Antarctica 3-D crustal structure investigation by means of the Bayesian gravity inversion: the Wilkes Land case study
SUMMARY In this study, a Bayesian gravity inversion algorithm is applied to infer a complete 3-D density model of the crust in the region of the Wilkes Land. One of the main objective of this work is to provide information on the thickening/thinning of the crust beneath the basin or the amount and c...
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Oxford University Press (OUP)
2022
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croxfordunivpr:10.1093/gji/ggac036 2024-09-15T17:46:50+00:00 Antarctica 3-D crustal structure investigation by means of the Bayesian gravity inversion: the Wilkes Land case study Capponi, M Sampietro, D Ebbing, J Ferraccioli, F 2022 http://dx.doi.org/10.1093/gji/ggac036 https://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggac036/42352253/ggac036.pdf https://academic.oup.com/gji/article-pdf/229/3/2147/42982035/ggac036.pdf en eng Oxford University Press (OUP) https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model Geophysical Journal International volume 229, issue 3, page 2147-2161 ISSN 0956-540X 1365-246X journal-article 2022 croxfordunivpr https://doi.org/10.1093/gji/ggac036 2024-08-12T04:23:22Z SUMMARY In this study, a Bayesian gravity inversion algorithm is applied to infer a complete 3-D density model of the crust in the region of the Wilkes Land. One of the main objective of this work is to provide information on the thickening/thinning of the crust beneath the basin or the amount and characteristics of sediment deposits in the area. After collecting all the latest available geophysical data and models of the study region, neglecting gravity derived information, a first 3-D model was defined in terms of principal geological horizons and density distribution together with an estimate of its accuracy. Then, two gravity observations, namely gravity disturbances and second radial derivative of the anomalous potential, were jointly inverted in order to adjust the a-priori 3-D model and obtain the so-called a posterior improved model, now coherent with gravity. The present work summarizes the principal results obtained within the inversion performed in the Wilkes Land region together with a sensitivity analysis to assess the reliability of the inverted 3-D model. The results show a crustal thickness below the Wilkes Land higher than 25 km, characterized by higher densities, sedimentary basins that reach in some zones thicknesses of about 7 km and geometries below the Trans-Antarctic Mountains that suggest a large root of the mountains and lighter mantle densities. Article in Journal/Newspaper Antarc* Antarctic Antarctica Wilkes Land Oxford University Press Geophysical Journal International 229 3 2147 2161 |
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Open Polar |
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Oxford University Press |
op_collection_id |
croxfordunivpr |
language |
English |
description |
SUMMARY In this study, a Bayesian gravity inversion algorithm is applied to infer a complete 3-D density model of the crust in the region of the Wilkes Land. One of the main objective of this work is to provide information on the thickening/thinning of the crust beneath the basin or the amount and characteristics of sediment deposits in the area. After collecting all the latest available geophysical data and models of the study region, neglecting gravity derived information, a first 3-D model was defined in terms of principal geological horizons and density distribution together with an estimate of its accuracy. Then, two gravity observations, namely gravity disturbances and second radial derivative of the anomalous potential, were jointly inverted in order to adjust the a-priori 3-D model and obtain the so-called a posterior improved model, now coherent with gravity. The present work summarizes the principal results obtained within the inversion performed in the Wilkes Land region together with a sensitivity analysis to assess the reliability of the inverted 3-D model. The results show a crustal thickness below the Wilkes Land higher than 25 km, characterized by higher densities, sedimentary basins that reach in some zones thicknesses of about 7 km and geometries below the Trans-Antarctic Mountains that suggest a large root of the mountains and lighter mantle densities. |
format |
Article in Journal/Newspaper |
author |
Capponi, M Sampietro, D Ebbing, J Ferraccioli, F |
spellingShingle |
Capponi, M Sampietro, D Ebbing, J Ferraccioli, F Antarctica 3-D crustal structure investigation by means of the Bayesian gravity inversion: the Wilkes Land case study |
author_facet |
Capponi, M Sampietro, D Ebbing, J Ferraccioli, F |
author_sort |
Capponi, M |
title |
Antarctica 3-D crustal structure investigation by means of the Bayesian gravity inversion: the Wilkes Land case study |
title_short |
Antarctica 3-D crustal structure investigation by means of the Bayesian gravity inversion: the Wilkes Land case study |
title_full |
Antarctica 3-D crustal structure investigation by means of the Bayesian gravity inversion: the Wilkes Land case study |
title_fullStr |
Antarctica 3-D crustal structure investigation by means of the Bayesian gravity inversion: the Wilkes Land case study |
title_full_unstemmed |
Antarctica 3-D crustal structure investigation by means of the Bayesian gravity inversion: the Wilkes Land case study |
title_sort |
antarctica 3-d crustal structure investigation by means of the bayesian gravity inversion: the wilkes land case study |
publisher |
Oxford University Press (OUP) |
publishDate |
2022 |
url |
http://dx.doi.org/10.1093/gji/ggac036 https://academic.oup.com/gji/advance-article-pdf/doi/10.1093/gji/ggac036/42352253/ggac036.pdf https://academic.oup.com/gji/article-pdf/229/3/2147/42982035/ggac036.pdf |
genre |
Antarc* Antarctic Antarctica Wilkes Land |
genre_facet |
Antarc* Antarctic Antarctica Wilkes Land |
op_source |
Geophysical Journal International volume 229, issue 3, page 2147-2161 ISSN 0956-540X 1365-246X |
op_rights |
https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model |
op_doi |
https://doi.org/10.1093/gji/ggac036 |
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Geophysical Journal International |
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229 |
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3 |
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2147 |
op_container_end_page |
2161 |
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1810495233964638208 |