An international experiment FENICS (Fennoscandian Electrical conductivity from results of soundings with Natural and Controlled Sources) on the deep tensor electromagnetic sounding of the Fennoscandian (Baltic) shield has been carried out at the summer 2007. According to data analysis the maximal distance of signals registration reached to 1300 km (observatory Barensburg). The uniform primary database of the FENICS experiment is in progress. For the data treatment the program of synchronous spectral analysis of current and measured signals is developed. The programs of the forward and inversion problems solution for the deep soundings with taking into account the influence from ionosphere and displacement currents are developed. The inversion problem is solved on the basis of bimodal scheme with taking into account both (NS and EW) polarizations of the primary source.By results of tensor sounding the parameters of a normal geoelectrical section of the lithosphere are specified. On the basis of the experiment FENICS data it is made the preliminary modeling of the tectonic and physical conditions in lithosphere of the Fennoscandian (Baltic) shield at the transition zone crust-mantle and constructed the scheme of location of the low boundary of the cold lithosphere. Connected to the data, the boundary between pseudo-brittle and ductile conditions of substance is studied.
Zhamaletdinov A A Ismagilov V S Smirnov M Yu Vagin S A Tereschenko Ye D Vasiljev A N Gokhberg M B T Korja Shevtsov A N Korotkova T G Efimov B V Barannik M B Kolobov V V Prokopchuk P I Kopynenko Yu A Kopynenko Ye A
Centre for Phys. & Tech. Probl. of Energy in North., Kola Sc. Center of RAS. Apatity,184209. RUSSIA; St. Petersburg Branch of IZMIRAN. Saint Petersburg, 191023. RUSSIA St. Petersburg State University. Saint Petersburg, 199034. RUSSIA Polar Geophysical Institute of the Kola Sci. Center of RAS. Apatity, 184209. RUSSIA Institute of Physics of the Solid Earth of RAS. Moscow 123995. RUSSIA University of Oulu. FI-90014. FINLAND. Geological Institute of the Kola Sci. Center of RAS. Apatity, 184209. RUSSIA. Centre for Phys. & Tech. Probl. of Energy in North., Kola Sc. Center of RAS. Apatity,184209. RUSSIA