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Contribution of Deep Deposits to Estimate Site Effects in the East of Mexico City
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 24th European Meeting of Environmental and Engineering Geophysics, Sep 2018, Volume 2018, p.1 - 5
Abstract
The damages in Mexico City (CDMX) associated with September’s 1985 and 2017 earthquakes are symbolic cases of the modifications that local geology can impose to strong ground motions received by buildings in Mexico’s basin. Site effects within the CDMX are predicted considering a simplified unidimensional model, in which the amplifications of the movement are generated by a high contrast of acoustic impedance between a homogenous layer and a semi-space. In this study we advance in the discussion of the origin of the amplification within Mexico City by including the observation of shear velocity models at the east of the city, which indicates the absence of a high contrast of shear velocity in the area, even when the deep deposit formation was reached. Results show a contribution of underlying formations to the superficial deposits in the observed dominant period; this suggests that site effects are probably associated to greater shear velocity structure thicknesses, than soil thickness over deep deposits.