Landslide Soil Failure Parameters Characterization Using Geoelectrical Resistivity Methods in Uruagu, Nnewi, Anambra State, Nigeria

Electrical Resistivity Imaging (ERI) and Vertical Sounding (VES) were deployed over the Uruagu landslide area. The main purpose of study was to characterize failure parameters in identify soil mechanisms. Ten profiles 2D ERI measuring 200 m each, thirty VES, with three VES along each profile, executed. Nine ten executed within site while one profile a residential street as control profile. Four samples also taken for physical geotechnical laboratory index analysis. PASI resistivity meter used geoelectrical measurements. Wenner-Schlumberger array minimum electrode spacing 10 m. Schlumberger maximum current 130 data analysis involved inversion using RES2DINV software package involving mean model residual construction iso-apparent contour maps. calculated from plotted field on log-log graph then initial models an iterative forward modeling WinResist package. results reveal that subsurface strata are originally composed silty clay values (16.7 – 60.9) Ωm, clayey sand having (116 800) Ωm sandstone layer (>814 Ωm). devastated counteraction material Ωm), colluvia regoliths - 300 variably wet weathered sandstones (<60.9 revealed is majorly sandy clay, pre-landslide existing lithologies. natural water content ranges 10.6% 14.0%. liquid limit 44.0% 46.0%, plastic 15.0% 17.0%, plasticity 28.0% 29.1%. geophysical consistency lithological units agreement characteristic geology has high gully slope gradients collects large volume floods during intense rainy season. These soils, rainfall, imbibe more water, following their slide activate failure.