Article | REF: D3073 V1

Modeling Earth Networks by Equivalent Electric Circuits. Theory

Authors: James ROUDET, Édith CLAVEL, Jean-Michel GUICHON, Patrice JOYEUX

Publication date: November 10, 2018

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1. Phenomenological approach

The aim of this first section is to present the principle of the method developed for the simple case of a point current injection at the earth's surface.

1.1 Basics of conduction in the earth

Earth is a conductive medium whose equivalent resistivity ranges from 10 Ωm to over 1,000 Ωm for very rocky terrain. This physical property makes it possible to use this medium as a natural conduction element linking several distant sources. Despite its resistivity, which remains high, the volume involved can easily transform this conductor of mediocre resistivity into a "good" conductor.

As with any physical system, this problem is governed by Maxwell's equations [equations (1)...

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