Physics
Scientific paper
Apr 1968
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1968pepi....1..148t&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 1, Issue 3, p. 148-150.
Physics
3
Scientific paper
The influence of the underground conductivity structure on the horizontal geomagnetic local gradient is discussed. The conductivity distribution is assumed to be two-dimensional with an infinite vertical boundary between the regions of different conductivity. In these cases the local gradient in geomagnetic variations increases discontinuously when crossing the boundary, and the magnitude of the increase is proportional to the difference of conductivities of the regions at both sides of the boundary. These circumstances make it possible to determine the conductivity difference by measuring the local gradient of geomagnetic variations and the telluric field. The limitations of the method are discussed. Furthermore, it is shown, that the telluric field should be measured over long rather than short paths.
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