2D MODELLING OF THE SEISMIC RESPONSE FOR BARQUISIMETO AND CABUDARE CITIES FOR MICROZONATION STUDIES

Abstract

The preliminary results of the 2D superficial seismic wave modeling along four cross sections through the Barquisimeto and Cabudare cities are presented. The 2D modeling was done using a technique that combines an analytical method (modal summation) with a numerical method (finite difference) in order to obtain the seismic response in terms of synthetic seismograms generation. We used two seismic scenarios with magnitude 6.0 and 7.0 Mw. The 2D/1D spectra ratio shows the vertical component of the acceleration with an amplification factor 6, around 2 Hz; whereas the horizontal components have amplification of factor 2, around 1 Hz. We also observed an increase in amplitude and duration of the seismic signal at the edge of the sedimentary basin.