Electromagnetic Methods.

Electromagnetic Methods: Theory and Applications, Volume 66 highlights new advances in the field, with this new volume presenting interesting chapters written by an international board of authors.

Bibliographic Details
Main Author:	Schmelzbach, Cedric
Corporate Author:	ScienceDirect (Online service)
Other Authors:	Mittelholz, Anna, Kang, Seogi, Schnepf, Neesha
Format:	eBook
Language:	English
Published:	Chantilly : Elsevier Science & Technology, 2025.
Edition:	1st ed.
Series:	Advances in Geophysics Series.
Subjects:	Magnetic prospecting. Prospection magnétique. magnetic surveying. Electronic books.
Online Access:	Connect to the full text of this electronic book

Table of Contents:

Front Cover
Advances in Geophysics
Copyright
Contents
Contributors
Preface
Chapter One: Electromagnetic Foundations
1 Fundamentals of Electromagnetic (EM) Studies
1.1 Mathematical Foundation
1.2 Magnetotelluric Transfer Function and Impedance
1.3 Spherical Harmonics Expansion and EM Sounding
2 Geomagnetic Field Sources
2.1 Long Period (∼100 y to ∼1 My) Geomagnetic Fields
2.2 Medium and Short Period (Months to Seconds) Geomagnetic Fields
3 Data Sets
3.1 Ground Electromagnetic Observations
3.1.1 Magnetometer Observatories
3.1.2 Magnetometer Stations and Networks
3.1.3 Magnetotelluric Datasets
3.2 Marine Electromagnetic Observations
3.3 Low Earth Orbiting (LEO) Magnetic Observations
3.4 Beyond Earth: Planetary Missions
4 Resources Here and Beyond
Acknowledgments
References
Chapter Two: Electromagnetic induction in the Earth's mantle and oceans: A spherical-harmonic approach
1 Introduction
2 Forward modelling
2.1 The electromagnetic induction equation in a spherical Earth
2.2 Spherical harmonic approach
2.3 Assembly of the linear problem
2.4 Time discretization and linear problem solution
3 Inverse modelling
3.1 Global EM induction inverse problem
3.2 Model parameters
3.3 External and internal sources
3.4 Data and misfit
3.5 Solution of the inverse problem
4 Applications
5 Outlook
Acknowledgement
References
Chapter Three: Marine controlled-source and magnetotelluric methods
1 Introduction
2 History
2.1 Industry use of marine CSEM
3 Theory and computation
3.1 Half-space relationships
3.2 The one-dimensional Earth
3.3 The two-dimensional Earth
3.4 The three-dimensional Earth
4 The marine electromagnetic environment
5 The magnetotelluric coast effect
6 Time domain versus frequency domain CSEM.
7 Instruments
8 Processing
8.1 Magnetotelluric processing
8.2 Controlled-source EM processing
8.3 General considerations
9 Navigation
10 Anisotropy
11 Some examples of marine Em studies
12 Concluding thoughts
12.1 Plate boundary studies
12.2 Lake-bottom MT
12.3 Gas hydrate studies
12.4 Seafloor massive sulfides
12.5 Shallow water seafloor characterization
12.6 Integration with seismic methods
Acknowledgements
References
Further reading
Chapter Four: Probing the Lunar Interior with Electromagnetic Geophysical Methods
1 Introduction
1.1 Lunar Interior Structure
1.2 Lunar Magnetic Fields
2 Methods
2.1 Basic Equations
2.2 Response Functions
2.2.1 The Classic C-Response
2.2.2 Multi-point Transfer Function
2.2.3 Magnetotellurics
2.2.4 Multiple Stations: The Horizontal Gradient Method
3 External Field Plasma Environment
4 Data Sets
4.1 Data Availability
4.2 Known Data and Instrument Issues
5 Core Sounding
5.1 Core Detection Studies
5.2 Discussion
6 Mantle Sounding
6.1 Multi-Point Transfer Function Studies
6.2 A Global C-response
6.3 Electrical Conductivity
6.4 Synthesis and Interpretation
7 Summary and Future Lunar EM Sounding
7.1 Limitations and Improvements of Future EM Studies
7.2 Outlook
Acknowledgments
References
Chapter Five: Sensor development and applications in mineral exploration
1 Overview of EM instrumentation
2 Instrumentation selection and application
2.1 dB/dt sensors
2.2 B-field sensors
2.3 B-field coils
2.3.1 Fluxgates
2.3.2 SQUIDs
2.3.3 Total field
2.3.4 Receivers
2.3.5 Transmitters
3 EM sensors
history, theory, and design
3.1 Overview
3.2 Coils
3.2.1 dB/dt field coils
feedback or current
3.2.1.1 Theory
3.2.1.2 Design considerations.
3.2.1.3 Challenges
3.2.2 B field coils
3.2.2.1 Theory
3.2.2.2 Current amplifier
3.2.2.3 Feedback flux voltage amplifier
3.2.2.4 Amplifier design
3.2.2.5 Coil design
3.2.2.6 Calibration
3.3 Conclusion
3.4 Fluxgate
3.5 SQUIDs
3.6 Flux detection
3.7 External field limitations
3.8 SQUID readout
3.9 Novel magnetic field sensors
3.9.1 Optically pumped magnetometers
3.10 Nitrogen vacancy magnetometers
3.11 Cold atom magnetometers
3.11.1 Progress on other non-quantum magnetometers
4 EM receivers
history, theory, and design
4.1 Overview
4.2 Processing
4.2.1 Stacking
4.2.2 Windowing
4.2.3 Deconvolution
4.2.4 Multiple transmitters and frequencies
5 EM transmitters
history, theory, and design
5.1 Overview
5.2 EM transmitter design considerations
5.2.1 Safety considerations
5.2.2 Power-to-weight ratio
5.2.2.1 Magnetic component optimization
5.2.2.2 Semiconductor component optimization
5.2.3 Fault tolerance and reliability
5.2.4 Waveform quality
6 Outlook for the future
References
Back Cover.