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. The purpose of this work was to study the surroundings of a landfill in the Formosa city, Goi´as state, central Brazil, with respect to the values of the soil electrical resistivity. In the study area, two geophysical surveys were conducted, respectively in 2012 January and May. These studies were executed in the northwest edge of the landfill, which has smaller altimetry and therefore is the preferred site for effluents migration. The resistivity variation in the study area between the two data acquisition periods showed an average increase of approximately 47% in the value of this property in the transition from the rainy to the dry season. Independent of variation derived from the seasonal aspects of precipitation, there were observed areas with high and low resistivity along the survey line and whose positions are the same in both periods. The reasons for the occurrence of these areas are related to surface water runoff, which transports material in solution from landfill, including nearby roads, to its slope. Keywords: geophysical survey, effluent migration, surface water runoff. RESUMO. O objetivo deste trabalho foi estudar o entorno do Aterro Sanitario de Formosa, estado de Goias, Brasil, mais especificamente sua borda noroeste, no que diz respeito aos valores da resistividade eletrica do solo. Na area de estudo foram realizados dois levantamentos geofisicos, respectivamente em janeiro e maio de 2012. Estes levantamentos foram executados na regiao noroeste do aterro, a qual apresenta as menores cotas e, portanto, e o local preferencial para migracao de efluentes. A variacao da resistividade na area de estudo entre os dois periodos de aquisicao de dados mostrou que em media ocorreu um aumento de aproximadamente 47% no valor desta propriedade na passagem da estacao chuvosa para a de seca. Independente da variacao derivada dos aspectos sazonais de precipitacao observaram-se, nos periodos de levantamento, areas com alta e baixa resistividade ao longo da linha de aquisicao de dados e cujas posicoes sao coincidentes nos dois periodos. A justificativa para a ocorrencia destas zonas esta vinculada ao escoamento superficial de agua, a qual, ao escoar na area do aterro, inclusive pelas estradas ali existentes, transporta material em solucao que tende a se acumular no seu talude. Palavras-chave: levantamentos geofisicos, migracao de efluente, escoamento superficial.

SOIL ELECTRICAL RESISTIVITY MAPPING IN THE FORMOSA CITY LANDFILL, GOIÁS STATE, BRAZIL