A Bivariate Analysis of the Homogeneous Plane-Wave Assumption in Magnetotelluric Theory
The magnetotelluric method is an electromagnetic induction method used to image subsurface resistivity. It utilizes Earths' natural time-varying electromagnetic field as a source. The fields propagating into the subsurface are assumed to consist of homogeneous plane-waves. In a marine setting,...
Main Author: | |
---|---|
Other Authors: | , |
Format: | Master Thesis |
Language: | English |
Published: |
NTNU
2015
|
Subjects: | |
Online Access: | http://hdl.handle.net/11250/2352161 |
id |
ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2352161 |
---|---|
record_format |
openpolar |
spelling |
ftntnutrondheimi:oai:ntnuopen.ntnu.no:11250/2352161 2023-05-15T15:38:56+02:00 A Bivariate Analysis of the Homogeneous Plane-Wave Assumption in Magnetotelluric Theory Poudroux, Jean-Michael Yves Brataas, Arne Mittet, Rune 2015 http://hdl.handle.net/11250/2352161 eng eng NTNU ntnudaim:13270 http://hdl.handle.net/11250/2352161 60 Fysikk og matematikk Teknisk fysikk Master thesis 2015 ftntnutrondheimi 2019-09-17T06:51:05Z The magnetotelluric method is an electromagnetic induction method used to image subsurface resistivity. It utilizes Earths' natural time-varying electromagnetic field as a source. The fields propagating into the subsurface are assumed to consist of homogeneous plane-waves. In a marine setting, the subsurface response is measured by a grid of receivers placed at the seabed. The homogeneous plane-wave assumption is a widespread and central argument for how traditional processing schemes are formulated and solved. In this thesis we provide a closer look on this assumption, by approximating the direct source field using up-down decomposition above the seabed. By organizing the data into receiver-pairs, we evaluate the homogeneous plane-wave assumption as a function of receiver-spacing. The method was applied on two offshore case studies located in the North Sea and Barents Sea. The results showed that the homogeneous plane-wave assumption was dependent on the receiver-spacings. The approximation was better for nearest neighbors, but decreased for receivers that were far apart. Master Thesis Barents Sea NTNU Open Archive (Norwegian University of Science and Technology) Barents Sea |
institution |
Open Polar |
collection |
NTNU Open Archive (Norwegian University of Science and Technology) |
op_collection_id |
ftntnutrondheimi |
language |
English |
topic |
Fysikk og matematikk Teknisk fysikk |
spellingShingle |
Fysikk og matematikk Teknisk fysikk Poudroux, Jean-Michael Yves A Bivariate Analysis of the Homogeneous Plane-Wave Assumption in Magnetotelluric Theory |
topic_facet |
Fysikk og matematikk Teknisk fysikk |
description |
The magnetotelluric method is an electromagnetic induction method used to image subsurface resistivity. It utilizes Earths' natural time-varying electromagnetic field as a source. The fields propagating into the subsurface are assumed to consist of homogeneous plane-waves. In a marine setting, the subsurface response is measured by a grid of receivers placed at the seabed. The homogeneous plane-wave assumption is a widespread and central argument for how traditional processing schemes are formulated and solved. In this thesis we provide a closer look on this assumption, by approximating the direct source field using up-down decomposition above the seabed. By organizing the data into receiver-pairs, we evaluate the homogeneous plane-wave assumption as a function of receiver-spacing. The method was applied on two offshore case studies located in the North Sea and Barents Sea. The results showed that the homogeneous plane-wave assumption was dependent on the receiver-spacings. The approximation was better for nearest neighbors, but decreased for receivers that were far apart. |
author2 |
Brataas, Arne Mittet, Rune |
format |
Master Thesis |
author |
Poudroux, Jean-Michael Yves |
author_facet |
Poudroux, Jean-Michael Yves |
author_sort |
Poudroux, Jean-Michael Yves |
title |
A Bivariate Analysis of the Homogeneous Plane-Wave Assumption in Magnetotelluric Theory |
title_short |
A Bivariate Analysis of the Homogeneous Plane-Wave Assumption in Magnetotelluric Theory |
title_full |
A Bivariate Analysis of the Homogeneous Plane-Wave Assumption in Magnetotelluric Theory |
title_fullStr |
A Bivariate Analysis of the Homogeneous Plane-Wave Assumption in Magnetotelluric Theory |
title_full_unstemmed |
A Bivariate Analysis of the Homogeneous Plane-Wave Assumption in Magnetotelluric Theory |
title_sort |
bivariate analysis of the homogeneous plane-wave assumption in magnetotelluric theory |
publisher |
NTNU |
publishDate |
2015 |
url |
http://hdl.handle.net/11250/2352161 |
geographic |
Barents Sea |
geographic_facet |
Barents Sea |
genre |
Barents Sea |
genre_facet |
Barents Sea |
op_source |
60 |
op_relation |
ntnudaim:13270 http://hdl.handle.net/11250/2352161 |
_version_ |
1766370350371700736 |