Abstract

Introduction: This technical paper will demonstrate the importance of subsurface characterization for engineering purposes such as construction and road failure. Aims: Geoelectrical method was deployed at Fountain University located at Oshogbo, Osun state with the aim of characterizing the subsurface geological layers within the premises. Materials and Methods: Seventeen (17) VES were acquired with PASI 16-GL along three 100-meter traverses. Electrical resistivity data was plotted on a log-log graph, curve matched and subjected to computer iteration software. Results: The interpreted results showed that the entire region generally consists of four to five sublayers; topsoil with resistivity values ranging between 27.5 Ωm and 967.1 Ωm at maximum depth of 0.9 m beneath the earth surface, weathered layer with resistivity values ranging between 60.8 Ωm and 505.1 Ωm at a maximum depth of 15.8 m and partly weathered layer with resistivity values ranging from 150.8 Ωm – 1130.0 Ωm at maximum depth of 26.9 m beneath the earth surface, clay with resistivity values ranging between 4.0 Ωm and 42 Ωm at maximum depth of 16.9 m beneath the earth surface, fractured basement with resistivity values ranging between 103 Ωm – 460.0 Ωm at maximum depth of 92.6 m and fresh basement with resistivity values ranging from 931 Ωm – 5432.0 Ωm. Conclusion: This study can be used as a reconnaissance material for groundwater, engineering, and environmental purposes in the surveyed area, it can also serve as a template in other similar terrain.

Keywords: Geoelectrical method, Vertical electrical resistivity, Traverse, Subsurface layers, and Fountain University