Authors:
E. Takács Department of Geophysics, University of Miskolc H-3515, Miskolc-Egyetemváros, Hungary

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G. Pethő Department of Geophysics, University of Miskolc H-3515, Miskolc-Egyetemváros, Hungary

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I. Szabó Department of Geophysics, University of Miskolc H-3515, Miskolc-Egyetemváros, Hungary

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Current density pseudosections derived by filtering and probability tomography from calculated VLF vertical magnetic profiles over synthetic 2D targets with geometrical shape are examined critically. It was found that the position and shape of  target only in the case of single inhomogeneities with very limited cross-sectional area and simple shape can be revealed reliably by them. The locations of sharp cross-sectional boundaries can only be guessed. Fictitious, misleading current-density indications occur in the case of laterally extended, or multiple targets at too wide filter windows. Both procedures suppose that the measured values originate in the superposition of the magnetic fields of individual stationary current-lines inside the target. It is shown that in the quasistationary range the shape and position of the target can be outlined sharply using this simplified form of the forward problem solution and performing an inversion with respect of the vertices of the polygon approximating the cross-sectional contour of the target. Several kinds of inversionprocedures  were tested.

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Acta Geodaetica et Geophysica
Language English
Size B5
Year of
Foundation
2013
Volumes
per Year
1
Issues
per Year
4
Founder Magyar Tudományos Akadémia
Founder's
Address
H-1051 Budapest, Hungary, Széchenyi István tér 9.
Publisher Akadémiai Kiadó Springer
Nature Switzerland AG
Publisher's
Address
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher
Chief Executive Officer, Akadémiai Kiadó
ISSN 2213-5812 (Print)
ISSN 2213-5820 (Online)

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