Determinación de la estructura cortical y litosférica mediante inversión de la elevación y la ondulación del geoide en la transición Atlántico-Mediterraneo

• J. Fullea ^[2] ; M. Fernàndez ^[2] ; H. Zeyen ^[1] ; C. Ayala ^[2]
  1. [1] University of Paris-Sud

     University of Paris-Sud

     Arrondissement de Palaiseau, Francia

     
  2. [2] Instituto de Ciencias de la Tierra Jaume Aimera (CSIC)
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 6, 3, 2004 (Ejemplar dedicado a: IV Congreso Geológico de España (Zaragoza, 12-15 julio, 2004)), págs. 237-240
• Idioma: español
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• Resumen

  • The geo id anomaly is related with the density structure within the Earth. The long wavelength features are associated with deep mass anomalies (core/mantle), while the very short ones correspond to uncompensated topography and lithospheric flexure. In the middle term wavelengths the geoid depends upon the mass anomalies within the lithosphere and is proportional to the first moment of the density anomaly benath the observation point. An inversion method which takes into account the elevation and geoid fields as well as local isostasy is proposed in order to resolve, at a first order, the crustal and lithospheric structure beneath the Atlantic-Mediterranean transition. The obtained results show a zone of thickened lithosphere, oriented NE-SW and located beneath the western Betics, Rif, Gibraltar Strait, the G ulf of Cadiz and the Atlantic Moroccan margin. In addition, a zone o f thinned lithosphere with the same orientation is interpreted beneath the eastern Almería coast and the Alboran Sea. More detailed models can be obtained combining this first order structure with other available geophysical observables.