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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.

Geoelectrical model along a profile across the Tornquist-Teisseyre zone in southeastern Poland

Ernst T., Jankowski J., Jóźwiak W., Lefeld J., Logvinov I.

Acta Geophysica Polonica

2002

Vol. 50, nr 4

505-515

We present results from the Polish part of a long international profile, ranging from the Ukraine to Hungary (PREPAN 95) and traversing the T-T zone in southeastern Poland, extended by data from two new geomagnetic soundings made in 1997. The new data allowed us to create a more detailed and realistic model. The 2-D interpretation was carried out on the basis of the complex induction vectors obtained from six points, supplemented by information derived from deep magnetotelluric soundings in Pawłówka. The results have shown that to the north of the well-known Carpathian anomaly, there are two deep and conductive faults within T-T zone. The joint interpretation of the deep magnetotelluric sounding comprising the results from Pawłówka and magnetovariation data from the Lvov Magnetic Observatory suggests the existence of a conductive zone at depths of about 100-200 km.