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 pres...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-04-01
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| Series: | Solid Earth |
| Online Access: | https://www.solid-earth.net/9/457/2018/se-9-457-2018.pdf |
| _version_ | 1828446313370353664 |
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| author | M. Llubes L. Seoane S. Bruinsma F. Rémy |
| author_facet | M. Llubes L. Seoane S. Bruinsma F. Rémy |
| author_sort | M. Llubes |
| collection | DOAJ |
| 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. |
| first_indexed | 2024-12-10T22:10:28Z |
| format | Article |
| id | doaj.art-293c65615b7446a78891e285f3eb0013 |
| institution | Directory Open Access Journal |
| issn | 1869-9510 1869-9529 |
| language | English |
| last_indexed | 2024-12-10T22:10:28Z |
| publishDate | 2018-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Solid Earth |
| spelling | doaj.art-293c65615b7446a78891e285f3eb00132022-12-22T01:31:37ZengCopernicus PublicationsSolid Earth1869-95101869-95292018-04-01945746710.5194/se-9-457-2018Crustal thickness of Antarctica estimated using data from gravimetric satellitesM. Llubes0L. Seoane1S. Bruinsma2F. Rémy3Université Paul Sabatier, OMP-GET, UM5563, CNRS/IRD/UPS, 14 Avenue Edouard Belin, 31400 Toulouse, FranceUniversité Paul Sabatier, OMP-GET, UM5563, CNRS/IRD/UPS, 14 Avenue Edouard Belin, 31400 Toulouse, FranceCNES, Department of Terrestrial and Planetary Geodesy, 18 Avenue Edouard Belin, 31401 Toulouse CEDEX 4, FranceOMP-LEGOS, UM5566, CNRS/IRD/UPS, 14 Avenue Edouard Belin, 31400 Toulouse, FranceComputing 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.https://www.solid-earth.net/9/457/2018/se-9-457-2018.pdf |
| spellingShingle | M. Llubes L. Seoane S. Bruinsma F. Rémy Crustal thickness of Antarctica estimated using data from gravimetric satellites Solid Earth |
| title | 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_short | Crustal thickness of Antarctica estimated using data from gravimetric satellites |
| title_sort | crustal thickness of antarctica estimated using data from gravimetric satellites |
| url | https://www.solid-earth.net/9/457/2018/se-9-457-2018.pdf |
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