INVESTIGATION OF THE INHOMOGENEITY OF THE SUB-SURFACE AT THE VICE-CHANCELLOR’S LODGE

ABSTRACT

A three – dimensional (3D) geoelectrical resistivity imaging study was carried out at the University of Benin Vice-Chancellor’s lodge, Edo State, Nigeria to investigate the inhomogeneity of subsurface employing the grid layout. Using a dipole-dipole electrode configuration with electrode separations of 10m, a series of 2D apparent resistivity data were generated in parallel and perpendicular directions. To create 2D models for each line, the 2D data sets were collected and inverted separately. These models were then combined into 3D data sets and inverted with 3D inversion codes that included smoothness constraint inversion. The images were shown as horizontal depth slices of a block model in both parallel and orthogonal directions The results also revealed that the location studied is made up of lateritic soil, sand, sandstone, shale, limestone, clay, and dolomite, with resistivities ranging from 242 – 19154 ohms-m. The total depth reached was 24.9 m.