The city of Ouro Preto is on a morphologically rugged terrain due to its lithological and structural complexity. The lack of planning during its occupation since the gold cycle in the eighteenth century resulted in a concentration of residences built in places of high geotechnical instability. Currently, catastrophic events with loss of assets and lives have been common, especially during rainy periods. In this work, in agreement with the Civil Defense, an area which is very populated and prone to high geotechnical risk was selected as a pilot area. In an effort to minimize these potential losses, this study aims to understand and delimit areas of greatest risk, so that the population is aware and the competent authorities may take the appropriate mitigative measures. The study consists in reviewing, processing and analyzing geological, geotechnical and geophysical data existing in the area, to characterize areas for further detail studies. The detailing consists of aerophotogrammetry, terrestrial magnetometry and electroresistivity to determine underground structures in the area, in addition to a more detailed geotechnical classification.

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