Patella, Domenico (2009) The role of the impedivity in the magnetotelluric response. [Pubblicazione in rivista scientifica]

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Item Type: Pubblicazione in rivista scientifica
Language: English
Title: The role of the impedivity in the magnetotelluric response
Creators:
CreatorsEmail
Patella, DomenicoUNSPECIFIED
Autor/s: R. Esposito, D. Patella
Date: 2009
Number of Pages: 29
Department: Scienze fisiche
Identification Number: 10.2528/PIER08121203
Journal or Publication Title: ELECTROMAGNETIC WAVES
Date: 2009
Volume: 89
Page Range: pp. 225-253
Number of Pages: 29
Identification Number: 10.2528/PIER08121203
Date Deposited: 21 Oct 2010 06:57
Last Modified: 30 Apr 2014 19:43
URI: http://www.fedoa.unina.it/id/eprint/7521

Abstract

We study the influence of the resistivity frequency dispersion effects on the magnetotelluric (MT) response. Impedivity is the term used to indicate the frequency dependent resistivity in rocks. The impedivity functions, used in this paper, have been derived from the general solution of the motion equation of a charge carrier, discussed in a previous paper. A 1D three-layered earth section, with the second layer assumed to be dispersive, is considered to analyze the distortions due to dispersion on the modulus and phase of the MT responses on the earth’s free surface. The MT responses of the section, where the dispersive layer is attributed an impedivity function describing at first a positive, then a negative and finally a resonant dispersion model, are computed for various combines of the dispersion parameters. A general conclusion is that the dispersion effects can strongly influence the MT response either in recognizable or in subtle forms. In the former case, the distortions appear as either steeply rising and/or descending curve branches or spike-like deltas, not compatible with a dispersion-free section. In the latter case, instead, the MT curves preserve the typical behavior for a dispersion-free section, and may thus erroneously be modeled by a section, where the dispersive layer is totally suppressed. In both case, disregarding the distortion effects may lead to misleading conclusions as to the physical properties of the surveyed structures.

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