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Abstract:

Magnetic-field noise biases magnitudes of magnetotelluric response functions such as resistivity, impedance, and the induction vector (tipper). This is particularly severe in the so-called dead band between about 1- and 10-s periods. The standard approach to remove these biases is to use a magnetic remote reference. In cases where this is unavailable or does not work because noise is correlated at the local and remote sites, it is possible to extract unbiased estimates using an inversion algorithm that predicts the magnitude from the phase. However, an important condition for this to be successful is that phase estimates are unbiased. Phase can be biased if parallel components of the electric and magnetic fields are correlated. This arises when the structure is 3D or when a 2D response is estimated in coordinates not parallel to strike. Improvements in electric field measurements make electric field references a viable option for estimating low-bias responses up to periods approaching 1000 s. © 2009 Society of Exploration Geophysicists. All rights reserved.

Registro:

Documento: Artículo
Título:A discussion of bias in magnetotelluric responses
Autor:Pomposiello, M.C.; Booker, J.R.; Favetto, A.
Filiación:Ciudad Universitaria, Instituto de Geocronolgía y Geología, CONICET, Buenos Aires, Argentina
University of Washington, Department of Earth and Space Sciences, Seattle, WA, United States
Palabras clave:Electric fields; Magnetic fields; Magnetism; Magnetotellurics; Electric and magnetic fields; Induction vectors; Inversion algorithm; Magnetic field noise; Parallel component; Remote sites; Response functions; Unbiased estimates; Electric variables measurement; algorithm; correlation; data inversion; electromagnetic field; estimation method; magnetotelluric method; measurement method
Año:2009
Volumen:74
Número:4
Página de inicio:F59
Página de fin:F65
DOI: http://dx.doi.org/10.1190/1.3147132
Título revista:Geophysics
Título revista abreviado:Geophysics
ISSN:00168033
CODEN:GPYSA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00168033_v74_n4_pF59_Pomposiello

Referencias:

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Citas:

---------- APA ----------
Pomposiello, M.C., Booker, J.R. & Favetto, A. (2009) . A discussion of bias in magnetotelluric responses. Geophysics, 74(4), F59-F65.
http://dx.doi.org/10.1190/1.3147132
---------- CHICAGO ----------
Pomposiello, M.C., Booker, J.R., Favetto, A. "A discussion of bias in magnetotelluric responses" . Geophysics 74, no. 4 (2009) : F59-F65.
http://dx.doi.org/10.1190/1.3147132
---------- MLA ----------
Pomposiello, M.C., Booker, J.R., Favetto, A. "A discussion of bias in magnetotelluric responses" . Geophysics, vol. 74, no. 4, 2009, pp. F59-F65.
http://dx.doi.org/10.1190/1.3147132
---------- VANCOUVER ----------
Pomposiello, M.C., Booker, J.R., Favetto, A. A discussion of bias in magnetotelluric responses. Geophysics. 2009;74(4):F59-F65.
http://dx.doi.org/10.1190/1.3147132