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| Titel |
Improving of electrical channels for magnetotelluric sounding instrumentation |
| VerfasserIn |
A. M. Prystai, V. O. Pronenko |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
2193-0856
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Instrumentation, Methods and Data Systems ; 4, no. 2 ; Nr. 4, no. 2 (2015-07-30), S.149-154 |
| Datensatznummer |
250115242
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| Publikation (Nr.) |
 copernicus.org/gi-4-149-2015.pdf |
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| Zusammenfassung |
| The study of the deep structure of the Earth's crust is of great interest for
both applied (e.g. mineral exploration) and scientific research. For this the
electromagnetic (EM) studies which enable one to construct the distribution
of electrical conductivity in the Earth's crust are of great use. The most
common method of EM exploration is magnetotelluric sounding (MT). This
passive method of research uses a wide range of natural geomagnetic
variations as a powerful source of electromagnetic induction in the Earth,
producing telluric current variations there. It includes the measurements of
variations of natural electric and magnetic fields in orthogonal directions
at the surface of the Earth. By this, the measurements of electric fields are
much more complicated metrological processes, and, namely, they limit the
precision of MT prospecting. This is especially complicated at deep sounding
when measurements of long periods are of interest. The increase in the
accuracy of the electric field measurement can significantly improve the
quality of MT data. Because of this, the development of a new version of an
instrument for the measurements of electric fields at MT – both electric
field sensors and the electrometer – with higher levels relative to the
known instrument parameter level – was initiated. The paper deals with the
peculiarities of this development and the results of experimental tests of
the new sensors and electrometers included as a unit in the long-period
magnetotelluric station LEMI-420 are given. |
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