Joint inversion based on variation of information—a crustal model of Wilkes Land, East Antarctica
SUMMARY By combining gravity and magnetic data in a joint inversion approach, 3-D information on the crustal structure of Wilkes Land, East Antarctica, is obtained and possible geological features become evident. Both data sets are combined through a coupling method which decreases the variation of...
Published in: | Geophysical Journal International |
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Oxford University Press (OUP)
2022
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croxfordunivpr:10.1093/gji/ggac334 2024-09-15T17:46:45+00:00 Joint inversion based on variation of information—a crustal model of Wilkes Land, East Antarctica Lösing, Mareen Moorkamp, Max Ebbing, Jörg Deutsche Forschungsgemeinschaft 2022 http://dx.doi.org/10.1093/gji/ggac334 https://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggac334/45505037/ggac334.pdf https://academic.oup.com/gji/article-pdf/232/1/162/45889875/ggac334.pdf en eng Oxford University Press (OUP) https://creativecommons.org/licenses/by/4.0/ Geophysical Journal International volume 232, issue 1, page 162-175 ISSN 0956-540X 1365-246X journal-article 2022 croxfordunivpr https://doi.org/10.1093/gji/ggac334 2024-08-27T04:14:32Z SUMMARY By combining gravity and magnetic data in a joint inversion approach, 3-D information on the crustal structure of Wilkes Land, East Antarctica, is obtained and possible geological features become evident. Both data sets are combined through a coupling method which decreases the variation of information (VI) so data misfit and model dissimilarity are minimized simultaneously. In this manner, statistically compatible inversion results are obtained. The suitability of the method is demonstrated through a synthetic example using magnetic data and pseudo-gravity. Subsequently, we apply the method to gravity residuals and magnetic data and identify matching features of high magnitude density and susceptibility. Prominent structures in NW–SE direction along the edge of the Mawson craton and at the presumed Australo-Antarctic and Indo-Antarctic terrane boundaries are enhanced. Given the structural similarity between inverted susceptibility and density, and a strong indication of a parameter relationship, we suggest a clustering approach in order to differentiate distinct groups with similar parameter properties. The spatial distribution of these clusters reveals possible geological structures that agree with previous 2-D studies and rock measurements from the Indian and Australian continents. This shows that the VI joint inversion is a convenient approach for remote regions like East Antarctica with sparse geological samples. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Wilkes Land Oxford University Press Geophysical Journal International |
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Open Polar |
collection |
Oxford University Press |
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croxfordunivpr |
language |
English |
description |
SUMMARY By combining gravity and magnetic data in a joint inversion approach, 3-D information on the crustal structure of Wilkes Land, East Antarctica, is obtained and possible geological features become evident. Both data sets are combined through a coupling method which decreases the variation of information (VI) so data misfit and model dissimilarity are minimized simultaneously. In this manner, statistically compatible inversion results are obtained. The suitability of the method is demonstrated through a synthetic example using magnetic data and pseudo-gravity. Subsequently, we apply the method to gravity residuals and magnetic data and identify matching features of high magnitude density and susceptibility. Prominent structures in NW–SE direction along the edge of the Mawson craton and at the presumed Australo-Antarctic and Indo-Antarctic terrane boundaries are enhanced. Given the structural similarity between inverted susceptibility and density, and a strong indication of a parameter relationship, we suggest a clustering approach in order to differentiate distinct groups with similar parameter properties. The spatial distribution of these clusters reveals possible geological structures that agree with previous 2-D studies and rock measurements from the Indian and Australian continents. This shows that the VI joint inversion is a convenient approach for remote regions like East Antarctica with sparse geological samples. |
author2 |
Deutsche Forschungsgemeinschaft |
format |
Article in Journal/Newspaper |
author |
Lösing, Mareen Moorkamp, Max Ebbing, Jörg |
spellingShingle |
Lösing, Mareen Moorkamp, Max Ebbing, Jörg Joint inversion based on variation of information—a crustal model of Wilkes Land, East Antarctica |
author_facet |
Lösing, Mareen Moorkamp, Max Ebbing, Jörg |
author_sort |
Lösing, Mareen |
title |
Joint inversion based on variation of information—a crustal model of Wilkes Land, East Antarctica |
title_short |
Joint inversion based on variation of information—a crustal model of Wilkes Land, East Antarctica |
title_full |
Joint inversion based on variation of information—a crustal model of Wilkes Land, East Antarctica |
title_fullStr |
Joint inversion based on variation of information—a crustal model of Wilkes Land, East Antarctica |
title_full_unstemmed |
Joint inversion based on variation of information—a crustal model of Wilkes Land, East Antarctica |
title_sort |
joint inversion based on variation of information—a crustal model of wilkes land, east antarctica |
publisher |
Oxford University Press (OUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1093/gji/ggac334 https://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggac334/45505037/ggac334.pdf https://academic.oup.com/gji/article-pdf/232/1/162/45889875/ggac334.pdf |
genre |
Antarc* Antarctic Antarctica East Antarctica Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Wilkes Land |
op_source |
Geophysical Journal International volume 232, issue 1, page 162-175 ISSN 0956-540X 1365-246X |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1093/gji/ggac334 |
container_title |
Geophysical Journal International |
_version_ |
1810495120589455360 |