Tomography of subduction zones using regional earthquakes: methodological developments and application to the Ionian slab.

Abstract : The seismicity beneath the southern Italy and Tyrrhenian sea is mostly linked to the subduction process of the Ionian oceanic lithosphere into the Tyrrhenian mantle down to about 500 km in depth. The tomographic techniques applied up to now showed a lack of detail does not allow for discriminating the smaller structures within the larger ones living open many questions on the geodynamic evolution of the area. In this thesis I presented a detailed study of the lithospheric and intra-mantellic structures of the southern Tyrrhenian region by performing a high resolution Local Earthquake Tomography (LET). During this study I developed a post-processing technique called WAM (Weighted Average Model) allows the reconstruction of reliable velocity models of P and S waves. Thanks to WAM it was possible to describe the 3D shape of the Ionian slab and to suggest a new geodynamic scenario of the region based on some petrological inferences.
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Geophysics [physics.geo-ph]. Université de Strasbourg, 2009. English
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Marco Calo'. Tomography of subduction zones using regional earthquakes: methodological developments and application to the Ionian slab.. Geophysics [physics.geo-ph]. Université de Strasbourg, 2009. English. 〈tel-00438598〉

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