Main Article Content
Magnetotelluric measurements were made at 12 sites on a 210 km long profile in northern and eastern Iceland. The profile crosses areas of different geological age ranging from Tertiary flood basalt to the presently active zone of rifting and volcanism. Beneath the investigated area, at a depth of a few km down to about 20 km there exists a 5 km thick layer with low resistivity amounting to 15 Ωm which is imbedded between layers of higher resistivities. The depth to the low resistivity layer increases with increasing distance from the spreading axis. The low resistivity layer is presumably caused by partial melting at the base of the crust and at the top of the anomalous mantle beneath Iceland. Comparison with laboratory measurements confirms a basaltic composition and a temperature of 1,000-1,100° C of the good conductor, and probably partially molten peridotite in the upper mantle beneath. Mean temperature gradients in the crust calculated from the magnetotelluric data are in good agreement to surface temperature gradients measured in drill holes.
Authors who publish with this journal as of Vol. 63 agree to the following terms:
a. Authors share the copyright with this journal in equal parts (50% to the journal, 50% to the lead author), and grant the journal right of first publication, with the work after publication simultaneously licensed under Creative Commons Attribution License CC BY-NC-ND 4.0 that allows others to share the work with an acknowledgment of the work's authorship and initial publication in this journal.
b. Authors may enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgment of its initial publication in this journal, and a reference to this copyright notice.
c. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) during the submission process, as this can lead to productive exchanges and earlier and greater citation of published work and better sales of the copyright.
Authors retain copyright and grant the Journal of Geophysics right of first publication, with the work three years after publication simultaneously licensed under the Creative Commons BY-NC-ND 4.0 License that allows others to share the work (with an acknowledgment of the work's authorship and initial publication in this journal), except for commercial purposes and for creating derivatives.
Authors can enter into separate, additional, but non-commercial contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository, but not publish it in a book), with an acknowledgment of its initial publication in this journal.
Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) before and during the submission process, as that can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
This journal is one of a handful of scholarly journals that publish original scientific works under CC BY-NC-ND 4.0 - the only Creative Commons license affording the authors' intellectual property absolute worldwide protection.
Journal of Geophysics is published under the scholar-publishers model, meaning authors do not surrender their copyright to us. Instead, and unlike corporate publishers like Elsevier or Springer Nature that resell copyright to third-parties for up to $80,000 (per paper, per transaction!), the Journal of Geophysics authors share copyright equally with this journal.
Therefore, all the proceeds from reselling copyright to third parties get shared to equal parts (50% to the journal, 50% to the lead author). Under the Berne Convention, this protection is an inheritable right that lasts for as long as the rightsholder lives + 50 years.
By submitting to this journal, the lead author, on behalf of all co-authors, grants permission to this journal to represent all co-authors in negotiating copyright sales and collecting proceeds. The lead author should negotiate with his/her co-authors the modalities of distributing the lead author's portion of the proceeds. Usually, this is per pre-agreed percentage of each co-author's contribution to creating the copyrighted work. (more...)
Beblo, M. (1972) A transportable battery-operated electrograph for permanent recording of the induced electric field of the earth. J. Geophys. 38:133-143
Beblo, M. (1974) Die elektrische Leitfahigkeit unter den Ostalpen, abgeleitet aus magnetotellurischen Messungen langs eines Profiles vom Alpennordrand bis zu den Hohen Tauern. Diss. Fak. Geowiss. Univ. Munich
Berdichevsky, M.N., Dimitriev, V.J. (1976) Basic principles of interpreation of magnetotelluric sounding curves. In: Adam, A. (Ed.) Geoelectric and geothermal studies, pp. 165-221. Budapest: Akademiai Kiado
Berktold, A., Beblo, M., Kemmerle, K. (1976) On the distribution of the electrical conductivity below the Eastern Alps. Geol. Rundschau 65:715-732
Bjornsson, A. (1976) Electrical resistivity of layer 3 in the Icelandic crust. In: Greinar V. pp. 7-23, Reykjavik: Societas Scientiarum Islandica
Bjornsson, A., Saemundsson, K., Einarsson, P., Tryggvason, E., Granvold, K. (1977) Current rifting episode in north Iceland. Nature 266:318-323
Bondarenko, A.T., Galdin, N.Y. (1972) On the physicomechanical and electrical properties of basalts at high pressures and temperatures. Izv. Earth Phys. 5:28-40
Garland, G.D., Ward, J. (1965) Magnetic variation measurements in Iceland. Nature 205:269-270
Haak, V. (1978) Interpretations-Verfahren fur die Magnetotellurik unter besonderer Berucksichtigung lateral variierender elektrischer Leitfahigkeit im Erdinnern und eines raumlich inhomogenen
induzierenden Magnetfelds. Munich: Bayerische Akademie der Wissenschaften
Hermance, J.F. (1973) An electrical model for the sub-Icelandic crust. Geophysics 38:3-13
Hermance, J.F., Garland, G.D. (1968a) Deep electrical structure under Iceland. J. Geophys. Res. 73:3797-3800
Hermance, J.F., Garland, G.D. (1968b) Magnetotelluric deepsounding experiments in Iceland. Earth Planet. Sci. Lett. 4:469-474
Hermance, J.F., Grillot, L.R. (1970) Correlation of magnetotelluric, seismic and temperature data from southwest Iceland. J. Geophys. Res. 75:6582-6591
Hermance, J.F., Grillot, L.R. (1974) Constraints on temperatures beneath Iceland from magnetotelluric data. Phys. Earth Planet. Inter. 8:1-12
Hermance, J.F., Nur, A., Bjornsson, S. (1972) Electrical properties of basalt: relation of laboratory to in situ measurements. J. Geophys. Res. 77:1424-1429
Hermance, J.F., Thayer, R.E., Bjornsson, A. (1975) The telluric-magnetotelluric method in the regional assessment of geothermal potential. In: Proceedings, Second United Nations Symp. on the development and use of geothermal resources, San Francisco, pp. 1037-1048. Berkeley-San Francisco: Lawrence Berkeley Lab., Univ. of California
Kiessling, W. (1970) Untersuchung der Variationen des erdelektrischen und erdmagnetischen Feldes im Oberpfalzer Wald zur Bestimmung der elektrischen Leitfahigkeit in grol3eren Tiefen mit der Methode der Magnetotellurik. Dipl.-Arbeit, Inst. Angew. Geophys. Univ. Munich
Kitharov, N.I., Slutskiy, A.B., Pugin, A.V. (1970) Electrical conductivity of basalts at high T-P and phase transitions under upper mantle conditions. Phys. Earth Planet. Inter. 3:334-342
Palmason, G. (1971) Crustal structure of Iceland from explosion seismology. Rit XL, Reykjavik: Societas Scientiarum Islandica. pp. 187
Palmason, G. (1973) Kinematics and heat flow in a volcanic rift zone with application to Iceland. Geophys. J. 33:451-481
Palmason. G., Saemundsson, K. (1974) Iceland in the relation to the Mid-Atlantic Ridge. Ann. Rev. Earth Planet. Sci. 2:25-50
Parkhomenko, E.I. (1967) Electrical properties of rocks. Plenum, New York
Presnall, D.C., Simmons, C.L., Porath, H. (1972) Changes in electrical conductivity of a synthetic basalt during melting. J. Geophys. Res. 77:5665-5672
Saemundsson, K. (1974) Evolution of the axial rifting zone in northern Iceland and the Tjornes fracture zone. Hull. Geol. Soc. Am. 85:495-504
Schmucker, U. (1974) Erdmagnetische Tiefensondierung mit langperiodischen Variationen. In: Tiefensond, A. Berktold (Ed.) Protokoll DFG-Kolloquium Erdmagn, pp. 313-342, Grafrath-Munich
Shankland, T.J., Waff, H.S. (1977) Partial melting and electrical conductivity anomalies in the upper mantle. J. Geophys. Res. 82:5409-5417
Thayer, R.E. (1975) Telluric-magnetotelluric investigations of regional geothermal processes in Iceland. Ph.D. thesis, Providence: Dept. Geological Sciences, Brown University
Waff, S.H. (1974) Theoretical considerations of electrical conductivity in a partially molten mantle and implications for geothermometry. J. Geophys. Res. 79:4003-4010
Zverev, S.M., Boldyrev, S.A., Bourmin, V. Yu, Mironova, V.I. (1978) Weak earthquakes in the northern part of the rift zone of Iceland. J. Geophys. 44:283-296
Most read articles by the same author(s)
- G.Y. Johnsen, A. Bjornsson, S. Sigurdsson, Gravity and elevation changes caused by magma movement beneath the Krafla Caldera, Northeast Iceland , Journal of Geophysics: Vol 47 No 1 (1980): Journal of Geophysics
- M. Beblo, K. Arnason, B. Stein, A. Bjornsson, P. Wolfgram, Electrical conductivity beneath Iceland - constraints imposed by magnetotelluric results on temperature, partial melt, crust- and mantle structure , Journal of Geophysics: Vol 53 No 1 (1983): Journal of Geophysics