Deep electromagnetic studies of the Baltic Shield
Article Sidebar
Published:
Aug 30, 1984
Keywords:
Baltic Shield,
Induction studies,
Crustal conductive structure,
Conductive asthenosphere,
Geoelectric models,
Magnetotellurics,
Magnetometer arrays,
Frequency sounding
Volumes
Vols. 1-18 (1924-1944), ISSN 0044-2801
Main Article Content
Abstract
The first systematic collection of magnetotelluric, magnetovariational and frequency sounding results for the Baltic Shield is presented. The great variations in data processing and interpretation methodology make it difficult to present any unified summary of the existing results. Conductive regions in the crust occur in all parts of the shield; sometimes in connection with schist zones, variations in bedrock structure and composition, and sometimes as apparent conductive layering in the depth range 15-25 km. The extent of this layer, as well as the conductive layer at asthenospheric depths in the northern parts of the shield, cannot yet be established. The usefulness of combining electromagnetic and other geophysical data is indicated by the example from central Finland, where deep seismic sounding results seem to be able to explain long-period anisotropies of magnetotelluric sounding curves.
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How to Cite
Hjelt, S. (1984). Deep electromagnetic studies of the Baltic Shield. Journal of Geophysics, 55(1), 144-152. Retrieved from https://journal.geophysicsjournal.com/JofG/article/view/295
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References
Adam, A., Kaikkonen P., Hjelt, S.E., Pajunpaa, K., Szarka, L., Vero, J., Wallner, A. (1982) Magnetotelluric and audiomagnetotelluric measurements in Finland. Tectonophysics 90:77-90
Berthelsen, A. (1983) The tectonic division of the Baltic Shield. Paper presented at the 1st Workshop on the European Geotraverse, Northern Segment, Copenhagen
Gaal, G. (1981) Proterozoic tectonic evolution and late Svecokarelian plate deformation of the Central Baltic Shield. Geol. Rundschau 71:(1)
Golod, M.I., Grishin, A.S., Klabukov, B.N. (1980) On the deep structure of Northern Karelia (in Russian). Methods and results of geophysical research in the north-eastern part of the Baltic Shield, Apatity, Geol. Inst., Kola branch, AN SSSR
Golod, M.I., Klabukov, A.N., Grishin, A.S. (1983) Geoelectrical model of the central part of Karelia. Paper presented at the Symposium "The Geoelectric Model of the Baltic Shield", Oulu, Finland
Gorbunov, G.I., Belkov, I.V., Pavlovsky, V.I., Zhamaletdinov, A.A., Kachevlin, P.L., Kachlev, Ju.P., Velikhov, E.P., Volkov, Ju.M., Dreizin, Ju.A., Kuksa, Ju.I., Zotov, A.B., Jevstigneyev, V.V., Lisin, A.S., Shukov, B.P., Vengersky, V.V., Babakov, Ju.P. (1979) Deep electromagnetic sounding with the MHD-generator on the Kola peninsula (in Russian). Dokl. AN SSSR, 247/3:578-582
Gorbunov, G.l., Belkov, I.V., Pavlovsky, V.l., Zhamaletdinov, A.A., Velikhov, E.P., Volkov, Ju.M., Dreizin, Ju.A. (1982) On the character of the electrical conductivity of the Earth's crust of the Kola Peninsula obtained from soundings with the MHD-generator. Geomagnetic Researches No 28, Moskva, "Radio i Svyaz" (In Russian)
Heikka, J., Zhamaletdinov, A., Demidova, T.A., Hjelt, S.E. (1983) MHD test registrations in Northern Finland. Paper presented at the IUGG XVIII General Assembly, Hamburg
Jones, A.G. (1980) Geomagnetic induction studies in Scandinavia. I Determination of the inductive response function from the magnetometer array data. J. Geophys. 48:181-194
Jones, A.G. (1981a) Geomagnetic induction studies in Scandinavia. II. Geomagnetic depth sounding, Induction vectors and coast-effect. J. Geophys. 50:23-36
Jones, A.G. (1981b) On a type classification of lower crustal layers under Precambrian regions. J. Geophys. 49:226-233
Jones, A.G. (1982a) On the electrical crust-mantle structure in Fennoscandia: No Moho, and the asthenosphere revealed? Geophys. J. R. Astron. Soc. 68:371-388
Jones, A.G. (1982b) Observations of the electrical asthenophere beneath Scandinavia. Tectonophysics 90:37-55
Jones, A.G., Olafsdottir, B., Tiikkainen, J. (1983) Geomagnetic induction studies in Scandinavia. - III Magnetotelluric observations. J. Geophys. 54:35-50
Jones, A.G. (1984) The electrical structure of the lithosphere and asthenosphere beneath the Fennoscandian shield. J. Geomagn. Geoelectr. (In press)
Kaikkonen, P. (1983) Numerical thin sheet modelling of magnetotelluric field distortions by the hybrid technique. IV Results for the Baltic Shield. Paper presented at the IUGG XVIII General Assembly, Hamburg
Kaikkonen, P., Vanyan, L.L., Hjelt, S.E., Shilovsky, A.P., Pajunpaa, K., Shilovsky, P.P. (1983) A preliminary geoelectrical model of the Karelian megablock of the Baltic Shield. Phys. Earth Planet.
Inter. 32:301-305
Kaikkonen, P., Pajunpaa, K. (1984) Audiomagnetotelluric measurements across the Lake Ladoga-Bothnian Bay zone in Central Finland. Gephys. J. R. Astron Soc. 78 (In press)
Korja, T. (1983) On magnetotelluric measurements in Finland. Paper presented at the Symposium "The Geoelectric Model of the Baltic Shield", Oulu, Finland
Kovtun, A.A. (1976) Induction studies in stable shield and platform areas. Acta Geod. Geophys. Mont. Acad. Sci. Hung. 11/3-4:333-346
Krasnobayeva, A.G., Dyakonov, B.P., Astafyev, P.F., Batalova, O.V., Vishnev, V.S., Gavrilova, I.E., Zhuravleva, P.B., Kirillov S.K. (1981) Structure of the northeastern part of the Baltic Shield, based on magnetotelluric data. Earth Physics, Izv. AN SSSR 17/6
Krasnobayeva, A.G., Dyakonov, B.P., Astafyev, P.F., Batalova, O.V., Vishnev, V.S., Gavrilova, I.E., Zhuravlova, P.B., Kirillov, S.K. (1982) Magnetotelluric data on the geoelectric structure in the
northeastern part of the Baltic Shield. Acta Geod Geophys. Mont. Acad. Sci. Hung. 17/2:255-265
Krasnobayeva, A.G., Dyakonov, B.P., Skachkov, P.P. (1983) Results of electromagnetic investigations on the Murmansk block of the Baltic Shield. Paper presented at the Symposium "The Geoelectric Model of the Baltic Shield", Oulu, Finland
Kuppers, F., Untiedt, J., Baumjohann, W., Lange, K., Jones, A.G. (1979) A two-dimensional magnetometer array for ground-based observationsof auroral zone electric currents during the International
Magnetospheric Study (IMS). J. Geophys. 46:429-450
Lange, K. (1979) Induktionseffekte in Nordskandinavien - untersucht am Beispiel zweier ostwarts flieBender polarer Elektrojets. Diplomarbeit, Munster Univ.
Luosto, U., Lanne, E., Korhonen, H., Guterch, A., Grad, M., Materzok, R., Pajchel, J., Perchuc, E., Yliniemi, J. (1982) Results of the Deep Seismic Sounding of the Earth's crust on the profile SVEKA. Proc. of the 18th General Ass. of ESC, Leeds (In press)
Pajunpaa, K. (1984) Magnetometer array studies in Finland - determination of single station transfer function. J. Geophys. (In press)
Pajunpaa, K., Heikka, J., Korja, T. (1984) Magnetometer array studies in Finland, J. Geomagn. Geoelectr. (In press)
Pavlovsky, B.l., Zhamaletdinov, A.A., Takachev, G.S., Rokityansky, I.I., Kulik, S.N. (1978) On the results of search for conductivity anomalies of the Imandra-Varzuga structure (Kola peninsula) using the MVP method. V interunion seminar on Electromagnetic Sounding, Mukachevo. "Naukova Dumka ", Kiev (In Russian)
Pavlovsky, B.l., Zhamaletdinov, A.A. (1982) Geological results of MHD-soundings on the Kola Peninsula. In: Methods and results of geophysical research on the north-eastern part of the Baltic Shield, Apatity. Geol. Inst., Kola branch, AN SSSR (In Russian)
Pernu, T. (1973) Magnetotellurics in a study of the Earth's crust. In: Jatila, E. (Ed.) pp. 121-126, Geofysiikan paivat Helsingissa 29.-30.5.1973 (In Finnish)
Pirjola, R. (1983) On induction effects in geomagnetic variations at Nurmijarvi. Paper presented at the Symposium "The Geoelectric Model of the Baltic Shield", Oulu, Findland
Rasmussen, T., Pedersen, L.B., Zhang, P. (1983) Magnetotelluric measurements along the FENNOLORA profile. Paper presented at the Symposium "The Geoelectrical Model of the Baltic Shield", Oulu, Finland
Rokityansky, I.I., Kulik, S.N., Rokityanskaya, D.A. (1981) The Ladoga conductivity anomaly (in Russian). Geoph. J. AN Ukr. SSR 3/2:97-99
Rokityansky, I.I., Golod, M.I., Klabukov, B.N., Grishin, A.S. (1983) MTS in Central Karelia. Acta Geod. Geophys. Mont. Acad. Sci. Hung. 18 (In press)
Ruotoistenmaki, T. (1983) Multilayer interpretation of potential fields using Fourier amplitude spectra (in Finnish). Intern. Rep. Qt 6.2/1983/1, Dept. of Geophysics, Geol. Survey of Finland
Salop, L.J. (1983) Geological evolution of the Earth during the Precambrian. Springer-Verlag, Germany
Simonen, A. (1980) The Precambrian in Finland. Geo I. Survey of Finland, Bull. 304
Vanyan, L.L., Berdichevsky, M.N., Yasin, N.D., Okulesski, Shilovsky, P.P. (1980) On the normal geoelectric profile. Earth Physics, Izv.AN SSSR 16/2:73-76
Vanyan, L.L., Berdichevsky, M.N., Fainberg, E.B., Fiskina, M.V. (1977) The study of the asthenosphere of the East European platform by electromagnetic sounding. Phys. Earth Planet. Int. 14:P1-P2
Velikhov, E.P., Gorbunov, G.I., Belkov, I.V., Volkov, Ju.M., Pavlovsky, V.l., Dreizin, Ju.A., Jevstigneyev, V.V., Zhamaletdinov, A.A., Katchevlin, P.L., Kuksa, Ju.I., Lisin, A.S. (1982) Geological results of the use of the MHD-generator on the Kola Peninsula and tasks for future research. (in Russian) In: Deep electromagnetic sounding with the use of impulses of MHD-generator: pp. 26-35, Izd. Kola branch AN SSSR, Apatity
Velikhov, E.P., Gorbunov, G.I., Volkov, Ju. M., Shukov, B.P., Vanyan, L.L., Demidova, T., Zhamaletdinov, A.A., Hjelt, S.E., Heikka, J. (1983) First Soviet-Finnish experiment of registering the signals from a MHD-generator, (in Russian). Dokl. AN SSSR 271:324-327
Vladimirov, N.P. (1971) Certain results of deep magnetotelluric soundings in the western part of the USSR. Phys. Solid Earth, Izv.AN SSSR, no 1:116-119
Westerlund, S. (1972) Magnetotelluric experiments in the frequency range 0.01 Hz to 10 kHz. KGO Rep. No. 72:10, Kiruna Geophysical Observatory
Yagin, S.A., Dobrovolskaya, M.A., Kovtun, A.A., Kokvina, E.L., Porokhova, L.N., Chicherina, H.D. (1982) The Ladoga anomaly of crustal electrical conductivity (in Russian). Problems of Geophysics. Vol. 29, no 407:15-19. Leningrad Univ. Press
Yasin, N.D. (1979) Personal communication.
Yasin, N.D., Novitsky, G.P., Suvarov, E.A. (1981) Results of work with the methods of magnetotelluric profiling (MTP) and telluric currents (TT) in the north-western part of the Kola peninsula (in Russian) Geophysical Research on the Baltic Shield
Zhamaletdinov, A.A., Pavlovsky, V.I. (1976) The effect of electrically conducting formations on results of magnetotelluric soundings on shields (in Russian). In: Proc. IV seminar of Electromagnetic
Sounding, Pt II, pp. 116-117, Zvenigorod 1976, MGU
Zhamaletdinov, A.A., Kulik, S.N., Pavlovsky, V.I., Rokityansky, I.I., Takachev, G.S. (1979) Anomaly of short period geomagnetic variations over the Imandra-Varzuga structure (Kola peninsula), (in Russian). Geoph. J. AN Ukr. SSR, 2/1:91-96
Zhamaletdinov, A.A. (1980) Electron-conducting structures of the North-West of the Kola peninsula and their influence on the results of deep soundings of the Earth's crust. Geod. Geoph. Veroff. Nat. Komm. f. Geod. u. Geoph. bei der Akad. der Wiss. DDR - Reihe III, Heft 47:207-223
Zhang, P., Rasmussen, T., Korja, T., Koivukoski, K. (1983) Preliminary results from a MT study of a conductive zone in Finland. Paper presented at the Symposium "The Geoelectrie Model of the Baltic Shield", Oulu, Finland
Berthelsen, A. (1983) The tectonic division of the Baltic Shield. Paper presented at the 1st Workshop on the European Geotraverse, Northern Segment, Copenhagen
Gaal, G. (1981) Proterozoic tectonic evolution and late Svecokarelian plate deformation of the Central Baltic Shield. Geol. Rundschau 71:(1)
Golod, M.I., Grishin, A.S., Klabukov, B.N. (1980) On the deep structure of Northern Karelia (in Russian). Methods and results of geophysical research in the north-eastern part of the Baltic Shield, Apatity, Geol. Inst., Kola branch, AN SSSR
Golod, M.I., Klabukov, A.N., Grishin, A.S. (1983) Geoelectrical model of the central part of Karelia. Paper presented at the Symposium "The Geoelectric Model of the Baltic Shield", Oulu, Finland
Gorbunov, G.I., Belkov, I.V., Pavlovsky, V.I., Zhamaletdinov, A.A., Kachevlin, P.L., Kachlev, Ju.P., Velikhov, E.P., Volkov, Ju.M., Dreizin, Ju.A., Kuksa, Ju.I., Zotov, A.B., Jevstigneyev, V.V., Lisin, A.S., Shukov, B.P., Vengersky, V.V., Babakov, Ju.P. (1979) Deep electromagnetic sounding with the MHD-generator on the Kola peninsula (in Russian). Dokl. AN SSSR, 247/3:578-582
Gorbunov, G.l., Belkov, I.V., Pavlovsky, V.l., Zhamaletdinov, A.A., Velikhov, E.P., Volkov, Ju.M., Dreizin, Ju.A. (1982) On the character of the electrical conductivity of the Earth's crust of the Kola Peninsula obtained from soundings with the MHD-generator. Geomagnetic Researches No 28, Moskva, "Radio i Svyaz" (In Russian)
Heikka, J., Zhamaletdinov, A., Demidova, T.A., Hjelt, S.E. (1983) MHD test registrations in Northern Finland. Paper presented at the IUGG XVIII General Assembly, Hamburg
Jones, A.G. (1980) Geomagnetic induction studies in Scandinavia. I Determination of the inductive response function from the magnetometer array data. J. Geophys. 48:181-194
Jones, A.G. (1981a) Geomagnetic induction studies in Scandinavia. II. Geomagnetic depth sounding, Induction vectors and coast-effect. J. Geophys. 50:23-36
Jones, A.G. (1981b) On a type classification of lower crustal layers under Precambrian regions. J. Geophys. 49:226-233
Jones, A.G. (1982a) On the electrical crust-mantle structure in Fennoscandia: No Moho, and the asthenosphere revealed? Geophys. J. R. Astron. Soc. 68:371-388
Jones, A.G. (1982b) Observations of the electrical asthenophere beneath Scandinavia. Tectonophysics 90:37-55
Jones, A.G., Olafsdottir, B., Tiikkainen, J. (1983) Geomagnetic induction studies in Scandinavia. - III Magnetotelluric observations. J. Geophys. 54:35-50
Jones, A.G. (1984) The electrical structure of the lithosphere and asthenosphere beneath the Fennoscandian shield. J. Geomagn. Geoelectr. (In press)
Kaikkonen, P. (1983) Numerical thin sheet modelling of magnetotelluric field distortions by the hybrid technique. IV Results for the Baltic Shield. Paper presented at the IUGG XVIII General Assembly, Hamburg
Kaikkonen, P., Vanyan, L.L., Hjelt, S.E., Shilovsky, A.P., Pajunpaa, K., Shilovsky, P.P. (1983) A preliminary geoelectrical model of the Karelian megablock of the Baltic Shield. Phys. Earth Planet.
Inter. 32:301-305
Kaikkonen, P., Pajunpaa, K. (1984) Audiomagnetotelluric measurements across the Lake Ladoga-Bothnian Bay zone in Central Finland. Gephys. J. R. Astron Soc. 78 (In press)
Korja, T. (1983) On magnetotelluric measurements in Finland. Paper presented at the Symposium "The Geoelectric Model of the Baltic Shield", Oulu, Finland
Kovtun, A.A. (1976) Induction studies in stable shield and platform areas. Acta Geod. Geophys. Mont. Acad. Sci. Hung. 11/3-4:333-346
Krasnobayeva, A.G., Dyakonov, B.P., Astafyev, P.F., Batalova, O.V., Vishnev, V.S., Gavrilova, I.E., Zhuravleva, P.B., Kirillov S.K. (1981) Structure of the northeastern part of the Baltic Shield, based on magnetotelluric data. Earth Physics, Izv. AN SSSR 17/6
Krasnobayeva, A.G., Dyakonov, B.P., Astafyev, P.F., Batalova, O.V., Vishnev, V.S., Gavrilova, I.E., Zhuravlova, P.B., Kirillov, S.K. (1982) Magnetotelluric data on the geoelectric structure in the
northeastern part of the Baltic Shield. Acta Geod Geophys. Mont. Acad. Sci. Hung. 17/2:255-265
Krasnobayeva, A.G., Dyakonov, B.P., Skachkov, P.P. (1983) Results of electromagnetic investigations on the Murmansk block of the Baltic Shield. Paper presented at the Symposium "The Geoelectric Model of the Baltic Shield", Oulu, Finland
Kuppers, F., Untiedt, J., Baumjohann, W., Lange, K., Jones, A.G. (1979) A two-dimensional magnetometer array for ground-based observationsof auroral zone electric currents during the International
Magnetospheric Study (IMS). J. Geophys. 46:429-450
Lange, K. (1979) Induktionseffekte in Nordskandinavien - untersucht am Beispiel zweier ostwarts flieBender polarer Elektrojets. Diplomarbeit, Munster Univ.
Luosto, U., Lanne, E., Korhonen, H., Guterch, A., Grad, M., Materzok, R., Pajchel, J., Perchuc, E., Yliniemi, J. (1982) Results of the Deep Seismic Sounding of the Earth's crust on the profile SVEKA. Proc. of the 18th General Ass. of ESC, Leeds (In press)
Pajunpaa, K. (1984) Magnetometer array studies in Finland - determination of single station transfer function. J. Geophys. (In press)
Pajunpaa, K., Heikka, J., Korja, T. (1984) Magnetometer array studies in Finland, J. Geomagn. Geoelectr. (In press)
Pavlovsky, B.l., Zhamaletdinov, A.A., Takachev, G.S., Rokityansky, I.I., Kulik, S.N. (1978) On the results of search for conductivity anomalies of the Imandra-Varzuga structure (Kola peninsula) using the MVP method. V interunion seminar on Electromagnetic Sounding, Mukachevo. "Naukova Dumka ", Kiev (In Russian)
Pavlovsky, B.l., Zhamaletdinov, A.A. (1982) Geological results of MHD-soundings on the Kola Peninsula. In: Methods and results of geophysical research on the north-eastern part of the Baltic Shield, Apatity. Geol. Inst., Kola branch, AN SSSR (In Russian)
Pernu, T. (1973) Magnetotellurics in a study of the Earth's crust. In: Jatila, E. (Ed.) pp. 121-126, Geofysiikan paivat Helsingissa 29.-30.5.1973 (In Finnish)
Pirjola, R. (1983) On induction effects in geomagnetic variations at Nurmijarvi. Paper presented at the Symposium "The Geoelectric Model of the Baltic Shield", Oulu, Findland
Rasmussen, T., Pedersen, L.B., Zhang, P. (1983) Magnetotelluric measurements along the FENNOLORA profile. Paper presented at the Symposium "The Geoelectrical Model of the Baltic Shield", Oulu, Finland
Rokityansky, I.I., Kulik, S.N., Rokityanskaya, D.A. (1981) The Ladoga conductivity anomaly (in Russian). Geoph. J. AN Ukr. SSR 3/2:97-99
Rokityansky, I.I., Golod, M.I., Klabukov, B.N., Grishin, A.S. (1983) MTS in Central Karelia. Acta Geod. Geophys. Mont. Acad. Sci. Hung. 18 (In press)
Ruotoistenmaki, T. (1983) Multilayer interpretation of potential fields using Fourier amplitude spectra (in Finnish). Intern. Rep. Qt 6.2/1983/1, Dept. of Geophysics, Geol. Survey of Finland
Salop, L.J. (1983) Geological evolution of the Earth during the Precambrian. Springer-Verlag, Germany
Simonen, A. (1980) The Precambrian in Finland. Geo I. Survey of Finland, Bull. 304
Vanyan, L.L., Berdichevsky, M.N., Yasin, N.D., Okulesski, Shilovsky, P.P. (1980) On the normal geoelectric profile. Earth Physics, Izv.AN SSSR 16/2:73-76
Vanyan, L.L., Berdichevsky, M.N., Fainberg, E.B., Fiskina, M.V. (1977) The study of the asthenosphere of the East European platform by electromagnetic sounding. Phys. Earth Planet. Int. 14:P1-P2
Velikhov, E.P., Gorbunov, G.I., Belkov, I.V., Volkov, Ju.M., Pavlovsky, V.l., Dreizin, Ju.A., Jevstigneyev, V.V., Zhamaletdinov, A.A., Katchevlin, P.L., Kuksa, Ju.I., Lisin, A.S. (1982) Geological results of the use of the MHD-generator on the Kola Peninsula and tasks for future research. (in Russian) In: Deep electromagnetic sounding with the use of impulses of MHD-generator: pp. 26-35, Izd. Kola branch AN SSSR, Apatity
Velikhov, E.P., Gorbunov, G.I., Volkov, Ju. M., Shukov, B.P., Vanyan, L.L., Demidova, T., Zhamaletdinov, A.A., Hjelt, S.E., Heikka, J. (1983) First Soviet-Finnish experiment of registering the signals from a MHD-generator, (in Russian). Dokl. AN SSSR 271:324-327
Vladimirov, N.P. (1971) Certain results of deep magnetotelluric soundings in the western part of the USSR. Phys. Solid Earth, Izv.AN SSSR, no 1:116-119
Westerlund, S. (1972) Magnetotelluric experiments in the frequency range 0.01 Hz to 10 kHz. KGO Rep. No. 72:10, Kiruna Geophysical Observatory
Yagin, S.A., Dobrovolskaya, M.A., Kovtun, A.A., Kokvina, E.L., Porokhova, L.N., Chicherina, H.D. (1982) The Ladoga anomaly of crustal electrical conductivity (in Russian). Problems of Geophysics. Vol. 29, no 407:15-19. Leningrad Univ. Press
Yasin, N.D. (1979) Personal communication.
Yasin, N.D., Novitsky, G.P., Suvarov, E.A. (1981) Results of work with the methods of magnetotelluric profiling (MTP) and telluric currents (TT) in the north-western part of the Kola peninsula (in Russian) Geophysical Research on the Baltic Shield
Zhamaletdinov, A.A., Pavlovsky, V.I. (1976) The effect of electrically conducting formations on results of magnetotelluric soundings on shields (in Russian). In: Proc. IV seminar of Electromagnetic
Sounding, Pt II, pp. 116-117, Zvenigorod 1976, MGU
Zhamaletdinov, A.A., Kulik, S.N., Pavlovsky, V.I., Rokityansky, I.I., Takachev, G.S. (1979) Anomaly of short period geomagnetic variations over the Imandra-Varzuga structure (Kola peninsula), (in Russian). Geoph. J. AN Ukr. SSR, 2/1:91-96
Zhamaletdinov, A.A. (1980) Electron-conducting structures of the North-West of the Kola peninsula and their influence on the results of deep soundings of the Earth's crust. Geod. Geoph. Veroff. Nat. Komm. f. Geod. u. Geoph. bei der Akad. der Wiss. DDR - Reihe III, Heft 47:207-223
Zhang, P., Rasmussen, T., Korja, T., Koivukoski, K. (1983) Preliminary results from a MT study of a conductive zone in Finland. Paper presented at the Symposium "The Geoelectrie Model of the Baltic Shield", Oulu, Finland