Crustal thickness of Antarctica estimated using data from gravimetric satellites
Computing a better crustal thickness model is still a necessary improvement in Antarctica. In this remote continent where almost all the bedrock is covered by the ice sheet, seismic investigations do not reach a sufficient spatial resolution for geological and geophysical purposes. Here, we present...
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2018
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00006778 2023-05-15T13:34:49+02:00 Crustal thickness of Antarctica estimated using data from gravimetric satellites Llubes, Muriel Seoane, Lucia Bruinsma, Sean Rémy, Frédérique 2018-04 electronic https://doi.org/10.5194/se-9-457-2018 https://noa.gwlb.de/receive/cop_mods_00006778 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00006735/se-9-457-2018.pdf https://se.copernicus.org/articles/9/457/2018/se-9-457-2018.pdf eng eng Copernicus Publications Solid Earth -- 1869-9529 https://doi.org/10.5194/se-9-457-2018 https://noa.gwlb.de/receive/cop_mods_00006778 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00006735/se-9-457-2018.pdf https://se.copernicus.org/articles/9/457/2018/se-9-457-2018.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/se-9-457-2018 2022-02-08T22:58:52Z Computing a better crustal thickness model is still a necessary improvement in Antarctica. In this remote continent where almost all the bedrock is covered by the ice sheet, seismic investigations do not reach a sufficient spatial resolution for geological and geophysical purposes. Here, we present a global map of Antarctic crustal thickness computed from space gravity observations. The DIR5 gravity field model, built from GOCE and GRACE gravimetric data, is inverted with the Parker–Oldenburg iterative algorithm. The BEDMAP products are used to estimate the gravity effect of the ice and the rocky surface. Our result is compared to crustal thickness calculated from seismological studies and the CRUST1.0 and AN1 models. Although the CRUST1.0 model shows a very good agreement with ours, its spatial resolution is larger than the one we obtain with gravimetric data. Finally, we compute a model in which the crust–mantle density contrast is adjusted to fit the Moho depth from the CRUST1.0 model. In East Antarctica, the resulting density contrast clearly shows higher values than in West Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Ice Sheet West Antarctica Niedersächsisches Online-Archiv NOA Antarctic East Antarctica Oldenburg West Antarctica Solid Earth 9 2 457 467 |
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article Verlagsveröffentlichung Llubes, Muriel Seoane, Lucia Bruinsma, Sean Rémy, Frédérique Crustal thickness of Antarctica estimated using data from gravimetric satellites |
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article Verlagsveröffentlichung |
description |
Computing a better crustal thickness model is still a necessary improvement in Antarctica. In this remote continent where almost all the bedrock is covered by the ice sheet, seismic investigations do not reach a sufficient spatial resolution for geological and geophysical purposes. Here, we present a global map of Antarctic crustal thickness computed from space gravity observations. The DIR5 gravity field model, built from GOCE and GRACE gravimetric data, is inverted with the Parker–Oldenburg iterative algorithm. The BEDMAP products are used to estimate the gravity effect of the ice and the rocky surface. Our result is compared to crustal thickness calculated from seismological studies and the CRUST1.0 and AN1 models. Although the CRUST1.0 model shows a very good agreement with ours, its spatial resolution is larger than the one we obtain with gravimetric data. Finally, we compute a model in which the crust–mantle density contrast is adjusted to fit the Moho depth from the CRUST1.0 model. In East Antarctica, the resulting density contrast clearly shows higher values than in West Antarctica. |
format |
Article in Journal/Newspaper |
author |
Llubes, Muriel Seoane, Lucia Bruinsma, Sean Rémy, Frédérique |
author_facet |
Llubes, Muriel Seoane, Lucia Bruinsma, Sean Rémy, Frédérique |
author_sort |
Llubes, Muriel |
title |
Crustal thickness of Antarctica estimated using data from gravimetric satellites |
title_short |
Crustal thickness of Antarctica estimated using data from gravimetric satellites |
title_full |
Crustal thickness of Antarctica estimated using data from gravimetric satellites |
title_fullStr |
Crustal thickness of Antarctica estimated using data from gravimetric satellites |
title_full_unstemmed |
Crustal thickness of Antarctica estimated using data from gravimetric satellites |
title_sort |
crustal thickness of antarctica estimated using data from gravimetric satellites |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/se-9-457-2018 https://noa.gwlb.de/receive/cop_mods_00006778 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00006735/se-9-457-2018.pdf https://se.copernicus.org/articles/9/457/2018/se-9-457-2018.pdf |
geographic |
Antarctic East Antarctica Oldenburg West Antarctica |
geographic_facet |
Antarctic East Antarctica Oldenburg West Antarctica |
genre |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Ice Sheet West Antarctica |
op_relation |
Solid Earth -- 1869-9529 https://doi.org/10.5194/se-9-457-2018 https://noa.gwlb.de/receive/cop_mods_00006778 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00006735/se-9-457-2018.pdf https://se.copernicus.org/articles/9/457/2018/se-9-457-2018.pdf |
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https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/se-9-457-2018 |
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