Article | REF: C224 V1

Geophysics applied to civil engineering

Author: Richard LAGABRIELLE

Publication date: May 10, 2007

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7. Electromagnetic methods

7.1 Basic principle

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7.1.1 General

There are two main types of electromagnetic method, depending on the frequency f of variation of the electromagnetic field observed.

First, we define the characteristic frequency : fc=12πσε=12π1ρε=18109ρεr

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Electromagnetic methods