Abstract
A new composite map of magnetic surface (MAGSURF) anomaly for Italy and its adjacent region has been derived from sea and ground surveys on the basis of an improved definition of the Italian Magnetic Reference Field and its temporal change. Spectral analysis of the MAGSURF anomaly field shows a regional scale energy in the wavelength range 145–500 km, due to the presence of various crustal sources. The regional MAGSURF anomaly map shows poor correlation with the corresponding MAGSAT scalar anomaly map, whose power spectrum reveals wavelength components in the range 300–700 km. The MAGSURF data are upward-continued to an elevation of 100 km for comparison with MAGSAT satellite data, downward-continued to the same altitude of 100 km and low-pass filtered for wavelengths larger than 500 km. Upward-continued surface data and downward continued satellite data show good morphological similarity for wavelengths in the range 300–500 km at an altitude of 100 km. Satellite data permit the characterization of magnetic signatures due to sources located in the middle-lower crust of Sardinia, Lombardia, Molise and Dalmatia, while further surface regional anomalies are connected with upper crust bodies of Mid Tyrrhene and East Sicily.
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