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Book Chapter

CHAPTER 5: ELECTROMAGNETIC SOUNDING

By
Brian R. Spies
Brian R. Spies
*
Schlumberger-Doll Research, Old Quarry Road, Ridgefield, CT 06877
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Frank C. Frischknecht
Frank C. Frischknecht
U.S. Geological Survey: deceased
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Published:
January 01, 1991

INTRODUCTION

Electromagnetic soundings are made to determine variations in the electrical conductivity of the earth with depth. Electromagnetic (EM) sounding methods include natural-field methods such as magnetotellurics (MT) as well as high-frequency radiation techniques such as radar probing. This chapter is concerned with controlled-source induction methods of sounding, so-called because an artificial source is used to generate the EM field, and because the frequencies are low enough that the measurement distance is less than the free-space wavelength. This is the quasi-static range, where conduction currents rather than displacement currents predominate. In the following discussing the general term EM sounding will be used for simplicity and to follow convention.

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Contents

Investigations in Geophysics

Electromagnetic Methods in Applied Geophysics: Volume 2, Application, Parts A and B

Society of Exploration Geophysicists
Volume
3
ISBN electronic:
9781560802686
Publication date:
January 01, 1991

GeoRef

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