The exploitation of state of the art digital terrain databases and combined or satellite-only Earth gravity models for the estimation of the crust–mantle interface over oceanic regions
| Autor: | Dimitrios Tsoulis, Dimitrios Arabelos |
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| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | Geophysical Journal International |
| ISSN: | 1365-246X 0956-540X |
| Popis: | SUMMARY Thepredictionofthegeometryofcharacteristiccrustalinterfaces,suchasbathymetryorMoho, can be carried out efficiently by applying well tested estimation procedures. The computation of the gravity response at the Earth’s surface of a characteristic density layer in the Earth’s interior in combination with the statistical tool of Least Squares Collocation have been proven to be a flexible and useful prediction tool, especially at regions with lack in primary crustal observations.Toinvestigatethecontributionofrecentlyreleaseddigitalterraindatabasestothis estimation procedure we use the one-minute global elevation databases GEBCO and TOPO14. Using the combined Earth gravity model EGM2008 and recently released GOCE-only models we produce the observed grid of gravity anomalies over two test areas in the Indian and the Atlantic oceans. The estimation procedure is based on a two-layer model of the upper crust and is driven mainly by the definition and quality of the involved covariance functions. The application leads to independent and much denser estimations of the crust–mantle interface over these regions, in comparison with the available Moho information provided by global databasessuchasCRUST2.0.Apartfromthedirectcomparisonbetweentheobtainedsolutions a further assessment was carried out in terms of computing the corresponding isostatic effects on the available regional altimeter data. |
| Databáze: | OpenAIRE |
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