Dictionary:Magnetic induced polarization (MIP)

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A method of IP surveying involving measurement of the transient magnetic (rather than electric) field caused by galvanic currents. Involves measuring the normalized primary magnetic field HN,

HN=HP/HPʹ,


where HP is the steady-state magnetic field amplitude measured at a single transmitter frequency, HPʹ is the value calculated for uniform ground, and the magnetometric resistivity (MMR),

MMR=(HPHP0)/HP0,


where HP0 is the predicted uniform-ground primary field at the midpoint between the current electrodes. The magnetic fields are in the picotesla range and require a very sensitive low-noise magnetometer for their measurement. See Seigel and Howland-Rose (1983).