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Subcircular conduits and dikes offshore the Somma-Vesuvius volcano revealed by magnetic and seismic data

 

V. Paoletti1, S. Passaro2, M. Fedi1, C. Marino1, S. Tamburrino3, and G. Ventura2,4

 
Dipartimento di Scienze della Terra, dell’Ambiente e delle Risorse, University Federico II, Naples, Italy
IAMC-CNR Istituto per l’Ambiente Marino Costiero, Naples, Italy 
3 IAMC-CNR, UOS di Capo Granitola, Trapani, Italy
4 INGV, Istituto Nazionale di Geofisica e Vulcanologia, Rome, Italy
 
Geophysical Research Letters
 
Abstract
http://www.distar.unina.it/images/ricerca/vulcabuono-krID-U4604041166466oVF-1119x366CorriereMezzogiorno-Web-Mezzogiorno.jpgWe analyzed new magnetic, bathymetric, and seismic data acquired in the offshore sector of Somma-Vesuvius volcano (Italy). We detected a group of high-intensity, short wavelength magnetic anomalies corresponding to partly buried volcanic dome-like structures located by seismic data. The magnetic anomalies are aligned along a NW-SE strike that is the preferential orientation of an eruptive fracture of the pre-19 ka activity of Vesuvius. Three cones emplaced before the Last Glacial Maximum, whereas a fourth one emplaced after 19 ka suggesting a rejuvenation of the eruptive system offshore the volcano in historical times. We also identified a NE-SW elongated magnetic anomaly consistent with a dike-like body associated to an on-land tectonic structure that was active in recent times at Vesuvius. A delta-like area with diffuse low-intensity magnetic anomalies reflects the seaward fronts of lava flows that entered the sea mainly during the Middle Ages