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AEROMAGNETIC SURVEYS AFMAG airborne aircraft alternating current areas array basement boreholes Bouguer Anomaly calculated contours current electrodes Data Processing density depth detector digital computer diurnal downhole Earth's field Earth's magnetic field electrical electromagnetic energy source Equipment and Instruments equipotential lines Figure flux-gate magnetometer frequency gamma gamma-ray Geiger counter Geological Interpretation geophones geophysical exploration geophysical methods Geophysical Service International Geophysicist gradient gravity meter gravity profiles gravity survey Ground magnetic surveys ground surveys high-speed formation horizontal IGS photo induced polarization intervals loop magnetic maps magnetite magnetometer record measured milligal mineral netic oil and gas operations potential electrodes proton magnetometer pulse radiometric receiver coil reconnaissance reflected and refracted refracted waves residual gravity maps rock formations rubidium scintillation counter sedimentary seismic reflection seismic waves Self-potential shallow shot-point signal sparker speeds of seismic structures sulphide orebody surface tape telluric telluric currents time-section towed transmitter traverses variations vertical component Vibroseis voltage Zeeman sublevels