Master’s studies

# Syllabus for Electromagnetic Geophysics

Elektromagnetisk geofysik

## Syllabus

• 10 credits
• Course code: 1GE057
• Education cycle: Second cycle
• Main field(s) of study and in-depth level: Physics A1F, Earth Science A1F
• Grading system: Fail (U), 3, 4, 5.
• Established: 2016-03-10
• Established by: The Faculty Board of Science and Technology
• Applies from: week 30, 2016
• Entry requirements: 180 credits including 80 credits in physics and mathematics, including The Earth's Potential Fields, 5 credits.
• Responsible department: Department of Earth Sciences

## Learning outcomes

After completing the course the student is expected to be able to :

• Derive the differential equations governing electromagnetic induction in the Earth starting from Maxwell's equations.
• Derive electromagnetic fields and their potentials owing to controlled (galvanic and inductive) and natural sources over a stratified Earth.
• Develop least squares estimates of transfer functions from experimental time-series data.
• Describe and apply the fundamental properties of the impedance tensor and other transfer functions for plane waves over an Earth of arbitrary dimension accounting for galvanic distortion.
• Explain the principles of numerical models like finite-difference and integral equation methods to solve forward problems in 2D and 3D.
• Explain how model sensitivities can be calculated using the reciprocity theorem.
• Make recommendations as what technique is best suited for solving a given electromagnetic problem with respect to depth penetration and resolution.

## Content

Introduction Maxwell’s equations. Reflection and refraction of plane waves. Potentials of electric and magnetic fields. Sources in unbounded media. Finite sources: magnetic and electric dipoles. Time series analysis. Least squares and robust least squares estimates. Electromagnetic transfer functions. Distortion of electromagnetic fields. Numerical modelling: integral equations and finite differences. Computation of sensitivities. Geoelectric methods.

## Instruction

Lectures, home work assignments, problem solution and computer exercises.

## Assessment

Written examination (8 credits), homework assignments (1 credit), and oral presentation (1 credit).

Applies from: week 31, 2016

• Corbett, John D.; Nabighian, M. N. Electromagnetic methods in applied geophysics. : Vol. 1 Theory

Tulsa, Okla.: Society of Exploration Geophysicists, 1988

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