APPLICATION OF QUASI-3D ELECTRICAL RESISTIVITY IMAGING TECHNIQUES TO SITE INVESTIGATIONS IN MOSOGAR ETHIOPE WEST LGA, SOUTH-SOUTH NIGERIA.

The nature of the subsurface was investigated using 2D and 3D electrical resistivity imaging techniques to determine whether it was suitable for the development of engineered structures. The objectives were to determine the Lithostratigraphy and the presence of fractures, voids, clay and overburden soil that may pose a danger to the structure.  A total of six 2D lines were acquired at the site using Petro-zenith Earth resistivity meter. The Wenner array configuration method was adopted for this research. The 2D apparent resistivity data were processed with the RES2DINV program and the results of each surveyed line were collated into a 3D data set and inverted using RES3DINV software. The final results showed that the topsoil of these profiles was inferred to be Laterite, Coarse Sand and clayey sand and the low-resistivity materials at the base in profiles 1,2,3 and profiles 4,5,6 were indicative of the possible presence of Clay therefore it is not suitable for the construction of high rise buildings and Bridges, except it is excavated to remove the suspected clay and filled with the appropriate soil materials before construction.