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. This work involved geophysical prospecting techniques, remote sensing and litho-structural recognition, applied to groundwater research in a region formed by hard rocks located in Iraucuba, Ceara State, Brazil. Geophysical magnetic and electromagnetic airborne data compiled from PROASNE project (Projeto Agua Subterrânea do Nordeste do Brasil ), Landsat ETM7 satellite images and electromagnetic land data, acquired in this research, were studied and allowed mapping lineaments related to geological structures, properly characterized by structural recognition on the field. The integrated analysis of geophysical and geological data, including hydrogeological information from deep wells, allowed understanding the pattern of fractures in the area, correlating the structures with the geological event responsible for their genesis and determining their hydrogeological potential. The results culminated in a structural-hydrogeological local model to be applied in areas with similar geological features. According to this model, geological brittle structures with approximate N-S direction are little penetrative and contribute to the recharge structures of WNW-ESE direction, which are the most promising for groundwater exploitation through deep wells. Keywords : groundwater in hard rocks, geophysics prospection, remote sensing. RESUMO. Este trabalho envolveu tecnicas geofisicas de prospeccao, sensoriamento remoto e reconhecimento lito-estrutural, aplicados a pesquisa de agua subterrânea em uma regiao formada por rochas cristalinas, localizada no municipio de Iracuba, Estado do Ceara, Brasil. Dados geofisicos magneticos e eletromagneticos aerotransportados compilados do projeto PROASNE (Projeto Agua Subterrânea do Nordeste do Brasil), imagens do satelite LandSat ETM7 e dados eletromagn´eticos terrestres, adquiridos nesta pesquisa, foram trabalhados de forma integrada e permitiram cartografar lineamentos referentes a estruturas geol´ogicas diversas, devidamente caracterizados atraves de reconhecimento estrutural em atividade de campo. A analise integrada dos dados geofisicos e geologicos, incluindo informacoes hidrogeologicas de pocos profundos, possibilitou compreender o padrao de fraturas da area, correlacionar as estruturas com o evento geologico responsavel por sua genese e determinar o potencial hidrogeologico destas estruturas. Os resultados obtidos culminaram em um modelo estrutural-hidrogeologico local, de aplicacao em areas com caracteristicas geologicas similares. De acordo com o referido modelo, estruturas geologicas rupteis de direcao aproximada N-S sao pouco penetrativas e tem como funcao principal contribuir com a recarga das estruturas de direcao WNW-ESE, que sao mais promissoras a explotacao de agua subterrânea por meio de poco tubular profundo. Palavras-chave: aquifero fissural, geofisica de prospeccao, sensoriamento remoto.

AIRBORNE AND GROUND GEOPHYSICS APPLIED TO GROUNDWATER PROSPECTION IN HARD ROCKS IN IRAUÇUBA, CEARÁ STATE, BRAZIL