This paper deals with the analysis of aeromagnetic data on the Sonma-Vesuvius area. An inverse 2.5D method is used, its main features being a variable strike length and a data set relative to a vertical plane. This last provides a depth resolution, so that the result consists in a magnetic tomography along a vertical section. The magnetic model shows that magnetized rocks extend up to carbonate basement depths (about 2 km). The stronger magnetizations (>6 A/m) are concentrated in the emerged part of the volcano, but high magnetizations are still present down to about 1800 m b.s.l. The magnetization distribution found is then compared to the distribution of;he hypocenters of Vesuvian earthquakes and for shallow depth a positive correlation is noted. At depths greater than about 2 km, i.e. at the level where a geothermal well started to encounter dolomites, the model shows no magnetization, while hypocenters form a nearly continuous vertical belt. This pattern leads to the conclusion that this evidence may be considered as being due to a small volume of the feeding system at these depths or eventually as an indication of strong alteration processes of magnetic rocks. (C) 1998 Elsevier Science B.V. All rights reserved.

2.5D modelling of Somma-Vesuvius structure by aeromagnetic data

FEDI, MAURIZIO;FLORIO, GIOVANNI;
1998

Abstract

This paper deals with the analysis of aeromagnetic data on the Sonma-Vesuvius area. An inverse 2.5D method is used, its main features being a variable strike length and a data set relative to a vertical plane. This last provides a depth resolution, so that the result consists in a magnetic tomography along a vertical section. The magnetic model shows that magnetized rocks extend up to carbonate basement depths (about 2 km). The stronger magnetizations (>6 A/m) are concentrated in the emerged part of the volcano, but high magnetizations are still present down to about 1800 m b.s.l. The magnetization distribution found is then compared to the distribution of;he hypocenters of Vesuvian earthquakes and for shallow depth a positive correlation is noted. At depths greater than about 2 km, i.e. at the level where a geothermal well started to encounter dolomites, the model shows no magnetization, while hypocenters form a nearly continuous vertical belt. This pattern leads to the conclusion that this evidence may be considered as being due to a small volume of the feeding system at these depths or eventually as an indication of strong alteration processes of magnetic rocks. (C) 1998 Elsevier Science B.V. All rights reserved.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/479206
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