Electromagnetic Prospecting

Mode of Delivery

Face to Face

Prerequisites and Co-Requisites

None

Recommended Optional Programme Components

None

Course Contents

This course covers ;introduction to electromagnetic methods in geophysics,Maxwell equations and electromagnetic fields,introduction to magnetotelluric methods ,Magnetotelluric (MT) methods Interpretation of MT data ,control source audio magnetotelluric method,very low frequency (VLF-EM) method,VLF-Radiomagnetotelluric method,Loop-loop methods (EM-31, EM-34, EM-38),transient electromagnetic (TEM or TDEM) methods,ground penetrating radar,others electromagnetic methods.

Weekly Schedule

1) Introduction EM field theory Some mathematical definitions
2) Maxwell's equations and electromagnetic fields Gauss, Ampere, Faraday's Laws Maxwell's and Hertz's contribution to EM theory Maxwell's equations Pointing vector
3) Maxwell's equations and electromagnetic fields The depth of penetration Boundary conditions
4) Time and frequency domain Maxwell's equations EM Wave Equation Diffusion Equatio Helmholtz Equation Homework 1
5) Magnetotelluric method (MT) The history of the method The source of the method (sun, lightning strikes) Field scheme, lfield equipment and data acquisition Data processing Theory (the theory of plane wave) Cagniard apparent resistivity relations Simple relations for two-layer media N-layer 1-D media Homework 2
6) Magnetotelluric method (MT) Apparent resistivity curves Bostick Transformation Interpretation
7) Controlled-Source Magnetotelluric Method (CSAMT) The history of CSAMT Similarities and differences between MT and CSAMT method Controlled-Source Magnetotelluric Theory Solution in a uniform electric dipole Source-location problems (near and far field) The depth od penetration Measurement techniques and devices Interpretation
8) Midterm examination/Assessment
9) Very low frequency electromagnetic method (VLF-EM) The basic principles of VLF Measured quantities Plane electromagnetic wave theory Presentation of data and interpretation Data processing by filters Areas of application of the method, c Comparison of other EM methods Comparison of VLF-RMT, MT, and CSAMT Data acqusition Apparent resistivity relations Interpretation
10) Horizontal-Loop Electromagnetic Method (HLEM) Basic principles Areas of application Measured quantities EM-31, EM-34 and EM-38 features Data acquisition Data interpretation Homework 3
11) Transient or time domain electromagnetic method (TEM or TDEM) Basic principles Frequency and Time domain measurement techniques Measured quantaties Definitions of apparent resistivity The depth of penetration TEM arrays (different depths) Application areas Comparison of time and frequency EM methods
12) Ground penetrating radar (GPR) Basic principles of GPR Physical principles of the method Penetration depth Measuring devices Data acquisition Data processing Application examples Weak and superior aspects of the method Homework 4.
13) Other electromagnetic methods (I) The sea floor EM method (CSEM or seabed logging) Comparison of EM methods on land and in sea
14) Other electromagnetic methods (II) Induction well logging Comparison of EM methods on land and in a well The new generation of induction devices (3DEX and the Rt Scanner)
15) Other electromagnetic methods (III) Airborne EM methods Comparion of EM methods
16) Final examination

Recommended or Required Reading

1- Özürlan, G., ve Ulugergerli, E. U., 2007, Jeofizik Mühendisliğinde Elektromanyetik Yöntemler, Birsen Yayınevi.
2- Telford, W. M., Geldart, L. P. and Sheriff, R. E., 1996, Applied geophysics, Cambridge University Publication.
3- Keçeli, A., 2009, Uygulamalı Jeofizik, JFMO Eğitim Yayınları No:9

Planned Learning Activities and Teaching Methods

1) Lecture
2) Question-Answer
3) Drill and Practice
4) Group Study
5) Lab / Workshop
6) Problem Solving

Assessment Methods and Criteria

Contribution of Semester Studies to Course Grade	50%
Number Percentage Semester Studies Midterm Examination 1 50% Quiz 1 25% Practices 1 25%
Contribution of Final Examination to Course Grade	50%
Total	100%

Language of Instruction

Turkish

Work Placement(s)

Not Required