TPG4195 - Gravimetry and Magnetometry


Examination arrangement

Examination arrangement: Portfolio assessment
Grade: Letters

Evaluation form Weighting Duration Examination aids Grade deviation
Work 25/100
Oral examination 75/100 D

Course content

The application of gravity and magnetic data in exploration and regional studies with focus on integrated modelling of potential fields to improve seismic and geological interpretation. Calculation and application of potential field attributes. Petrophysical properties of rocks. Potential field theory. Instrumentation. Gravity and magnetic measurements, processing, and map analysis. Anomalies from simple geometric models. Separation of anomalies. Fourier transform. Processing in the wave number domain, 1D and 2D. Direct and indirect methods. Available potential field databases in Norway.

Learning outcome

The students should have a good understanding of the application of gravimetry and magnetometry in interpretation and modelling, with special focus on application in exploration to crustal scale studies.

The students should understand the main principles behind processing and interpretation of magnetic and gravity data and how these methods are exploited for improved understanding of onshore and offshore subsurface. The students will be able to perform processing, map production, interpretation and forward and inverse modelling using PC software.

General competence:
The students should understand how different methods are combined in geophysical interpretation to improve reliability and increase information availability. They should also be trained to use critical evaluation of data and models, and to present scientific work to others.

Learning methods and activities

Lectures and exercises. Exercises are mandatory and comprise fieldwork at one weekend with gravity and magnetic data acquisition. The teaching may be given in English.

Compulsory assignments

  • Exercises

Further on evaluation

Portfolio assessment is the basis for the grade in the course. The portfolio includes a final oral exam (75%) and evaluation of compulsory exercises (25%). The results for the parts are given in %-scores, while the entire portfolio is assigned a letter grade. The examination papers may be given in English only. Students are free to choose Norwegian or English for written assessments. For a re-take of an examination, all assessments during the course must be re-taken.

Specific conditions

Exam registration requires that class registration is approved in the same semester. Compulsory activities from previous semester may be approved by the department.

Course materials

Blakely, R.J., 1996. Potential Theory in Gravity and Magnetic Applications. Cambridge University Press.
ISBN: 0-521-57547-8
Reeves, C., Aeromagnetic surveys: principles, practice & interpretation. e-Published by GEOSOFT (http://www., 2005, 155 pp.

Credit reductions

Course code Reduction From To
SIG4063 7.5



Examination arrangement: Portfolio assessment

Term Statuskode Evaluation form Weighting Examination aids Date Time Room *
Autumn ORD Work 25/100
Autumn ORD Oral examination 75/100 D
  • * The location (room) for a written examination is published 3 days before examination date.
If more than one room is listed, you will find your room at Studentweb.