Frequency electromagnetic sounding with industrial power lines on Karelia-Kola geotraverse
- 1 — Ph.D. Senior researcher Geological Institute of the Kola Science Centre of the RAS
- 2 — Ph.D., Dr.Sci. Chief researcher Geological Institute of the Kola Science Centre of the RAS
- 3 — Ph.D. Leading researcher Centre for Physical and Technological Problems of Energy in Northern Areas of the Kola Science Centre of the RAS
- 4 — researcher Centre for Physical and Technological Problems of Energy in Northern Areas of the Kola Science Centre of the RAS
Abstract
The paper describes theory, method and first experimental results of research on the interaction between electromagnetic waves of extremely low and ultra low frequency (0.1-200 Hz), the Earth crust and ionosphere in the field of two mutually orthogonal industrial power lines, 109 and 120 km long, in the course of FENICS experiment (Fennoscandian Electrical conductivity from Natural and Induction Control Source soundings). The main focus was on the observation results along the line of Karelia-Kola geotraverse over a distance of 700 km from the source. High horizontal homogeneity of geoelectrical lithosphere section has been detected in the eastern part of the Baltic shield at depth range from 10-15 to 50-70 km. Parameters of «regular» lithosphere section have been specified to the depth of 60-70 km. As a result of inverse problem solution for the western part of Karelia and Central Finland, a zone of decreased transverse resistivity has been detected at the depth of 50-60 km, corresponding to the area, detected by seismic methods, where Moho boundary reaches the same depth.
Funding
This work has been carried out with the support of research grant 13-05-12044 by Russian Foundation for Basic Research. Authors also express their gratitude to their colleague from University of Oulu M.Yu.Smirnov for his participation in observations and for the results he provided.