Applied Geophysics

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Applied Geophysics

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    Analysis of Electrical Resistivity Survey Data for Aquifer Potential and Protective Capacity at Mararaba Dan-Daudu Minna, North Central, Nigeria
    (Science Publishing Group, 2023-10-28) Alfa Idris Alhaji; Salako Kazeem Adeyinka; Rafiu Abdulwaheed Adewuyi; Udensi Emmanuel Emeka; Adetona Abbas Adebayo; Jamilu Shehu
    It is a fact that basement complex regions lacks sufficient overburden that can host sustainable water table, water bearing fractured/weathered rocks referred to as aquifers are usually identified via suitable geophysical methods to proffer solution to water challenges within these regions. This current study targets the exploration of groundwater potential within the Mararaba Dan-daudu community, a suburb of Minna metropolis. Electrical resistivity method was employed to delineate aquifer prospects and their protective capacity within the area of study. The data from thirty-six Vertical Electrical Sounding (VES) survey points were acquired and analysed. Survey points were aligned along six profiles (A – F) with six VES points per profile. Interpretation of VES points along profiles was helpful in determining the number of layers and thickness. The analysis revealed mainly three layers comprising of sand and fresh laterite at the first layer, fractured/weathered basement at the second layer and fresh basement at the third layer. Iso-resistivity mapping was also done at various depths (surface, 5 m, 10 m, 15 m, 20 m, 30 m and 40 m) respectively to investigate the lateral variations of resistivity over a horizontal plane. These showcased the electrical conductance sliced at the depths of interest. Thirteen VES points (A1, A5, A6, B1, B3, B6, C6, D6, E6, F1, F2, F4 and F5) were mapped as having good prospective aquifer properties. Longitudinal conductance was computed for the outlined VES points to determine their Aquifer Protective Capacity (APC). The result of (APC) rating for the 13 VES revealed the frequency and percentage of APC ranged as: 2 VES locations (15.4%) have good APC, 8 VES locations (61.5%) have moderate APC and 3 VES location (23.1%) have weak APC. with only 3 VES locations out of 13 VES locations in the study area revealed weak APC, the results proved that the groundwater potential of the study area has moderately good APC.
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    GEOELECTRICAL INVESTIGATION FOR GROUNDWATER AT DAY SECONDARY SCHOOL, KAMPALA, MINNA, NIGER STATE, NIGERIA
    (Nigerian Journal of Physics 2018, 2018) ADETONA, Adebayo Abbass, Damidami Luka
    Geoelectrical investigation of groundwater has been carried out at Day Secondary School, Kampala, Minna, Niger state, Nigeria. The area is situated on Latitude 9⁰40'37.11'' to 9⁰41'37.1''N and longitude 6⁰29'52.64'' to 6⁰30'51.56'' E. The survey was carried out with the aim of delineating the potential area for groundwater development and locating possible and suitable sites for productive boreholes, via overburden thickness and depth to the groundwater within the study area. A total of 500 m x 500 m was covered with VES points at 100 m interval and inter profile space of 100 m giving a total of thirty six (36) VES points. The schlumberger configuration was used for data collection with half-current electrode (AB/2) ranging from 1 to 100 m. WinResist computer software package was used to produce the VES curves. The quantitative interpretation of the VES curves made use of curve matching and computer aided approach. The depth sounding interpretation results were used to generate geoelectric section. The corresponding geologic section were also generated which revealed the existence of three subsurface layers. These layers comprises the topsoil, weathered/fractured basement and fresh basement The depth to basement map was also produced to further indicate depth to basement from the ground surface with VES A2, B5, D2 and E1 to be relatively deeper with depth values range between 25 to 35 m while the shallower region of the area has a depth range values between 10 to 20 m. Hence, VES A2, A5, B4, B5, C2, C4, D4, D5, E1, E3, and F4 are high conductive zone which are prolific for ground water potential. The depth range of the aquifer potential zones is between 22.7 m to 50.4 m. Correlations of the geologic sections extracted from the geoelectric section with the interpreted nearby borehole log were in agreement.