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Electromagnetic (EM) survey involving horizontal profiling using ABEM WADI VLF equipment has been employed in prospecting for groundwater occurrence in the Basement complex terrain of Ola-Oluwa local government area of Osun state, southwestern, Nigeria. The qualitative interpretation of the EM data obtained from the survey shows that the amplitude of the filtered and actual real EM anomalies in the study area varies from-79.1% to +0.8% and -2.4% to -37.9% respectively in Ajagba Locality, -26.9% to 47.1% and -42.6% t0 55.4% respectively in Asa locality, -27.9% to -37.0% and -23.3% to 39.0% respectively in Ikonifin locality, 2.1% to 69.8% and -21.5% to -64.5% in Ikire-Ile respectively, In Baramolu locality, the EM readings in most of the recording stations could not be recorded due to high noise level (possibly from the over head power cables) overriding the EM signals. The EM anomalies in the few stations recorded in this locality vary from -0.2% to 44% and -0.3 to 48% respectively. The EM anomalies in all the localities in the study area are generally negative and devoid of any significant peak positive filtered real anomaly typical of subsurface structure. The typically negative EM amplitude anomalies observed in the study area are diagnostic of conductive overburden. The aquifer potential in the study area is generally poor as accumulation of groundwater will be restricted to the overburden layer since the underlying basement layer is generally devoid of subsurface structure.

iosr journal of applied geology and geophysics

Electromagnetic Geophysical Prospecting For Groundwater in Basement Complex Terrain: A Case Study of Ola-Oluwa Area of Osun State, Southwestern Nigeria.