Electromagnetic sounding experiments in the Schwarzwald central gneiss massif
Article Sidebar
Main Article Content
Abstract
Geomagnetic and telluric pulsations were observed at nine stations, partially at the same time, and at two sites with additional recordings of variations. They occupied a 20 x 30 km2 area of high-grade metamorphism. There is a nearly perfect spatial uniformity of the magnetic variation field except for a small local anomaly attributable to the Rheingraben. The telluric field is highly polarized in a N47 ± 7W direction but with local differences in amplitude. In contrast, telluric phases are spatially uniform and, as a function of period, distinctly different for the N47W orientation of the telluric field (= "B-polarisation") and the N43E orientation (= "E-polarisation"). Telluric and magnetic observations are not explainable by one-dimensional (1-D) models for the Schwarzwald alone. Therefore a 2-D model is derived, comprising Schwarzwald and Rheingraben, which can account for the graben Z anomaly and the phase curves in both polarisations. An unscaled 1-D model is obtained from the telluric phases in E-polarisation and then a 2-D model for Schwarzwald and Rheingraben in E- and B-polarisation. This latter model allows the scaling of the 1-D Schwarzwald model and shows a thin conductive layer under the gneiss massif at a depth of 12 km with a conductance of 650 S.
ARK: https://n2t.net/ark:/88439/y056011
Permalink: https://geophysicsjournal.com/article/121
Article Details
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.
Author Self-archiving
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).
Additional Notes
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...)
References
Richards, M.L., Schmucker, U., Steveling, E., Watermann, J. (1981) Erdmagnetische und magnetotellurische Sondierungen im Gebiet des mitteleuropaischen Riftsystem. Forschungsbericht T81-III, Bundesministerium fur Forschung und Technologie, Bonn
Schmucker, U. (1978) Auswertungsverfahren Goettingen. Protokoll Kolloquium Elektromagnetische Tiefenforschung. Neustadt/Weinstrase, 163-188
Schmucker, U. (1979) Erdmagnetische Variationen und die elektrische Leitfahigkeit in tieferen Schichten der Erde. Sitzungsberichte und Mitteilungen der Braunschweigischen Wissenschaftlichen
Gesellschaft. Sonderheft 4, Goltze Verlag, Goettingen, 45-102
Schmucker, U., Weidelt, P. (1975) Electromagnetic induction in the Earth. Lecture notes, Aarhus
Schmucker, U., Tezkan, B. (1985) Erdmagnetische und tellurische Untersuchungen im Schwarzwald. Bericht zum Unterantrag der Univ. Karlsruhe zum BMFT Forderungsvorhaben R683146, Inst. f. Geophysik, Univ. Goettingen
Swift, C.M. (1967) A magnetotelluric investigation of an electrical conductivity anomaly in South Western United States. Ph.D. Thesis, M.I.T., Cambridge, Mass.
Teufel, U. (1986) Die Verteilung der elektrischen Leitfahigkeit in der Erdkruste unter dem Schwarzwald, ein Beispiel fur Moglichkeiten und Grenzen der Interpretation von Audio-Magnetotellurik,
Magnetotellurik, Erdmagnetischer Tiefensondierung. Diss. Fak. f. Geowissenschaften der Ludwig Maximilian University Munich
Tezkan, B. (1984) Einflus von Graphitgangen auf EM-Sondierungen mit Pulsationen im sudostlichen Bayerischen Wald. Protokoll Kolloquium Elektromagnetische Tiefenforschung, Grafrath, 145-152
Tezkan, B. (1986) Erdmagnetische und magnetotellurische Untersuchungen auf den hochohmigen Kristallinstrukturen des Hochschwarzwaldes und des Bayerischen Waldes bei Passau. Diss. Math.-Nat. Fak., Univ. Goettingen
Winter, R. (1973) Der Oberrheingraben als Anomalie der elektrischen Leitfahigkeit, untersucht mit Methoden der erdmagnetischen Tiefensondierung. Diss. Math.-Nat.Fak., Univ. Goettingen