is applied to evaluate the observed response spectra at rock sites observed in the 2008 Quetame earthquake. The period-dependent site amplification equations are derived from the Vs30 values at the sites and the spectral ratio of the observed response spectra at surface to the computed response spectra at the engineering bedrock. We confirmed that the developed GMPEs well reproduce the observed response spectra not only for the rock sites but for the soil sites. The Vs30 map in Bogota is developed from the topographic slope-derived Vs30 map by applying the relation between the topographic Vs30 and the measured Vs30. By using the GMPEs and the modified Vs30 map, the distribution of response spectra in Bogota due to an M7.0 scenario earthquake area is estimated.

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