Geoelectrical modeling of shallow structures using parallel and perpendicular arrays

In this article we analyze the sensitivity of a geoelectrical modeling technique to image 2D shallow structures. Firstly, we extend a previously developed 2D method based on Rayleigh-Fourier expansions, in order to allow arbitrary locations for the electrodes and also 3D earth models. This method is...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Bonomo, N., Osella, A., Martinelli, P.
Formato:	JOUR
Materias:	buried structure electromagnetic survey
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_13438832_v54_n5_p523_Bonomo
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_13438832_v54_n5_p523_Bonomo
record_format	dspace
spelling	todo:paper_13438832_v54_n5_p523_Bonomo2023-10-03T16:09:47Z Geoelectrical modeling of shallow structures using parallel and perpendicular arrays Bonomo, N. Osella, A. Martinelli, P. buried structure electromagnetic survey In this article we analyze the sensitivity of a geoelectrical modeling technique to image 2D shallow structures. Firstly, we extend a previously developed 2D method based on Rayleigh-Fourier expansions, in order to allow arbitrary locations for the electrodes and also 3D earth models. This method is an alternative to finite element and finite difference techniques and is especially suitable to model multilayered structures, with smooth irregular boundaries. Then, for simple 2D models we build up two synthetic pseudosections, one for electrode deployments parallel to a profile perpendicular to the strike, and other for deployments perpendicular to it. We analyze the advantages in using both pseudosections to model these structures. We also compare geoelectric results with the corresponding audiomagnetotelluric transverse electric and transverse magnetic responses. Finally, we perform a geoelectrical survey to image a shallow buried structure and show the goodness of the model fit obtained considering both pseudosections. For the examples studied here, we conclude that considering both pseudosections leads to a more accurate description of the structures. When a 2D anomaly is present, its effect on the perpendicular component is more focused, both in width and depth, than in the parallel component. Hence the perpendicular component helps to constrain the localization of the inhomogeneity. In addition, we find similarities between the geoelectric parallel and perpendicular responses and the corresponding audiomagnetotelluric transverse magnetic and transverse electric results, respectively. When inverting audiomagnetotelluric data using 2D codes, better resolution in the electrical imaging is obtained when both modes are considered; then it is expected that 2D imaging of geoelectric data including both arrays should lead to an optimization of the inversion process. Even more, if results of these inversions could be used in correlation with AMT results, it is clear that this kind of joint inversion should contribute to remove uncertainties allowing an improvement in the description of the actual structures. Copyright © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. Fil:Bonomo, N. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 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_13438832_v54_n5_p523_Bonomo
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	buried structure electromagnetic survey
spellingShingle	buried structure electromagnetic survey Bonomo, N. Osella, A. Martinelli, P. Geoelectrical modeling of shallow structures using parallel and perpendicular arrays
topic_facet	buried structure electromagnetic survey
description	In this article we analyze the sensitivity of a geoelectrical modeling technique to image 2D shallow structures. Firstly, we extend a previously developed 2D method based on Rayleigh-Fourier expansions, in order to allow arbitrary locations for the electrodes and also 3D earth models. This method is an alternative to finite element and finite difference techniques and is especially suitable to model multilayered structures, with smooth irregular boundaries. Then, for simple 2D models we build up two synthetic pseudosections, one for electrode deployments parallel to a profile perpendicular to the strike, and other for deployments perpendicular to it. We analyze the advantages in using both pseudosections to model these structures. We also compare geoelectric results with the corresponding audiomagnetotelluric transverse electric and transverse magnetic responses. Finally, we perform a geoelectrical survey to image a shallow buried structure and show the goodness of the model fit obtained considering both pseudosections. For the examples studied here, we conclude that considering both pseudosections leads to a more accurate description of the structures. When a 2D anomaly is present, its effect on the perpendicular component is more focused, both in width and depth, than in the parallel component. Hence the perpendicular component helps to constrain the localization of the inhomogeneity. In addition, we find similarities between the geoelectric parallel and perpendicular responses and the corresponding audiomagnetotelluric transverse magnetic and transverse electric results, respectively. When inverting audiomagnetotelluric data using 2D codes, better resolution in the electrical imaging is obtained when both modes are considered; then it is expected that 2D imaging of geoelectric data including both arrays should lead to an optimization of the inversion process. Even more, if results of these inversions could be used in correlation with AMT results, it is clear that this kind of joint inversion should contribute to remove uncertainties allowing an improvement in the description of the actual structures. Copyright © The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences.
format	JOUR
author	Bonomo, N. Osella, A. Martinelli, P.
author_facet	Bonomo, N. Osella, A. Martinelli, P.
author_sort	Bonomo, N.
title	Geoelectrical modeling of shallow structures using parallel and perpendicular arrays
title_short	Geoelectrical modeling of shallow structures using parallel and perpendicular arrays
title_full	Geoelectrical modeling of shallow structures using parallel and perpendicular arrays
title_fullStr	Geoelectrical modeling of shallow structures using parallel and perpendicular arrays
title_full_unstemmed	Geoelectrical modeling of shallow structures using parallel and perpendicular arrays
title_sort	geoelectrical modeling of shallow structures using parallel and perpendicular arrays
url	http://hdl.handle.net/20.500.12110/paper_13438832_v54_n5_p523_Bonomo
work_keys_str_mv	AT bonomon geoelectricalmodelingofshallowstructuresusingparallelandperpendiculararrays AT osellaa geoelectricalmodelingofshallowstructuresusingparallelandperpendiculararrays AT martinellip geoelectricalmodelingofshallowstructuresusingparallelandperpendiculararrays
_version_	1807322178713026560

Geoelectrical modeling of shallow structures using parallel and perpendicular arrays

Ejemplares similares