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A geophysical investigation involving the electrical resistivity and gravity methods was carried out within the premises of a Beverage Factory in Edo State. The investigation was to enable the determination of the cause(s) of a ground subsidence within the premises of the boilers. The vertical electrical sounding interpretation results show that the premises is underlain by sands with intercalation of clay/sandy clay in places. The layers show lateral continuity. The residual gravity anomalies are generally flat indicating near homogeneous subsurface sequence devoid of lateral discontinuities such as sinkholes/ cavities or faults. A synthesis of the results show that the ground subsidence is not precipitated by collapsed geologic feature such as sinkholes/ cavities but boiler load induced differential settlement arising from near surface incompetent (clayey) substratum, in the premises of the boilers. KEY WORDS: Ground subsidence, Vertical electrical sounding, Gravity anomalies, and Incompetent substratum. Global Jnl Geological Sciences . Vol.2(1) 2004: 153-160 |
