Modelling electromagnetic responses of 2-D structures due to spatially non-uniform inducing fields. Analysis of magnetotelluric source effects at coastlines

Mostrar todas las versiones(3)

In previous works, we presented 2-D and 3-D magnetotelluric modelling methods based on Rayleigh-Fourier expansions. These methods are an alternative to finite-element and finite-difference techniques and are especially suitable for modelling multilayered structures, with smooth irregular boundaries....

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: Martinelli, P., Osella, A.
Formato: JOUR
Materias:
Daily variations
Geo-electromagnetic induction
Non-uniform inducing fields
Source effects
coastal morphology
electromagnetic method
induced polarization
magnetotelluric method
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0956540X_v155_n2_p623_Martinelli
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_0956540X_v155_n2_p623_Martinelli
record_format dspace
spelling todo:paper_0956540X_v155_n2_p623_Martinelli2023-10-03T15:52:04Z Modelling electromagnetic responses of 2-D structures due to spatially non-uniform inducing fields. Analysis of magnetotelluric source effects at coastlines Martinelli, P. Osella, A. Daily variations Geo-electromagnetic induction Non-uniform inducing fields Source effects coastal morphology electromagnetic method induced polarization magnetotelluric method In previous works, we presented 2-D and 3-D magnetotelluric modelling methods based on Rayleigh-Fourier expansions. These methods are an alternative to finite-element and finite-difference techniques and are especially suitable for modelling multilayered structures, with smooth irregular boundaries. Here we generalize the 2-D method for the calculation of the electromagnetic response of 2-D structures to arbitrary, spatially non-uniform 2-D and 3-D inducing magnetic fields. These fields are characteristic of low- and high-latitude regions. We calculate the response to different 2-D and 3-D sources, of a 2-D structure representative of the conductivity distribution which could be found at a coastline, which includes deep conductive anomalies in the lower crust and upper mantle. Then, we investigate source effects, comparing these responses to that obtained for a uniform source. These effects become noticeable for periods greater than approximately 6 h and increase with the period of the source. They are highly dependent on the morphology of the source and also on the orientation of the external field relative to the strike direction of the structure. In various cases, they totally mask the uniform source response. Fil:Osella, A. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0956540X_v155_n2_p623_Martinelli
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Daily variations
Geo-electromagnetic induction
Non-uniform inducing fields
Source effects
coastal morphology
electromagnetic method
induced polarization
magnetotelluric method
spellingShingle Daily variations
Geo-electromagnetic induction
Non-uniform inducing fields
Source effects
coastal morphology
electromagnetic method
induced polarization
magnetotelluric method
Martinelli, P.
Osella, A.
Modelling electromagnetic responses of 2-D structures due to spatially non-uniform inducing fields. Analysis of magnetotelluric source effects at coastlines
topic_facet Daily variations
Geo-electromagnetic induction
Non-uniform inducing fields
Source effects
coastal morphology
electromagnetic method
induced polarization
magnetotelluric method
description In previous works, we presented 2-D and 3-D magnetotelluric modelling methods based on Rayleigh-Fourier expansions. These methods are an alternative to finite-element and finite-difference techniques and are especially suitable for modelling multilayered structures, with smooth irregular boundaries. Here we generalize the 2-D method for the calculation of the electromagnetic response of 2-D structures to arbitrary, spatially non-uniform 2-D and 3-D inducing magnetic fields. These fields are characteristic of low- and high-latitude regions. We calculate the response to different 2-D and 3-D sources, of a 2-D structure representative of the conductivity distribution which could be found at a coastline, which includes deep conductive anomalies in the lower crust and upper mantle. Then, we investigate source effects, comparing these responses to that obtained for a uniform source. These effects become noticeable for periods greater than approximately 6 h and increase with the period of the source. They are highly dependent on the morphology of the source and also on the orientation of the external field relative to the strike direction of the structure. In various cases, they totally mask the uniform source response.
format JOUR
author Martinelli, P.
Osella, A.
author_facet Martinelli, P.
Osella, A.
author_sort Martinelli, P.
title Modelling electromagnetic responses of 2-D structures due to spatially non-uniform inducing fields. Analysis of magnetotelluric source effects at coastlines
title_short Modelling electromagnetic responses of 2-D structures due to spatially non-uniform inducing fields. Analysis of magnetotelluric source effects at coastlines
title_full Modelling electromagnetic responses of 2-D structures due to spatially non-uniform inducing fields. Analysis of magnetotelluric source effects at coastlines
title_fullStr Modelling electromagnetic responses of 2-D structures due to spatially non-uniform inducing fields. Analysis of magnetotelluric source effects at coastlines
title_full_unstemmed Modelling electromagnetic responses of 2-D structures due to spatially non-uniform inducing fields. Analysis of magnetotelluric source effects at coastlines
title_sort modelling electromagnetic responses of 2-d structures due to spatially non-uniform inducing fields. analysis of magnetotelluric source effects at coastlines
url http://hdl.handle.net/20.500.12110/paper_0956540X_v155_n2_p623_Martinelli
work_keys_str_mv AT martinellip modellingelectromagneticresponsesof2dstructuresduetospatiallynonuniforminducingfieldsanalysisofmagnetotelluricsourceeffectsatcoastlines
AT osellaa modellingelectromagneticresponsesof2dstructuresduetospatiallynonuniforminducingfieldsanalysisofmagnetotelluricsourceeffectsatcoastlines
_version_ 1807314783989399552

Ejemplares similares