EM induction in spherical earth with non-uniform oceans and continents, and 1D underlying medium-I.

What is it about?

This paper presents basic principles of the iterative-dissipative method (IDM) and main points of its numerical realization. A spherical earth model consisting of a thin non-uniform surface layer being in galvanic contact with an underlying stratified medium is considered. The current system induced by a uniform magnetic field in the model with a realistic distribution of surface conductance is calculated. It is shown that leakage currents are significant even for the earth model with a highly resistive crust and upper mantle. The IDM reduces the system of Maxwell'equations tho and integral equation with a contraction kernel. The equation may be solved by simple iterations, which may always be made convergent.

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Why is it important?

The paper extends the approach first suggested by authors in 1980 publication in Ann. Geophys., v. 36, N2, pp. 127-134 to the model allowing for the currents induced in the world oceans to leak into the structure underlying the sub-surface layer consisting of realistic oceans and continents. The effect of such leakage may be significant.