Transient electric field response to a uniform, magnetically viscous earth excited by a grounded line source

E. Yu Antonov, N. O. Kozhevnikov

Research output: Contribution to journalArticlepeer-review

Abstract

A new method is suggested for calculation of transient electric field response to conducting magnetically viscous earth excited by a grounded line source. Calculation algorithms are implemented in the computer program FwLL_MV. Using a uniform, conducting magnetically viscous half-space as an earth model, we have shown that magnetic relaxation affects the TEM response of equatorial and in-line arrays. As in the case of loop arrays, apparent resistivity steadily decreases with time. The higher the half-space resistivity and the shorter the offset, the earlier the voltage and the apparent resistivity begin to decrease as 1/t. Magnetic relaxation and decay of eddy currents are independent processes within the range of resistivities typical of rocks. (C) 2017, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)855-863
Number of pages9
JournalRussian Geology and Geophysics
Volume58
Issue number7
DOIs
Publication statusPublished - 1 Jul 2017

Keywords

  • equatorial array
  • grounded line
  • magnetic viscosity
  • superparamagnetism
  • transient response
  • uniform earth
  • TEM RESPONSES
  • RELAXATION
  • VISCOSITY
  • LAYER
  • ELECTROMAGNETIC RESPONSE

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