Comparative Analysis of Dipole-Dipole and Wenner-Schlumberger Array of Electrical Resistivity Tomography in Mapping Subsuface Geological Features of Gindin Akwati, Jos, Plateau State

The comparative analysis between Dipole-dipole and wenner-schlumberger array of electrical resistivity tomography in mapping subsurface geological features were carried out at gindin akwati town Jos north central, Nigeria. The aim of the study is to determine the weakness and suitability of the different arrays for qualitative and quantitative subsurface stratigraphic delineation of geological features in the study area. The result of the electrical resistivity tomography from the different arrays were interpreted base on the depth of penetration, data coverage, resolution and sensitivity in mapping vertical and horizontal structures of the subsurface. The depth of penetration for the wenner-schlumberger ranges from 36.9 m to 9.4 m and that of dipole-dipole ranges from 28.7 m to 29.5 m for the same spread length. The result show that the wenner-schlumberger array has higher resolution, accurate depth of penetration, higher depth of penetration and good mapping of the horizontal geological structure of the subsurface than the dipole-dipole array for the same profile spread length. The result of the dipole-dipole array was found to have wider horizontal data coverage, more sensitive to horizontal resistivity changes and good in mapping vertical geological structures for the same spread length. Thus, the wenner-schlumberger array is recommended for mapping deeper horizontal structures while the dipole-dipole array is good for near vertical structures of the subsurface geological features.