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ABSTRACT
Gully erosion poses a significant environmental challenge in many regions worldwide, including the Uteh area of Benin City, Nigeria. Understanding the subsurface characteristics of gully-prone areas is crucial for effective erosion control and mitigation strategies. This study employs the Multichannel Analysis of Surface Waves (MASW) geophysical method to investigate the subsurface properties of gully-affected sites in Uteh, Benin City. The MASW method involves generating seismic waves at the surface and analyzing their dispersion characteristics to infer subsurface properties such as shear wave velocity (Vs) and soil layer thickness. Field data collection for three traverses involved the deployment of a geophone array and a sledgehammer source for seismic wave generation. The acquired dispersion curves were inverted to obtain Vs profiles for various locations within the study area. Preliminary findings reveal significant variations in Vs values across the gully-affected sites, indicating heterogeneity in subsurface materials. The results shows that the shear wave velocity reveals saturated shale and clays, dry sand, and wet sand. This shows the susceptibility of the area to gully erosion due to incompetent soil,structures.
