"3-D modeling and inversion is a reality, and not an illusion." This is the clear conclusion of the Second International Symposium on Three-Dimensional Electromagnetics held at the University of Utah in 1999. Containing papers submitted by 36 authors, this volume, by the sheer number of works, their diversity, and the truly international character of the efforts attests to the vigor with which the problems of the field are pursued today.

The papers in this book are grouped in three parts: 3-D EM modeling; 3-D EM inversion; and 3-D EM in practice. They cover a wide range of topics in forward modeling and inversion based on new fast approximate approaches and new efficient solutions by integral equation, finite difference and finite elements techniques. If the 1980s were the decade of rapid development in 3D seismics, the 1990s became the decade of growing interest of practical geophysicists in 3D EM modeling and inversion methods.

The contributions contained in this volume represent a snapshot of today's state-of-the-art in three-dimensional electromagnetics.

Table of Contents

Preface. Part I. 3-D EM modeling. 1. An integral equation solution to the geophysical electromagnetic forward-modeling problem (C.G. Farquharson, D.W. Oldenburg). 2. Compression in 3-D integral equation modeling (M.S. Zhdanov, O. Portniaguine, G. Hursan). 3. Modeling electromagnetic fields in a 3-D spherical earth using a fast integral equation approach (A. Kuvshinov, D. Avdeev, O. Pankratov, S. Golyshev). 4. Modeling induction log responses in 3-D geometries using fast integral equation approach (D. Avdeev, A. Kuvshinov, O. Pankratov, G.A. Newman, B. Rudyak). 5. Nonlinear approximations for electromagnetic scattering from electrical and magnetic inhomogeneities (A. Cheryauka, M.S. Zhdanov, M. Sato). 6. Three-dimensional modeling considering the topography for the case of time-domain electromagnetic method (M. Endo, K. Noguchi). 7. Reduced-order modeling of transient diffusive electromagnetic fields (R.F. Remis, P.M. Van den Berg). Part II. 3-D EM inversion. 8. Three-dimensional magnetotelluric modeling and inversion: application to sub-salt imaging (G.A. Newman, G.M. Hoversten, D.L. Alumbaugh). 9. 2-D inversion of frequency-domain EM data caused by a 3-D source (Y. Mitsuhata, T. Uchida). 10. 3-D focusing inversion of CSAMT Data (O. Portniaguine, M.S. Zhdanov). 11. SGILD EM modeling and inversion using magnetic field equations (Ganquan Xie, Jianhua Li, Chien-Chang Lin). 12. Application of a non-orthogonal coordinate system to inverse single-well electromagnetic logging problem (A. Abubakar, P.M. Van den Berg). Part III. 3-D EM in practice. 13. Decomposition of three dimensional magnetotelluric data (X. Garcia, A.G. Jones). 14. On the determination of the electrical 3-D conductivity distribution beneath Iceland with


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About the editors

Michael Zhdanov

Michael S. Zhdanov is Professor of Geophysics and Director of the Consortium for Electromagnetic Modeling and Inversion (CEMI) at the University of Utah in Salt Lake City. Dr. Zhdanov has authored more than 100 journal articles and 18 books on Geophysical Inverse Theory and related topics over the past 40 years.