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Authors: Monna, S.*
Sgroi, T.*
Dahm, T.*
Title: New insights on volcanic and tectonic structures of the southern Tyrrhenian (Italy) from marine and land seismic data
Title of journal: Geochemistry, Geophysics, Geosystems
Series/Report no.: /14 (2013)
Publisher: American Geophysical Union
Issue Date: 2013
DOI: 10.1002/ggge.20227
Keywords: ocean bottom seismometers
southern Tyrrhenian Sea
seismic tomography
Aeolian Islands
oceanic continental crust
Abstract: We present results from the first crustal seismic tomography for the southern Tyrrhenian area, which includes ocean bottom seismometer (OBS) data and a bathymetry correction. This area comprises Mt. Etna, the Aeolian Islands, and many volcanic seamounts, including the Marsili Seamount. The seismicity distribution in the area depends on the complex interaction between tectonics and volcanism. The 3-D velocity model presented in this study is obtained by the inversion of P wave arrival times from crustal earthquakes. We integrate travel time data recorded by an OBS network (Tyrrhenian Deep Sea Experiment), the SN-1 seafloor observatory, and the land network. Our model shows a high correlation between the P wave anomaly distribution and seismic and volcanic structures. Two main low-velocity anomalies underlie the central Aeolian Islands and Mt. Etna. The two volumes, which are related to the well-known active volcanism, are separated and located at different depths. This finding, in agreement with structural, petrography, and GPS data from literature, confirms the independence of the two systems. The strongest negative anomaly is found below Mt. Etna at the base of the crust, and we associate it with the deep feeding system of the volcano. We infer that most of the seismicity is generated in brittle rock volumes that are affected by the action of hot fluids under high pressure due to the active volcanism in the area. Lateral changes of velocity are related to a transition from the western to the central Aeolian Islands and to the passage from continental crust to the Tyrrhenian oceanic uppermost mantle.
Appears in Collections:04.07.06. Subduction related processes
04.07.04. Plate boundaries, motion, and tectonics
04.06.07. Tomography and anisotropy
04.07.07. Tectonics
04.06.06. Surveys, measurements, and monitoring
Papers Published / Papers in press

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