Resumo

LALINDE, Claudia; GONZALEZ, Adriana  e  CABALLERO, Humberto. PALEOSEISMIC EVIDENCE SOPETRAN FAULT OR SEGMENT 5 SAN JERÓNIMO FAULT. bol.geol. [online]. 2009, vol.31, n.2, pp.23-34. ISSN 0120-0283.

Área Metropolitana did a seismic Hazard study of Barbosa, Girardota, Copacabana, Sabaneta, La Estrella, Caldas y Envigado towns adicional to Studies did in years 1999 and 2002. Solingral, Integral, Inteinsa, Universidad Nacional y Universidad Eafit pool did the study for Área Metropolitana. This work present the paleoseismic evidence found in the road "Conexión Vial Aburrá Cauca" in the south side of the pike site in the west side of the tunnel. This evidence is associated with the Sopetrán Fault or Segment 5 San Jerónimo Fault, wich has 25km lengh. The paleoseismic interpretation identify two seismic events in the last 10.000 years. The oldest is an event of Mw 6.4 magnitude that displaced the last volcanic ash layer between 10.000 and 5.000 years considering that the last volcanic ash layer fallow 10.000 year ago, they appear reworking, it is width and is covered by paleosoil. The most recent event is an event of Mw 6.7 magnitude and displaced the paleosoil which was dated by 1830±40BP C₁₄ so the last event occur in the last 1800 years.

Palavras-chave : Sopetrán Fault; San Jerónimo Fault; Paleoseismicity; Seismic Hazard; Neotectonics.

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