Resumo

QUINDE, Pablo  e  REINOSO, Eduardo. Subsoil Characteristics of Mexico City, Aceleration and hysteretic energy spectra for the Mexico Earthquake of September 19, 2017. Geofís. Intl [online]. 2020, vol.59, n.4, pp.234-256.  Epub 28-Nov-2022. ISSN 2954-436X.  https://doi.org/10.22201/igeof.00167169p.2020.59.4.1892.

The September 19, 2017, intraslab earthquake (Mw7.1), whose epicenter was located near the limits between the states of Puebla and Morelos at approximately 120km from Mexico City, caused severe damage in these regions. This article analyzes the spectral ratios of accelerometric stations in the lake-bed of Mexico City with respect to the average Fourier spectra at hill zone sites in order to study and compare over time the changes in the behavior of local effects and their relationship with the damage presented during this earthquake. These ratios also exhibit the settlement problem in some places in the city due to overexploiting the aquifer for water supply purposes, where changes in soil periods, even larger than 40%, are seen. Finally, pseudoacceleration and hysteretic energy maps for Mexico City with a discussion with a possible correlation with reported damages are presented.

Palavras-chave : Spectra ratios; pseudoacceleration demands; hysteretic energy demands; Fourier spectra; Mexico earthquake; spectral amplifications.

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