Resumo

SAGRIPANTI, Guillermo L; VILLALBA, Diego  e  VILLEGAS, Mónica B. Nuevas evidencias de deformaciones cuaternarias asociadas a la falla Sierra chica, Sierras pampeanas de Córdoba. Rev. Asoc. Geol. Argent. [online]. 2012, vol.69, n.4, pp.611-626. ISSN 0004-4822.

In the argentinean intraplate, between the 31º 45' and 32º 45' of latitude S, in the western front of the Sierra Chica, Sierras Pampeanas of Cordoba, the presence of superficial morphology and deformations in quaternary sediments allow to deduce that the Neogene tectonic activity in the region, had continuity in the Holocene and probably it has had the occurrence associate of paleoearthquakes. The objectives of the present contribution are presents new evidences of quaternary deformations associated with the Sierra Chica fault, to extend his trace towards the south in the plain and to do a preliminary estimation of the seismogenic potential associated with this structure. Seven transverse profiles were relieved to the trace of a secondary fault of the principal uplift front of the Sierra Chica. They present the Precambrian crystalline basement, conglomerate and not cohesive quaternary sediments deposits affected by ductile and fragile deformations corresponding to reactivations during of Pleistocene and Holocene of the structure. The obtained results have allowed to extend the trace of the fault towards the S in the plain up to the Tegua creek, to relieve structures deformacionales in thin sediments not was reported up to the present and to estimate the maximum magnitude of a future earthquake, between Ms 6,7-7,5, and Mw=7,5 associated with the Sierra Chica fault.

Palavras-chave : Fault; Seismogenic potential; Trench; Paleomagnitude; Paleoearthquakes.

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