Gravity & Magnetics | Blended course

The “potential” of potential field methods (gravity and magnetics) will be studied and compared.

In part 1, various aspects of gravity will be discussed, based on an EAGE publication, such as the Earth gravity field, determining anomalies in the global field, establishing the depth of density anomalies, spherical or anticlinal, and the resolution, which is limited because of it being a potential field described by a 1ste order differential equation. Most promising is the development of gravity gradiometry, whereby gradients in the gravity field can be directly measured. These measurements are less sensitive to airplane and ship movement, generating accelerations.

In part 2, the Earth’s magnetic field will be studied. Being mainly due to the internal dipole source, direct interpretation of magnetic (dipole) data is inherently more difficult than (monopole) gravity data. Fortunately, a magnetic dipole anomaly can be transformed into a pseudo-monopole gravity anomaly. As different causative sources can produce the same surface measurements, non-uniqueness in the interpretation remains an issue for magnetic data as well. However, promising developments to mitigate these issues will be discussed. Moodle, a course management system will be used, facilitating interactions and quizzes will reinforce the learning.

This course is a blended course. It is lead remotely by the instructor that has daily direct interactions with the trainees for several hours. Trainees are self-learning for the rest of the day by doing exercises and going through the course material.  

The course consists of presentations, videos, and exercises. The presentations, also made available in pdf, are animated power point shows. The videos are either related to the exercises or general, some related to professional societies. In the exercises the methods discussed in the presentations are applied using computer programs. The solutions are discussed. Also, the course contains quizzes which are meant to reinforce the learning. Each quiz consists of multiple-choice questions.