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amplitude angle apparent resistivity axis body borehole Bouguer anomalies calculated centre chromite coefficients coil conductivity conductor constant correction corresponding deconvolution detector determined dipole direction distance earth electric electrode electromagnetic equation estimate example ferrimagnetic field strength filter flux density frequency geological geophone geophysical gradient gravimeter gravity anomaly ground surface homogeneous horizontal hyperbola imaginary component induced infinite interface interpretation layer loop magnetic field magnetite magnetometer mass measured medium method near-field region normal observed obtained overburden parallelepiped parameters pegmatite permeability perpendicular phase plane plotted polarization porosity positive potential primary field procedure pulse pyrrhotite radioactive ratio real component reflection reflection coefficients reflector remanent rocks sample Schlumberger secondary field Section seismic shot shown in Fig signal sphere survey telluric current thickness thin sheet trace transmitter values variations vector velocity vertical Vibroseis voltage wave zero