Resumo

ALVAREZ, Orlando et al. Modelos globales de gravedad GOCE y EGM2008: su utilidad y complementariedad en la exploración geofísica. Rev. Asoc. Geol. Argent. [online]. 2016, vol.73, n.1, pp.134-148. ISSN 0004-4822.

The new satellite GOCE mission, whose main objectives are the study of the earth gravity field and the study of the ocean currents circulation, is showing results. Its instruments with greater accuracy designed specifically for this purpose, and also its very low orbit give noticeable advantages over previous missions. This has generated global gravity models with greater accuracy and consistency, than ever before. Moreover, models as EGM2008 that integrate terrestrial with satellite data have the highest spatial resolution achieved so far. The combined use of both models, allows us to obtain information from the lithosphere on a regional scale with the advantage of the high precision of the first and the high-resolution of the second. From the new global gravity models quantities can be derived such as the gravity anomaly and the vertical gravity gradient. The latter is useful to delineate the location of geological structures with great precision, as its signal is more localized to the source than the gravity anomaly. The advantages of using the vertical gravity gradient and the new global gravity models with increasing resolution and precision are enhanced by the development of new methodologies for the correction of the topographic effect. The use of spherical prisms of constant density in order to calculate the topographic effect is necessary for regional studies, as a planar approach induces a considerable error.

Palavras-chave : Satellite gravimetry; Vertical gravity gradient; Topographic effect; Tesseroids; Terrains.

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