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Subcircular conduits and dikes offshore the Somma‐Vesuvius volcano revealed by magnetic and seismic data
Author(s) -
Paoletti V.,
Passaro S.,
Fedi M.,
Marino C.,
Tamburrino S.,
Ventura G.
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl070271
Subject(s) - geology , dike , volcano , magnetic anomaly , seismology , dome (geology) , submarine pipeline , lava , seafloor spreading , tectonics , impact crater , volcanic cone , paleontology , oceanography , astronomy , physics
We 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. Four cones emplaced after the Last Glacial Maximum (19 ka), whereas a fifth one emplaced more recently 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.