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Induction Sounding of the Earth's Mantle at a New Russian Geophysical Observatory

Moilanen J., Pushkarev P.Yu.

Acta Geophysica

2015

Vol. 63, no. 2

385--397

Deep magnetotelluric (MT) sounding data were collected and processed in the western part of the East European Craton (EEC). The MT sounding results correspond well with impedances obtained by magnetovariation (MV) sounding on the new geophysical observatory situated not far from the western border of Russia. Inversion based on combined data of both induction soundings let us evaluate geoelectrical structure of the Earth’s crust and upper and mid-mantle at depths up to 2000 km, taking into account the harmonics of 11-year variations. Results obtained by different authors and methods are compared with similar investigations on the EEC such as international projects CEMES in Central Europe and BEAR in Fennoscandia.

Magnetotelluric studies of the East-European Craton and adjacent regions

Bubnov V.P., Yakovlev A.G., Aleksanova E.D., Yakovlev D.V., Berdichevsky M.N., Pushkarev P.Yu.

Acta Geophysica

2007

Vol. 55, no. 2

154-168

Magnetotelluric method is widely applied to study the Russian part of the East-European Craton, as well as the Caucasus and the Urals: several thousand soundings were performed during the last few years. Their periods range is approximately from 0.003 to 3000 seconds, which allows to study the sedimentary cover and the consolidated crust. Resistivity cross-sections along several regional profiles which run across the tectonic structures of the East-European Craton and the adjacent folded systems were obtained, mainly using 1D and 2D interpretational tools. MT investigations provided important information about the structure and reservoir properties of sedimentary complexes, the state of active geodynamic regions, the graphitization and fluid regime of the consolidated crust, and the perme-able and fluid-saturated crustal zones.