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Between 27° S and 33° S the Andean backarc is one of the most seismically active region in the world, being epicenter of the most important crustal earthquakes that affected Argentina. Associated with the seismicity an intense deformation occurs, causing changes on the land surface morphology. In the western sector of the Sierras Pampeanas Occidentales, in the Sierra de la Huerta, a GIS analysis was applied to define geomorphological units and obtain qualitative and quantitative parameters that allowed characterizing the identified geoforms and their relation with tectonic activity. Andean tectonics affect this region for the last 5 millions of years, controlling it landscape evolution. Three morphostructural units and quaternary active faulting were identify, presenting abundant morphotectonic markers, such as dislocated alluvial levels, changes in river pattern, diversion of river courses, increasing degree of incision, water springs, wind gap and inversion of the pattern drainage, among others. The quantitative and qualitative analysis of the morphotectonic parameters shows that deformation decrease from North to South and increase from East to West. Concluding, according to morphotectonics parameters deformation is still active, modifying the present-day landscape in the Western piedmont of La Huerta range.

ANÁLISIS MORFOTECTÓNICO EN EL PIEDEMONTE SUROCCIDENTAL DEL ANTEPAIS ANDINO, SIERRAS PAMPEANAS OCCIDENTALES, SAN JUAN, ARGENTINA