Parámetros del terremoto del 05 febrero de 1938 en la región del Eje Cafetero-Colombia a partir de datos macrosísmicos

Abstract

A historical earthquake ocurred in Colombia on February 5, 1938 in the Eje Cafetero zone. Macrosismic analysis methods are applied from isoseismal curves, to determine the main seismological parameters of this earthquake. The results indicate that the normal macrosismic epicenter (E n ) is located at ϕ = 5.102° N; λ = 75.603° W. The normal depth of focus h n = 62.9 ± 1.44 km was identified. The magnitude and seismic energy released were calculated by applying existing equations in the literature, obtaining M6.2 and M L 6.2. The seismic energy released is E = 1.37*10 23  erg. The scalar seismic moment M 0 = 2.74*10 27 dynes-cm and the respective seismic moment magnitude Mw = 7.6 were evaluated. Finally, the magnitude of surface waves Ms = 6.7 was calculated and 0.15 g in the seismic acceleration.