Geophysics 424 - Electromagnetic and potential field methods
September 2020 : These notes are temporarily offline as the material is being developed.
If you would like access, please e-mail me at unsworth@ualberta.ca
Course outline
Outline of 424 - Electromagnetic methods(PDF) 
A : Overview of electromagnetic methods
A:Summary of Electromagnetic methods(PDF)
B : Resistivity of rocks
B:Electrical resistivity of rocks
C : Maxwell's equations
C: Theory of EM field propagation in the Earth
atten_movie.m 
atten_movie_colour.m
D : Magnetotellurics
D1:Theory of magnetotellurics over a 1-D Earth
MT_physics_correct_movie.m
Fit 1D model in MATLAB - TBT180 - Revised 2007 
Animations of 1-D MT sounding curves
Example 2 : Varying the depth of a layer
Example 3 : Constant conductance
Example 4 : Two layers : varying the conductance of the lower conductor
D2:Theory of magnetotellurics over a 2-D Earth
D3: Field techniques for Magnetotellurics exploration
D4:Applications of magnetotelluric exploration
Analogue-to-digital-conversion (ts_tutorial_v1.m)
E : Frequency domain electromagnetic methods
E1:Primary EM fields in the frequency domain
E2 : Loop-loop EM systems in the near-field
E2.1 : EM responses of 1-D resistivity models
E2.2 : EM responses of a 2-D resistivity models
E2.3 : Generation of secondary EM fields
E2.4 : Applications of near-field frequency domain EM techniques
E3 : Far field frequency domain EM exploration
E3: VLF, CSAMT and Marine CSEM
VLF_1.m Computes VLF fields over a conductor (MATLAB)
VLF_2.m Simulates use of a VLF instrument
Quicktime movie of an electric dipole in a conductor. f=0.25 Hz (courtesy Kerry Key)
E4 : Advantages and disadvantages of frequency domain EM methods
F : Time-domain electromagnetic methods
F:Time-domain electromagnetic methods
input_EM_v1.m EM fields for the INPUT system
C6_time_domain_v1.m 6-channel airborne system
G : Ground penetrating radar
G1: EM wave propagation in the Earth
G2: Travel time curves for GPR
G3: Data collection and analysis techniques for GPR data
G4: Applications of GPR
All GPR notes in a single PDF