Dictionary:Remote (reference) magnetotelluric method

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Magnetotelluric survey conducted with either an electric field or magnetic field reference located a few kilometers from the point of measurement. The reference is used to obtain a better estimate of the true impedance tensor Z by using the average crosspower between the reference fields and the electric and magnetic fields at the sounding location. In contrast to conventional magnetotellurics, the impedance estimate will be unbiased by noise power, provided the noise in the reference signal is uncorrelated with noise in the electric and magnetic channels. See magnetotelluric method and Gamble et al. (1979).