Forward modeling of magnetotellurics using Comsol Multiphysics

Magnetotellurics is an electromagnetic geophysical method that has been widely used to study structures in Earth's subsurface. Numerical modeling of magnetotellurics is important for survey design, inversion, geological interpretation and many other aspects of geophysical studies. For example,...

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Autores principales:	A. Li, S.L. Butler
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Magnetotellurics Comsol multiphysics Complex crater Geomagnetically induced curent Tipper Geography. Anthropology. Recreation G Geology QE1-996.5 Electronic computers. Computer science QA75.5-76.95
Acceso en línea:	https://doaj.org/article/17ef761f86a74c249f30959d5361bcda
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spelling	oai:doaj.org-article:17ef761f86a74c249f30959d5361bcda2021-11-14T04:35:27ZForward modeling of magnetotellurics using Comsol Multiphysics2590-197410.1016/j.acags.2021.100073https://doaj.org/article/17ef761f86a74c249f30959d5361bcda2021-12-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2590197421000215https://doaj.org/toc/2590-1974Magnetotellurics is an electromagnetic geophysical method that has been widely used to study structures in Earth's subsurface. Numerical modeling of magnetotellurics is important for survey design, inversion, geological interpretation and many other aspects of geophysical studies. For example, modeling a subsurface conductive body in terms of its conductivity, geometry and dipping angle would yield substantial information on the phase response and sensitivity in an MT survey. While there are many different modeling techniques, the finite element method is most commonly used. In this effort, we present magnetotelluric models of layered Earth, uplift structures, auroral electrojets, and geomagnetically induced currents in power-line skywires using the commercial finite-element package Comsol Multiphysics. The AC/DC module in Comsol can be used to solve Maxwell's equations in the quasi-static limit for modeling the magnetotelluric response. One of the advantages of Comsol modeling is its Graphical User Interface (GUI), which allows users to solve complex single or multi-physics problems in a meshed domain. The use of Comsol also reduces the need for sophisticated computer coding when solving partial differential equations such as Maxwell's equations. In the effort presented here, we first discuss model validation for layered Earth geometries. We then present two examples of magnetotellurics modeling in impact crater and geomagnetically induced current studies. Numerical results were compared with analytical solutions or benchmark results whenever possible.A. LiS.L. ButlerElsevierarticleMagnetotelluricsComsol multiphysicsComplex craterGeomagnetically induced curentTipperGeography. Anthropology. RecreationGGeologyQE1-996.5Electronic computers. Computer scienceQA75.5-76.95ENApplied Computing and Geosciences, Vol 12, Iss , Pp 100073- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Magnetotellurics Comsol multiphysics Complex crater Geomagnetically induced curent Tipper Geography. Anthropology. Recreation G Geology QE1-996.5 Electronic computers. Computer science QA75.5-76.95
spellingShingle	Magnetotellurics Comsol multiphysics Complex crater Geomagnetically induced curent Tipper Geography. Anthropology. Recreation G Geology QE1-996.5 Electronic computers. Computer science QA75.5-76.95 A. Li S.L. Butler Forward modeling of magnetotellurics using Comsol Multiphysics
description	Magnetotellurics is an electromagnetic geophysical method that has been widely used to study structures in Earth's subsurface. Numerical modeling of magnetotellurics is important for survey design, inversion, geological interpretation and many other aspects of geophysical studies. For example, modeling a subsurface conductive body in terms of its conductivity, geometry and dipping angle would yield substantial information on the phase response and sensitivity in an MT survey. While there are many different modeling techniques, the finite element method is most commonly used. In this effort, we present magnetotelluric models of layered Earth, uplift structures, auroral electrojets, and geomagnetically induced currents in power-line skywires using the commercial finite-element package Comsol Multiphysics. The AC/DC module in Comsol can be used to solve Maxwell's equations in the quasi-static limit for modeling the magnetotelluric response. One of the advantages of Comsol modeling is its Graphical User Interface (GUI), which allows users to solve complex single or multi-physics problems in a meshed domain. The use of Comsol also reduces the need for sophisticated computer coding when solving partial differential equations such as Maxwell's equations. In the effort presented here, we first discuss model validation for layered Earth geometries. We then present two examples of magnetotellurics modeling in impact crater and geomagnetically induced current studies. Numerical results were compared with analytical solutions or benchmark results whenever possible.
format	article
author	A. Li S.L. Butler
author_facet	A. Li S.L. Butler
author_sort	A. Li
title	Forward modeling of magnetotellurics using Comsol Multiphysics
title_short	Forward modeling of magnetotellurics using Comsol Multiphysics
title_full	Forward modeling of magnetotellurics using Comsol Multiphysics
title_fullStr	Forward modeling of magnetotellurics using Comsol Multiphysics
title_full_unstemmed	Forward modeling of magnetotellurics using Comsol Multiphysics
title_sort	forward modeling of magnetotellurics using comsol multiphysics
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/17ef761f86a74c249f30959d5361bcda
work_keys_str_mv	AT ali forwardmodelingofmagnetotelluricsusingcomsolmultiphysics AT slbutler forwardmodelingofmagnetotelluricsusingcomsolmultiphysics
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Forward modeling of magnetotellurics using Comsol Multiphysics

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