A.V. Avraamov - Research Scientist, LTD «Special Technological Center» (St. Petersburg). E-mail: avraamov@stc-spb.ru V.Je. Asming - Ph.D. (Phys.-Math.), Leading Research Scientist, Kola Branch of Geophysical Service RAS (Apatity, Murmansk region). E-mail: asmingve@mail.ru Yu.A. Vinogradov - Ph.D. (Eng.), Deputy Director on Scientific Work, Kola Branch of Geophysical Service RAS (Apatity, Murmansk region). E-mail: uavin@mail.ru N.N. Voronin - Ph.D. (Eng.), Associate Professor, Research Scientist, LTD «Special Technological Center» (St. Petersburg). E-mail: voronin_nn@mail.ru Yu.L. Hohlenko - Ph.D. (Eng.), Associate Professor, Senior Research Scientist, LTD «Special Technological Center» (St. Petersburg). E-mail: xox1404@rambler.ru