Electromagnetic profiling interpretation across vertical faults and dikes

Detalhes bibliográficos
Autor(a) principal: Sampaio, Edson E. S.
Data de Publicação: 2001
Outros Autores: Dias, Carlos A.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/7770
Resumo: Texto completo: acesso restrito. p. 107–119
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spelling Sampaio, Edson E. S.Dias, Carlos A.Sampaio, Edson E. S.Dias, Carlos A.2013-01-07T15:32:03Z20010016-8025http://www.repositorio.ufba.br/ri/handle/ri/7770v. 49, n. 1Texto completo: acesso restrito. p. 107–119When a vertical fault or dike scatters a normally incident TE-mode plane wave, the horizontal components of the electric and the magnetic fields vary along the direction perpendicular to the strike. This scattering is also responsible for the formation of a vertical component of the magnetic field, which also varies along the direction perpendicular to the strike. Analysis of the lateral variations of the field components permits the identification of the type of geological structure, either fault or dike, as well as an estimate of the position of the geological contacts and the electrical conductivity of each medium. Previous exact analytical solutions have shown that two Fourier cosine integrals can express each field component. A series of functions specified for each model represent the kernel of each integral. From the field components obtained from the first non-zero term of each series, we calculated the following functions: the dip angle and the ellipticity of the vertical polarization ellipse in a plane perpendicular to the strike of the structure, and the azimuth and the ellipticity of the horizontal ellipse. We established master-curves of these functions for the interpretation of vertical faults and dikes for the polarization ellipsoid, for instance VLF or audio-frequency methods. This representation has as variable the induction number inline image, and as parameters σ2/σ1 and inline image, where a denotes the half-thickness of the dike. The interpretation procedure using curve fitting is possible because the induction number is represented on a logarithmic scale. This procedure represents an important step before automatic interpretation is carried out. Two case histories using field data illustrate the effectiveness of the procedure and the type of quantitative interpretation obtained from it.Submitted by Suelen Reis (suelen_suzane@hotmail.com) on 2013-01-07T15:32:03Z No. of bitstreams: 1 Sampaio.pdf: 998583 bytes, checksum: a9cf97319fe9dc9dac24dbdede581a1d (MD5)Made available in DSpace on 2013-01-07T15:32:03Z (GMT). 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dc.title.pt_BR.fl_str_mv Electromagnetic profiling interpretation across vertical faults and dikes
dc.title.alternative.pt_BR.fl_str_mv Geophysical Prospecting
title Electromagnetic profiling interpretation across vertical faults and dikes
spellingShingle Electromagnetic profiling interpretation across vertical faults and dikes
Sampaio, Edson E. S.
title_short Electromagnetic profiling interpretation across vertical faults and dikes
title_full Electromagnetic profiling interpretation across vertical faults and dikes
title_fullStr Electromagnetic profiling interpretation across vertical faults and dikes
title_full_unstemmed Electromagnetic profiling interpretation across vertical faults and dikes
title_sort Electromagnetic profiling interpretation across vertical faults and dikes
author Sampaio, Edson E. S.
author_facet Sampaio, Edson E. S.
Dias, Carlos A.
author_role author
author2 Dias, Carlos A.
author2_role author
dc.contributor.author.fl_str_mv Sampaio, Edson E. S.
Dias, Carlos A.
Sampaio, Edson E. S.
Dias, Carlos A.
description Texto completo: acesso restrito. p. 107–119
publishDate 2001
dc.date.issued.fl_str_mv 2001
dc.date.accessioned.fl_str_mv 2013-01-07T15:32:03Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/7770
dc.identifier.issn.none.fl_str_mv 0016-8025
dc.identifier.number.pt_BR.fl_str_mv v. 49, n. 1
identifier_str_mv 0016-8025
v. 49, n. 1
url http://www.repositorio.ufba.br/ri/handle/ri/7770
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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instname:Universidade Federal da Bahia (UFBA)
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