Geophysics Msc - BMEEOAFMF51

3

név	Dr. Lajos Völgyesi
beosztás	Professzor emeritus
email	volgyesi.lajos@emk.bme.hu

Általános- és Felsőgeodézia Tanszék

magyar és angol

2021. szeptember 1.

Geophysics has three basic objectives.

The most important thing is to supply and complete the knowledge about the Earth, to know the interaction that exists between geodesy discussing the geometry of the Earth and geophysics discussing the physics of the Earth. Since the geoid (the theoretical shape of the Earth) is defined by a physical concept (the gravity), geophysics is in close connection to the geodesy and cosmic geodesy. An important aim of the course is to get knowledge of students about the physical structure and processes inside the Earth by seeing the connections between the shape of the Earth and the inner processes and material structure of our planet. The subject seeks to provide the physical background and explanation of the most important contexts and phenomena that students encountere in learning of the different subjects. Another important goal of the course is to draw attention to the dynamism of our Earth; that everything is constantly changing around us.. Surveyors need to be aware of where, under what circumstances, and for how long our control points can be considered to be motionless. To do this, we need to know to what extent the shift of our control points is caused by different causes e.g. movements caused by temperature changes, tectonic movements of the earth's surface, or e.g. the displacement of the coordinate system (displacement of the center of mass or the precession and nutation motion of the Earth). The Earth must therefore not be seen as a boring empty body, not as some abstract mechanical concept, but as a constantly evolving, exciting, changing living planet. This is important for geodesy, because most of the changes due to the physical processes that take place exceed the accuracy of today's modern geodetic measurements. Finally, surveyors need to know and understand the language of earth science professionals just as much as civil engineers, as they have an increasing role to play in this field as well.

Lectures, written and oral communication.

Week	Topics of lectures and/or exercise classes
1.	The role and significance of geophysics in earth sciences and geodesy.
2.	Basic concepts of Earth’s magnetic field, normal geomagnetic field and anomalies.
3.	Time variation of geomagnetic field, the origin of the magnetic field, the explanation of the changes.
4.	Basic seismological concepts, formation, propagation and registration of earthquake waves, spatial and temporal distribution of earthquakes.
5.	Free oscilations of the Earth, the inner structure of the Earth based on earthquake waves.
6.	Radioactivity and geothermics and their significance in geodynamics
7.	Base concepts of the gravity and gravitation, description of the gravity field by spherical harmonics
8.	Normal gravity field, spheroids and gravity anomalies
9.	Aplying of gravity anomalies in geophysics and geodesy.
10.	Time variation of gravity field, the Earth’s tide
11.	The rotation of the Earth: Motion of a heavy and a free gyroscope, lunisolar and planetary precession, general precession, disturbing precession.
12.	Earth's rotation: Euler's free nutation, forced mutation, polar motion, polar wandering.
13.	Geotectonics: continental drift, ocean floor spreading, plate tectonics.
14.	Geoscientific foundation of 4D geodesy

A félév közbeni munkaszüneti napok miatt a program csak tájékoztató jellegű, a pontos időpontokat a tárgy honlapján elérhető "Részletes féléves ütemterv" tartalmazza.

On-line materials will be available in the homepage of the subject

Inactive courses

The assessment of the learning outcomes specified in clause 2.2 above and the evaluation of student performance occurs via a midterm test and an oral exam.
Duration of the midterm test is 30 minutes.

Evaluation form	Abbreviation	Assessed learning outcomes
Midterm test	MT1	A.1-A.8
Oral exam (summary assessment)	E1	A.1-A.13; B.1-B.4; C.1-C.3; D.1-D.3

A szorgalmi időszakban tartott értékelések pontos idejét, a házi feladatok ki- és beadási határidejét a "Részletes féléves ütemterv" tartalmazza, mely elérhető a tárgy honlapján.

The condition for obtaining a signature is that the student achieves at least 50% of the scores according to 3.3 and midterm tests (MT1) is successful.
Anyone who has signature and not register for exam course, his/her midterm result will be overwriten by the recapture result.
The midterm result that can be taken into account at the examination grade previously obtained from the subject can be accepted retroactively for 2 semester.

In case of retaking an assessment the second result will be taken into account from the new and previous results.
In case of failing the retake, there is a possibility for a second retake – after the payment of the predetermined fee - in the completion week

2021. szeptember 1.

Inactive courses