Seismic velocity structures of southern Italy from tomographic imaging of the Ionian slab and petrological inferences
Article first published online: 14 SEP 2012
© 2012 The Authors Geophysical Journal International © 2012 RAS
Geophysical Journal International
Volume 191, Issue 2, pages 751–764, November 2012
How to Cite
Calò, M., Dorbath, C., Luzio, D., Rotolo, S. G. and D’Anna, G. (2012), Seismic velocity structures of southern Italy from tomographic imaging of the Ionian slab and petrological inferences. Geophysical Journal International, 191: 751–764. doi: 10.1111/j.1365-246X.2012.05647.x
- Issue published online: 9 OCT 2012
- Article first published online: 14 SEP 2012
- Accepted 2012 August 12. Received 2012 July 31; in original form 2011 August 26
- Seismic tomography;
- Subduction zone processes;
- Rheology: crust and lithosphere
In this study we have determined detailed Vp and Vs seismic velocity models of the Ionian lithosphere subducting beneath the Tyrrhenian basin and of the surrounding mantle, by applying a post-processing technique to a large sample of local earthquake tomography studies.
Our seismic velocity models permit us to infer the presence of low velocity anomalies within the slab, which we interpret as regions that are partially hydrated by fluids released during the subduction process. A petrological interpretation of the velocity anomalies gives new details on the magmatism of the volcanic Aeolian arc. Furthermore our velocity models provide a more detailed description of the boundary of the slab and its connection with the large seismically active Tindari-Letojanni strike slip system. Finally these results allow describing in detail some features of the slab as the presence of lateral and vertical tears. In conclusion, the obtained models provide some constraints for inferences on mantle circulation, and on the geodynamical evolution of the central-western Mediterranean.