Processing and Modeling of Gravity, Magnetic and Electromagnetic Data in the Falkenberg Area, Sweden
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Falkenberg area is located in southwest Sweden formed in the Sveconorwegian orogen and contains an extremely complex geological structure. Multiple geophysical datasets have been acquired and together with available petrophysical information, models corresponding to the subsurface geological structures were generated. The collected data comprise ground magnetic, AMT (Audio Magnetotelluric) and RMT (Radio Magnetotelluric) data. The available airborne magnetic and ground gravity data acquired by the Geological Survey of Sweden (SGU) as well as the reflection seismic section from a study made by Uppsala University further aids in obtaining substantially improved interpretation of the geometry of the structures along the AMT profile. The principal objective of this profile was to delineate and map the possible deformation zone crossed by the profile. The AMT study was expected to complement existing geophysical data and improve existing interpretations. The Ullared deformation zone contains decompressed eclogite facies rocks. The presented results were obtained by comparison of different geophysical methods along the profile. The susceptibility model and resistivity model show that eclogites have higher resistivity and susceptibility than the surrounding structures. However use of the Occam type of inversion on the AMT data, makes the resistivity model smoother than the susceptibility model and as a results it is difficult to estimate the dip of the structures. The AMT profile and the seismic section show the same dip direction (NE) for the eclogite bearing structures although due to the smoothing in the AMT model the dips seen in the seismic section cannot be recovered in the resistivity model.
Place, publisher, year, edition, pages
2014. , 40 p.
Examensarbete vid Institutionen för geovetenskaper, ISSN 1650-6553 ; 296
magnetic. gravity, potential field, magnetotelluric, forward modeling, inversion, electromagnetic, airborne
Natural Sciences Geophysics
IdentifiersURN: urn:nbn:se:uu:diva-232714OAI: oai:DiVA.org:uu-232714DiVA: diva2:749217
Subject / course
Master Programme in Physics
2014-09-12, Dk235, Department of Earth science, Villavägen 16, 752 36 Uppsala, Uppsala, 15:00 (English)
Pedersen, Laust B, ProfessorBastani, Mehrdad