Frequency domain and time domain solutions in the magnetotelluric method
Abstract
A controlled magnetotelluric, depth sounding technique was developed in the time domain by way of the theory of eigenfunctions. The use of Maxwell's equations led to a differential equation that was solved by separation of variables. This in turn leads to an eigenvalue problem. Both harmonic and nonharmonic solutions were formulated in terms of eigenvalues. The harmonic solution gave a result that was dependent on frequency. A computer program was developed for the multilayered case of horizontal, isotropic, and homogeneous layers above an infinite half space, model curves of one and two layers thickness, and permeability. The nonharmonic solution resulted in an expression that gave the time derivative of the wave impedance as a function of time.
 Publication:

Ph.D. Thesis
 Pub Date:
 November 1977
 Bibcode:
 1977PhDT........68S
 Keywords:

 Frequencies;
 Magnetic Properties;
 Time;
 Computer Programs;
 Differential Equations;
 Eigenvalues;
 Geophysics