Paper presents the results of full-scale tests in ice conditions of Ladoga Lake of marine seismic survey sources and the area measuring seismic-acoustic system based on autonomous buoys of frozen type. The possibility of normal modes separation in the received signal, spreading in the layered system "ice cover - water layer - sedimentary layer - elastic half-space" is demonstrated. Based on the analysis of the solution of the direct problem, effective numerical algorithms of tomographic evaluation of the characteristics of the bottom, water layer and ice cover are constructed.
$^1$The Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences\
$^2$Faculty of Physics, Moscow State University. M.V. Lomonosov Moscow
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