dc.contributor.advisor | Brataas, Arne | |
dc.contributor.advisor | Mittet, Rune | |
dc.contributor.author | Poudroux, Jean-Michael Yves | |
dc.date.accessioned | 2015-10-06T08:03:28Z | |
dc.date.available | 2015-10-06T08:03:28Z | |
dc.date.created | 2015-06-16 | |
dc.date.issued | 2015 | |
dc.identifier | ntnudaim:13270 | |
dc.identifier.uri | http://hdl.handle.net/11250/2352161 | |
dc.description.abstract | 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. | |
dc.language | eng | |
dc.publisher | NTNU | |
dc.subject | Fysikk og matematikk, Teknisk fysikk | |
dc.title | A Bivariate Analysis of the Homogeneous Plane-Wave Assumption in Magnetotelluric Theory | |
dc.type | Master thesis | |
dc.source.pagenumber | 60 | |