Magnetotelluric and audiomagnetotelluric measurements in Finland

  • Ádám A
  • Kaikkonen P
  • Hjelt S
 et al. 
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Joint Finnish-Hungarian MT (magnetotelluric) and AMT (audiomagnetotelluric) measurements were carried out in Finland in the framework of the international ELAS project. The conditions for MT measurements are favorable at these latitudes. Five MT and 150 AMT stations gave information on the electrical conductivity distribution in the area: AMT results guided the choice of MT sites with minimal near-surface distortion effects and helped the interpretation of the MT soundings; the MT measurements indicate the presence of large conductivity anomalies and can be best interpreted as lateral induction effects of near-surface dyke structures. This result is confirmed by a certain correspondence between the directions of the maximum impedances and of the tectonic zones of the area. Any information about the upper mantle would require the use of Sqharmonics because of the crustal conductivity anomalies detected by the MT measurements. © 1982.

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  • A. Ádám

  • P. Kaikkonen

  • S. E. Hjelt

  • K. Pajunpää

  • L. Szarka

  • J. Verö

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