The Results of Marine Electromagnetic Sounding with a High-
Power Remote Source in the Kola Bay in the Barents Sea

V. F. Grigoriev^a, S. M. Korotaev^b, M. S. Kruglyakov^c, D. A. Orekhova^d, I. V. Popova^e,
E. D. Tereshchenko^a, P. E. Tereshchenko^f, and Yu. G. Schors^d

^a Polar Geophysical Institute of Kola Science Center, Russian Academy of Sciences,
ul. Khalturina 15, Murmansk, 183010 Russia

^b Geoelectromagnetic Research Centre of the Institute of Physics of the Earth, Russian Academy of Sciences,
Troitsk, Moscow, 142190 Russia

^c Faculty of Computational Mathematics and Cybernetics, Moscow State University, Moscow, 119991 Russia

^d National Research Centre Kurchatov Institute, pl. Akademika Kurchatova 1, Moscow, 123182 Russia

^e Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, ul. Bol’shaya Gruzinskaya 10, Moscow, 123995
Russia

^f St. Petersburg Branch of the Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation,
Muchnoi per. 2, St. Petersburg, 181023 Russia

e-mail ordaal@gmail.com

Received May 21, 2012

Abstract—The first Russian six-component seafloor electromagnetic (EM) receivers were tested in an experi-
ment carried out in Kola Bay in the Barents Sea. The signals transmitted by a remote high-power ELF source
at several frequencies in the decahertz range were recorded by six receivers deployed on the seafloor along the
profile crossing the Kola Bay. Although not all the stations successfully recorded all the six components due to
technical failures, the quality of the data overall is quite suitable for interpretation. The interpretation was car-
ried out by the three-dimensional (3D) modeling of an electromagnetic field with neural network inversion. The
a priori geoelectrical model of Kola Bay, which was reconstructed by generalizing the previous geological and
geophysical data, including the data of the ground magnetotelluric sounding and magnetovariational profiling,
provided the EM fields that are far from those measured in the experiment. However, by a step-by-step modifi-
cation of the initial model, we achieved quite a satisfactory fit. The resulting model provides the basis for intro-
ducing the corrections into the previous notions concerning the regional geological and geophysical structure
of the region and particularly the features associated with fault tectonics.

DOI: 10.1134/S1069351313030075

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