Universität zu Köln

Wittke, J. and Tezkan, B. (2014). Meshfree magnetotelluric modelling. Geophys. J. Int., 198 (2). S. 1255 - 1269. OXFORD: OXFORD UNIV PRESS. ISSN 1365-246X

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Abstract

We present a new approach for 2-D magnetotelluric forward numerical modelling in contrast to traditional numerical methods like finite elements or finite differences. The method used for solving the partial differential equations is based on a mesh-free technique which does not need an underlaying mesh or grid. We use the Meshless Local Petrov-Galerkin (MLPG) method in combination with radial basis functions to simulate the response of a given conductivity model to a plane-wave source. We compare the mesh-free solution with known simulation programs and simple analytical solutions. Furthermore, we discuss the new magnetotelluric modelling method in terms of implementation and stability. First, we study the convergence and discretization errors of the new method with a simple half-space conductivity model. Then we compare our mesh-free simulation results with simple 2-D conductivity models with the results of a well-known finite element program. In the end, we provide a smooth conductivity model calculated with the mesh-free approach. The modelling results, even with randomly distributed nodes, are in a good agreement with those obtained by the finite element method.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wittke, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tezkan, B. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-432859
DOI:	10.1093/gji/ggu207
Journal or Publication Title:	Geophys. J. Int.
Volume:	198
Number:	2
Page Range:	S. 1255 - 1269
Date:	2014
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1365-246X
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RADIAL BASIS FUNCTIONS; PETROV-GALERKIN MLPG; NODAL INTEGRATION Multiple languages Geochemistry & Geophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/43285