Universität zu Köln

Rochlitz, Raphael, Seidel, Marc ORCID: 0000-0002-6579-6463 and Boerner, Ralph-Uwe (2021). Evaluation of three approaches for simulating 3-D time-domain electromagnetic data. Geophys. J. Int., 227 (3). S. 1980 - 1996. OXFORD: OXFORD UNIV PRESS. ISSN 1365-246X

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Abstract

We implemented and compared the implicit Euler time-stepping approach, the inverse Fourier transform-based approach and the Rational Arnoldi method for simulating 3-D transient electromagnetic data. We utilize the finite-element method with unstructured tetrahedral meshes for the spatial discretization supporting irregular survey geometries and anisotropic material parameters. Both, switch-on and switch-off current waveforms, can be used in combination with direct current solutions of Poisson problems as initial conditions. Moreover, we address important topics such as the incorporation of source currents and opportunities to simulate impulse as well as step response magnetic field data with all approaches for supporting a great variety of applications. Three examples ranging from simple to complex real-world geometries and validations against external codes provide insight into the numerical accuracy, computational performance and unique characteristics of the three applied methods. We further present an application of logarithmic Fourier transforms to convert transient data into the frequency domain. We made all approaches available in the open-source Python toolbox custEM, which previously supported only frequency-domain electromagnetic data. The object-oriented software implementation is suited for further elaboration on distinct modelling topics and the presented examples can serve for benchmarking other codes.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Rochlitz, Raphael UNSPECIFIED UNSPECIFIED UNSPECIFIED Seidel, Marc UNSPECIFIED orcid.org/0000-0002-6579-6463 UNSPECIFIED Boerner, Ralph-Uwe UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-587691
DOI:	10.1093/gji/ggab302
Journal or Publication Title:	Geophys. J. Int.
Volume:	227
Number:	3
Page Range:	S. 1980 - 1996
Date:	2021
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-246X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FINITE-ELEMENT SIMULATION; MAGNETOTELLURIC DATA; INDUCED POLARIZATION; REALISTIC MODEL; MARLIM R3D; HANKEL; DIFFUSION; FREQUENCY; DIFFERENCE; FIELDS Multiple languages Geochemistry & Geophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58769