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Abstract
An integrated geophysical survey involving very low-frequency electromagnetic (VLF–EM) and the dipole-dipole electrical resistivity methods was carried out along the Auchi-Ibillo road in Igarra, Nigeria with a view to examining factors responsible for road failures in the area. Analysis of very low frequency electromagnetic current density sections and dipole-dipole pseudo-sections were made along three traverses. The (VLF–EM) revealed the presence of conductive zones and the dipole-dipole pseudo-sections delineated low resistivity clay enriched, water absorbing sections and a linear fracture zone or joint. The delineated clay section and the fracture zone are the major geologic factors responsible for road failures in the area. Key words: Electromagnetic, resistivity, Igarra, Nigeria, geologic factor, road failure.
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