Resumo

GIRON-LOZANO, Lina Vanessa; SALCEDO-HURTADO, Elkin de Jesús  e  PEREZ-ALCAZAR, Germán. Spectral analysis of earthquake of august 27, 2013 occurred in the Valley of Cauca, Colombia. Bol. geol. [online]. 2020, vol.42, n.2, pp.49-67.  Epub 28-Maio-2020. ISSN 0120-0283.  https://doi.org/10.18273/revbol.v42n2-2020003.

This research determines the frequency content for the earthquake of august 27, 2013 with an epicenter in the county seat of Restrepo in the department of Valle del Cauca, Colombia, recorded by the Colombian Geological Service and Seismological Observatory and Geophysical Colombian Southwest. The treatment step comprises spectral analysis through the deconvolution process that depends on the composition of the instrumental seismological station, the calculation of the spectrogram that describes the time evolution of the frequency content and dynamic range in units of decibels (dB) and the Fourier transform. Then the ratio of frequency content with the geology of the area where seismic stations are located is determined. It is established that although high periods are described in the signal received in each of the stations, the temporal evolution of the seismic waves shows that the frequencies found in the Fourier spectra are variable and depend on the geological conditions but not on the instrumental parameters, so that soil deposits behave as filters for high frequency energy.

Palavras-chave : Earthquakes; Spectral analysis; Deconvolution; Fourier transform; Spectrogram; Frequency content.

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