Modeling Satellite Gravity Gradient Data to Derive Density, Temperature, and Viscosity Structure of the Antarctic Lithosphere
In this study we combine seismological and petrological models with satellite gravity gradient data to obtain the thermal and compositional structure of the Antarctic lithosphere. Our results indicate that Antarctica is largely in isostatic equilibrium, although notable anomalies exist. A new Antarc...
Published in: | Journal of Geophysical Research: Solid Earth |
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Online Access: | http://resolver.tudelft.nl/uuid:ad1d0acd-f4d0-4a31-88b4-44bf5effcdf5 https://doi.org/10.1029/2019JB017997 |
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fttudelft:oai:tudelft.nl:uuid:ad1d0acd-f4d0-4a31-88b4-44bf5effcdf5 2024-04-28T08:01:55+00:00 Modeling Satellite Gravity Gradient Data to Derive Density, Temperature, and Viscosity Structure of the Antarctic Lithosphere Pappa, F. (author) Ebbing, J. (author) Ferraccioli, F. (author) van der Wal, W. (author) 2019-11-01 http://resolver.tudelft.nl/uuid:ad1d0acd-f4d0-4a31-88b4-44bf5effcdf5 https://doi.org/10.1029/2019JB017997 en eng http://www.scopus.com/inward/record.url?scp=85075478061&partnerID=8YFLogxK JGR Solid Earth--2169-9313--accbaa2d-4cd8-4aa1-8efe-8f6b33ebdf3a http://resolver.tudelft.nl/uuid:ad1d0acd-f4d0-4a31-88b4-44bf5effcdf5 https://doi.org/10.1029/2019JB017997 © 2019 F. Pappa, J. Ebbing, F. Ferraccioli, W. van der Wal Antarctica Glacial Isostatic Adjustment Gravity Gradients Lithosphere Moho journal article 2019 fttudelft https://doi.org/10.1029/2019JB017997 2024-04-09T23:57:24Z In this study we combine seismological and petrological models with satellite gravity gradient data to obtain the thermal and compositional structure of the Antarctic lithosphere. Our results indicate that Antarctica is largely in isostatic equilibrium, although notable anomalies exist. A new Antarctic Moho depth map is derived that fits the satellite gravity gradient anomaly field and is in good agreement with independent seismic estimates. It exhibits detailed crustal thickness variations also in areas of East Antarctica that are poorly explored due to sparse seismic station coverage. The thickness of the lithosphere in our model is in general agreement with seismological estimates, confirming the marked contrast between West Antarctica (<100 km) and East Antarctica (up to 260 km). Finally, we assess the implications of the temperature distribution in our model for mantle viscosities and glacial isostatic adjustment. The upper mantle temperatures we model are lower than obtained from previous seismic velocity studies. This results in higher estimated viscosities underneath West Antarctica. When combined with present-day uplift rates from GPS, a bulk dry upper mantle rheology appears permissible. Astrodynamics & Space Missions Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica West Antarctica Delft University of Technology: Institutional Repository Journal of Geophysical Research: Solid Earth 124 11 12053 12076 |
institution |
Open Polar |
collection |
Delft University of Technology: Institutional Repository |
op_collection_id |
fttudelft |
language |
English |
topic |
Antarctica Glacial Isostatic Adjustment Gravity Gradients Lithosphere Moho |
spellingShingle |
Antarctica Glacial Isostatic Adjustment Gravity Gradients Lithosphere Moho Pappa, F. (author) Ebbing, J. (author) Ferraccioli, F. (author) van der Wal, W. (author) Modeling Satellite Gravity Gradient Data to Derive Density, Temperature, and Viscosity Structure of the Antarctic Lithosphere |
topic_facet |
Antarctica Glacial Isostatic Adjustment Gravity Gradients Lithosphere Moho |
description |
In this study we combine seismological and petrological models with satellite gravity gradient data to obtain the thermal and compositional structure of the Antarctic lithosphere. Our results indicate that Antarctica is largely in isostatic equilibrium, although notable anomalies exist. A new Antarctic Moho depth map is derived that fits the satellite gravity gradient anomaly field and is in good agreement with independent seismic estimates. It exhibits detailed crustal thickness variations also in areas of East Antarctica that are poorly explored due to sparse seismic station coverage. The thickness of the lithosphere in our model is in general agreement with seismological estimates, confirming the marked contrast between West Antarctica (<100 km) and East Antarctica (up to 260 km). Finally, we assess the implications of the temperature distribution in our model for mantle viscosities and glacial isostatic adjustment. The upper mantle temperatures we model are lower than obtained from previous seismic velocity studies. This results in higher estimated viscosities underneath West Antarctica. When combined with present-day uplift rates from GPS, a bulk dry upper mantle rheology appears permissible. Astrodynamics & Space Missions |
format |
Article in Journal/Newspaper |
author |
Pappa, F. (author) Ebbing, J. (author) Ferraccioli, F. (author) van der Wal, W. (author) |
author_facet |
Pappa, F. (author) Ebbing, J. (author) Ferraccioli, F. (author) van der Wal, W. (author) |
author_sort |
Pappa, F. (author) |
title |
Modeling Satellite Gravity Gradient Data to Derive Density, Temperature, and Viscosity Structure of the Antarctic Lithosphere |
title_short |
Modeling Satellite Gravity Gradient Data to Derive Density, Temperature, and Viscosity Structure of the Antarctic Lithosphere |
title_full |
Modeling Satellite Gravity Gradient Data to Derive Density, Temperature, and Viscosity Structure of the Antarctic Lithosphere |
title_fullStr |
Modeling Satellite Gravity Gradient Data to Derive Density, Temperature, and Viscosity Structure of the Antarctic Lithosphere |
title_full_unstemmed |
Modeling Satellite Gravity Gradient Data to Derive Density, Temperature, and Viscosity Structure of the Antarctic Lithosphere |
title_sort |
modeling satellite gravity gradient data to derive density, temperature, and viscosity structure of the antarctic lithosphere |
publishDate |
2019 |
url |
http://resolver.tudelft.nl/uuid:ad1d0acd-f4d0-4a31-88b4-44bf5effcdf5 https://doi.org/10.1029/2019JB017997 |
genre |
Antarc* Antarctic Antarctica East Antarctica West Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica West Antarctica |
op_relation |
http://www.scopus.com/inward/record.url?scp=85075478061&partnerID=8YFLogxK JGR Solid Earth--2169-9313--accbaa2d-4cd8-4aa1-8efe-8f6b33ebdf3a http://resolver.tudelft.nl/uuid:ad1d0acd-f4d0-4a31-88b4-44bf5effcdf5 https://doi.org/10.1029/2019JB017997 |
op_rights |
© 2019 F. Pappa, J. Ebbing, F. Ferraccioli, W. van der Wal |
op_doi |
https://doi.org/10.1029/2019JB017997 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
124 |
container_issue |
11 |
container_start_page |
12053 |
op_container_end_page |
12076 |
_version_ |
1797573456501407744 |