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Solid Earth An interactive open-access journal of the European Geosciences Union

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https://doi.org/10.5194/se-2017-107
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 4.0 License.
Research article
29 Sep 2017
Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).
Crustal Thickness of Antarctica estimated using data from gravimetric satellites
Muriel Llubes1, Lucia Seoane1, Sean Bruinsma2, and Frédérique Rémy3 1Université Paul Sabatier, OMP - GET, UM5563, CNRS/IRD/UPS, 14 Avenue Edouard Belin, 31400 Toulouse, France
2CNES, Department of Terrestrial and Planetary Geodesy, 18 avenue Edouard Belin, 31401 Toulouse Cedex 4 , France
3OMP - LEGOS, UM5566, CNRS/IRD/UPS, 14 Avenue Edouard Belin, 31400 Toulouse, France
Abstract. Computing a better crustal thickness model is still a necessary improvement in Antarctica. In this far continent where almost all the rocky surface is covered by the ice sheet, seismic investigations do not reach a sufficient spatial resolution for geological and geophysical purposes. Here, we computed a global map of Antarctic crustal thicknesses based on space gravity observations. The DIR5 gravity field model, built from GOCE and also GRACE gravimetric data, is inverted with the Parker–Oldenburg's 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 provided by seismological studies, CRUST1.0 and AN1 models. Although CRUST1.0 shows a very good agreement with our model, the spatial resolution is smaller with gravimetric data. Finally, we adjust the crust/mantle density contrast considering the Moho depth from CRUST1.0 model. In East Antarctica, the density contrast clearly shows higher values than in West Antarctica.

Citation: Llubes, M., Seoane, L., Bruinsma, S., and Rémy, F.: Crustal Thickness of Antarctica estimated using data from gravimetric satellites, Solid Earth Discuss., https://doi.org/10.5194/se-2017-107, in review, 2017.
Muriel Llubes et al.
Muriel Llubes et al.
Muriel Llubes et al.

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Short summary
We computed a global map of crustal thickness covering the entire Antarctic continent from GOCE satellite gravimetric data. We compare our result to seismological models: a fairly good agreement is shown. However, better resolution is obtained using the gravity observations than using only seismological ones. This research will help to understand the geology of Antarctica.
We computed a global map of crustal thickness covering the entire Antarctic continent from GOCE...
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