A geophysical site investigation in the basement complex of Akure southwestern Nigeria

Geophysical investigation involving Schlumberger Resistivity Sounding has been carried out to provide information on the subsurface conditions in terms of the lithological characteristics, geologic structures and the groundwater vulnerability to surface infiltration. A total of thirty-six (36) Vertical Electrical Sounding (VES) stations were occupied within the study site. Four subsurface geologic layers were delineated within the study area; the topsoil (sand, silt and clay), the weathered layer (comprising of clay, clayey sand / sandy clay/ laterite), the weathered / fractured basement and the basement. Also, within the weathered layer is the clay protective layer overlying the weathered / fractured basement that serving as cover for the major aquifer unit. Groundwater development is feasible through the use of tube wells as such are protected from surface infiltration.