CONTRIBUTION OF CHARACTERISTIC FREQUENCIES TO THE DOMINANT VIBRATION PERIOD IN QUERÉTARO CITY, MEXICO
DOI:
https://doi.org/10.18867/ris.97.482Abstract
This study presents a methodology developed to evaluate the contribution of the characteristic frequency of each layer to the fundamental period of vibration from the inversion of apparent dispersion curves obtained from a surface-wave survey using an active source, independent of the velocity of each layer. The calculation of the fundamental period was achieved using the simplified procedure developed by Dobry et al. (1976) for a linear soil profile. For the classification of shear-wave velocities, a modification of the International Building Code (IBC, 2009) was used for the subsoil material in the city of Querétaro. The main geological units were grouped into three stratigraphic sequences: the plateau volcanic rocks that constitutes the high topographic elevations that surround the valley, the slope deposits composed of volcanic and sedimentary deposits (alluvial), and the plain sequence comprised of stratified deposits of lacustrine, fluvial and volcanic materials. From the analysis of the shear-wave velocity profiles, we observed layers with low shear velocities confined within high shear-velocity strata, indicating the presence of low stiffness layers at different depths. For the rock sequences, the fundamental period of vibration is short (less than 0.1 s), while this period is longer (greater than 0.3 s) in the plain deposits. In the slope area, the period is relatively long (variable from 0.1 s to 0.3 s) possibly due to a topographic effect. The results obtained in this study show that the methodology proposed to evaluate the dominant period from the integration of the characteristic frequencies obtained with surface waves, allows us to estimate the thicknesses and shear velocities of each layer, the fundamental period of each stratigraphic sequence and finally, their site spectra.Downloads
References
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