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Nigeria's free digital learning hub. Videos, lecture notes, practice questions and leaderboards aligned with CCMAS, NBTE, NCCE, WAEC, NECO, IJMB and JAMB curricula.
Instrumentation, field procedure, and data acquisition in electrical methods form the backbone of geophysical surveys aimed at exploring subsurface properties. The instrumentation typically includes a power source to inject current into the ground, electrodes for current transmission and potential measurement, and sensitive recording devices to capture voltage differences. Field procedures involve carefully selecting electrode configurations—such as Wenner, Schlumberger, or dipole-dipole arrays—based on the geological target and survey objectives. Proper electrode placement, grounding, and calibration are crucial to minimize noise and ensure reliable measurements. Data acquisition entails systematically recording resistivity or induced polarization values across survey lines, often aided by modern digital resistivity meters and GPS for spatial accuracy. The collected data is then processed to generate apparent resistivity values, which are interpreted to reveal subsurface structures, aquifers, or mineral deposits. Together, these steps ensure that electrical prospecting provides accurate, reproducible, and meaningful insights into the earth’s hidden layers.
This lecture is part of GPH 312 ELECTRICAL AND ELECTROMAGNETIC PROSPECTING METHODS in the Geophysics department. The course has 30 recorded lectures across 10 series, all free to watch. Read or download the GPH 312 lecture note to study alongside the video.
