LEADER 05277nam 22006014a 450 001 9911006653103321 005 20200520144314.0 010 $a1-281-02732-4 010 $a9786611027322 010 $a0-08-054299-9 035 $a(CKB)1000000000358291 035 $a(EBL)300716 035 $a(OCoLC)181827507 035 $a(SSID)ssj0000073116 035 $a(PQKBManifestationID)11123352 035 $a(PQKBTitleCode)TC0000073116 035 $a(PQKBWorkID)10103715 035 $a(PQKB)10618003 035 $a(MiAaPQ)EBC300716 035 $a(EXLCZ)991000000000358291 100 $a20020508d2002 uy 0 101 0 $aeng 135 $aur|n|---||||| 181 $ctxt 182 $cc 183 $acr 200 10$aThree-dimensional electromagnetics $eproceedings of the second international symposium /$fedited by Michael S. Zhdanov and Philip E. Wannamaker 205 $a1st ed. 210 $aAmsterdam ;$aNew York $cElsevier$d2002 215 $a1 online resource (305 p.) 225 1 $aMethods in geochemistry and geophysics,$x0076-6895 ;$v35 300 $aIncludes bibliographical references and indexes. 311 $a0-444-50429-X 327 $aFront Cover; Three-Dimensional Electromagaetics; Copyright Page; CONTENTS; Preface; Part I: 3-D EM Modeling; CHAPTER 1. AN INTEGRAL EQUATION SOLUTION TO THE GEOPHYSICAL ELECTROMAGNETIC FORWARD-MODELLING PROBLEM; 1. Introduction; 2. The Integral Equation; 3. Numerical Solution - Galerkin Approach; 4. Edge Element Basis Vectors; 5. The Green's Functions - Part I; 6. Evaluation of the Integrals; 7. The Green's Functions - Part II; 8. Examples; 9. Computational Efficiency; 10. Conclusions; References; CHAPTER 2. COMPRESSION IN 3-D INTEGRAL EQUATION MODELING; 1. Introduction 327 $a2. Forward Modeling with 3-D Integral Equations3. Compression Matrix; 4. Compression in Three Dimensions; 5. Compression as Preconditioner to the Integral Equation; 6. The ILU Preconditioned Conjugate Gradient Method; 7. Modeling Examples; 8. Conclusions; References; CHAPTER 3. MODELLING ELECTROMAGNETIC FIELDS IN A 3D SPHERICAL EARTH USING A FAST INTEGRAL EQUATION APPROACH; 1. Introduction; 2. Governing Equations; 3. Solution Verification; 4. Concluding Remarks; Appendix A. Dyadic Green's functions of radially symmetric section; References 327 $aCHAPTER 4. MODELLING INDUCTION LOG RESPONSES IN 3D GEOMETRIES USING A FAST INTEGRAL EQUATION APPROACH1. Introduction; 2. Theory; 3. Computational Load; 4. Numerical Examples; 5. Concluding Remarks; References; CHAPTER 5. NONLINEAR APPROXIMATIONS FOR ELECTROMAGNETIC SCATTERING FROM ELECTRICAL AND MAGNETIC INHOMOGENEITIES; 1. Introduction; 2. Integral Equation Formulation; 3. Born Approximation; 4. Localized Approximation; 5. Quasi-Linear Approximation; 6. Quasi-Analytical Approximation; 7. Numerical Results and Validation; 8. Conclusions; Appendix A. Quasi-Analytical One-Dimensional Solution 327 $aReferencesCHAPTER 6. THREE-DIMENSIONAL MODELING CONSIDERING THE TOPOGRAPHY FOR THE CASE OF THE TIME-DOMAIN ELECTROMAGNETIC METHOD; 1. Introduction; 2. Theory; 3. Numerical Checks; 4. Numerical Examples; 5. Conclusions; Appendix A. Correspondence of the Differential Coefficients between the Physical Domain and the Computational Domain; Appendix B. Derivation of the Finite-Difference Equations; References; CHAPTER 7. REDUCED-ORDER MODELING OF TRANSIENT DIFFUSIVE ELECTROMAGNETIC FIELDS; 1. Introduction; 2. Basic Equations; 3. Reduced-Order Models for the Diffusive Electromagnetic Field 327 $a4. Numerical Results5. Conclusions; Appendix A. The Lanczos Algorithm for Skew Symmetric Matrices; References; Part II: 3-D EM Inversion; CHAPTER 8. THREE-DIMENSIONAL MAGNETOTELLURIC MODELING AND INVERSION: APPLICATION TO SUB-SALT IMAGING; 1. Introduction; 2. The 3D MT Forward Problem; 3. The 3D MT Inverse Problem; 4. Marine MT Resolution Study; 5. Conclusions; Appendix A; References; CHAPTER 9. 2-D INVERSION OF FREQUENCY-DOMAIN EM DATA CAUSED BY A 3-D SOURCE; 1. Introduction; 2. Inversion Theory; 3. Synthetic Data Example; 4. Conclusions 327 $aAppendix A. Expectation of Objective Function in Constrained Linearized Least- Squares Method 330 $a""3-D modeling and inversion is a reality, and not an illusion."" This is the clear conclusion of the Second International Symposium on Three-Dimensional Electromagnetics held at the University of Utah in 1999. Containing papers submitted by 36 authors, this volume, by the sheer number of works, their diversity, and the truly international character of the efforts attests to the vigor with which the problems of the field are pursued today. The papers in this book are grouped in three parts: 3-D EM modeling; 3-D EM inversion; and 3-D EM in practice. They cover a wide range of to 410 0$aMethods in geochemistry and geophysics ;$v35. 606 $aMagnetic prospecting$vCongresses 615 0$aMagnetic prospecting 676 $a622/.153 701 $aZhdanov$b Michael S$053600 701 $aWannamaker$b P. E$g(Philip E.)$01822121 801 0$bMiAaPQ 801 1$bMiAaPQ 801 2$bMiAaPQ 906 $aBOOK 912 $a9911006653103321 996 $aThree-dimensional electromagnetics$94476831 997 $aUNINA