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Localization of Neotectonic Activity with the LANDSAT Images in La Laja (San Juan, Argentina),
CENTRO REGIONAL DE AGUA SUBTERRANEA SAN JUAN (ARGENTINA)
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The purpose of the present study was the localization of zones with of neotectonic activity in areas with intense asismicity in San Juan province Central Western Argentina. The locality of La Laja, lying at about 25 km to the North of San Juan city, was choosed as a pilot area. Landsat images and air photographs wew the main material used for the investigation, the results of which werw checked in the field and with aerial reconnaissance. It was possible to map separately Quaternary and Pre Quaternary rock units in the images, as well as the alignments present in the former sediments. These linears were checked in the field and with flights done in hours when the sun was close to the horizon. In some cases the neotectonical indicatione could be measured. Moreover, more than 90 of the alignments detected in the images were confirmed in the field. The method used permit the quick detection of neotectonical phenonmena with low costs, since interesting point over a wide area could be localized in images and air photographs, and, thus, time consuming and costly field reconnaissance trips could be spared.
APPROVED FOR PUBLIC RELEASE