Abstract
Two effects have been studied concerning the former Wiese arrows and the newly determined complex induction vectors in the Pannonian backarc basin (Hungary): the remote effect of the curved Carpathian Conductivity Anomaly (CA) on the direction of the long period vectors, the local effect of the thickness (or conductance) of the conductive sediments on the induction vectors.
The curvature of the Carpathian CA is clearly seen in the direction of the induction vectors as a remote effect dividing the Pannonian Basin into two great parts from this point of view.
Following Zhang et al. (1993) who stated that the length (absolute value) of the induction vector becomes also constant in the “S-interval” as the magnetotelluric (MT) impedance which is related to the conductance of the sedimentary cover, it has been studied whether there is also any relation between the length of the induction vectors and the conductance of the same sedimentary cover (or thickness of sediment if its resistivity is constant). Due to the structural inhomogeneities to which the induction vectors are very sensitive, and to their great remote (side) effect, only a weak statistical relation has been found, nevertheless, its trend could be approximated by Ritter and Banks’ (1998) theory. Exceptional cases are demonstrated.
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Ádám, A., Koppán, A. Long period electromagnetic induction vectors in a sedimentary back-arc basin (Carpatho-Pannonian Basin). Acta Geod. Geoph. Hung 39, 363–379 (2004). https://doi.org/10.1556/AGeod.39.2004.4.5
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DOI: https://doi.org/10.1556/AGeod.39.2004.4.5