Girón-Lozano, L.V., Salcedo-Hurtado, E. de J. and Pérez-Alcázar, G.A. 2020. Spectral analysis of earthquake of august 27, 2013 occurred in the Valley of Cauca, Colombia. Boletín de Geología. 42, 2 (May 2020), 49–67. DOI:https://doi.org/10.18273/revbol.v42n2-2020003.