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This paper aims to present evidence of neotectonic activity on the eastern piedmont of Cordillera Frontal, Central Andes, Argentina. The geomorphology of the region is complex, resulting of the interaction between sedimentary, climatic and tectonic processes, prevailing in the piedmonts of the main mountain ranges, alluvial fans systems which were deposited during the Pleistocene. The morphology of alluvial systems have been modified by the tectonic activity related to the Colanguil Fault System (CFS) that resulted in anomalies in the drainage network and a set of Quaternary favor-counter slope scarps affecting several alluvial levels. Thus, four alluvial levels were differentiated; being Q 1 the most recent and coincident with existing drainage channels and Q 4 the oldest, topographically highest and less preserved. Two natural exposures, called in this work Trench I and Trench II, which allowed knowing the kinematics of the faults and the affected deposits, were identified in the southern section of the Colanguil Fault System (SFC). The paleoseismological analysis suggests the occurrence of at least two seismic events in the area, implying that the last event have less than ~37,000 years. Finally, the occurrence of a third event during the Holocene may be not ruled out.

ANÁLISIS NEOTECTÓNICO EN EL PIEDEMONTE ORIENTAL DE CORDILLERA FRONTAL, ANDES CENTRALES. SAN JUAN, ARGENTINA