Geophysical Survey of an Area Within Moshood Abiola Polytechnic, Ojeere Campus, Abeokuta, Southwest Nigeria

Geophysical surveys were carried out within Moshood Abiola Polytechnic, Ojeere Campus; situated within the southeastern part of Abeokuta, Southwest Nigeria. It covers about 960 hectares of land bounded by Ogun river to the south which covers the latitudes of 7°5′40′′ and 7°6′0′′N and longitudes 3°19'30''E & 3°20'10'' E respectively; it is within the basement complex area of Ogun state. Eight geophysical techniques such as EM method, Magnetic method, Gravity method, VLF method, SP method, Seismic method, CST and VES were employed along a traverse line with longitudes 7⁰ 5.812 and 7⁰ 5.726 and latitudes 3⁰ 19.568 and 3⁰ 19.525; of about 180m long. This was with the purpose of delineating zones of anomaly which were integrated for the proper delineation of subsurface strata, investigate the nature of the subsurface basement, fracture zones and the estimation of overburden thickness. The geophysical techniques such as CST, Seismic refraction, VLF and VES reveal three to four types of lithologies including topsoil, weathered layer, partially weathered layer, and fractured/fresh basement. The depth to basement was observed to be shallow with ranging from about 8-42m. The geophysical methods reveal some zones of anomaly which are areas of interest for groundwater exploitation, geotechnical foundation investigation, clay deposits investigation and for further research purposes.