Skip to Main Content
Book Chapter

Introduction

Published:
January 01, 1992

The magnetotelluric (MT) method, pioneered by Tikhonov (1950) and Cagniard (1953), has been applied with varying degrees of success to yield information about the Earth's electrical conductivity, temperature regimes, and geologic structure. The strengths and weaknesses of the MT method are now generally appreciated and the majority of research over the past few years has concentrated on data processing, forward modeling and inversion. Historically, MT interpretation has used one-dimensional (1-D) forward modeling algorithms, 1-D inversions, and 2-D forward modeling. Algorithms for 2-D inversion and 3-D forward modeling are just now reaching maturity.

Although all researchers recognize that the Earth is geologically complicated,1-D inversion is still an important source of information. First, there are geologic regions where the lateral variation is small and therefore a 1-D interpretation is directly applicable. Second, 1-D inverse solutions provide good starting models for 2-D inversion algorithms. Third, a thorough understanding of the 1-D inverse problem, especially the nonuniqueness of the solution, provides a valuable foundation for solving inverse problems in higher dimensions.

Many years ago, some believed that the 1-D inverse problem was adequately solved and that further research would yield few additional benefits. Higher dimensional solutions were thought to be the only remaining frontier. Fortunately, the 1-D problem was further explored, and valuable insight into the nature of the electromagnetic induction problem was developed. For example, the excellent paper by Parker (1980) showed that a conductivity structure producing the least-squares fit to the observations consisted of an infinitely resistive Earth interleaved with a set of infinitely conducting sheets having finite conductance.

You do not currently have access to this article.

Figures & Tables

Contents

Society of Exploration Geophysicists Geophysical Monograph Series

Inversion of Magnetotelluric Data for a One-Dimensional Conductivity

Kenneth P. Whittall
Kenneth P. Whittall
Search for other works by this author on:
Douglas W. Oldenburg
Douglas W. Oldenburg
Search for other works by this author on:
David V. Fitterman
David V. Fitterman
Search for other works by this author on:
Society of Exploration Geophysicists
Volume
5
ISBN electronic:
9780931830563
Publication date:
January 01, 1992

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal