New Constraints on the Calabrian Arc (Central Mediterranean) Geodynamics: High‐Resolution Imaging of Lithospheric and Upper Mantle Discontinuities From P and S Receiver Functions

The Calabrian Arc subduction system (Central Mediterranean) is characterized by a deep and narrow (200 km) slab. Addressing the poorly understood link between shallow and deep mantle structures, we present the first high-resolution mapping of crustal and upper mantle discontinuities across the Calabrian Arc and Southern Tyrrhenian basin. By applying an advanced joint inversion of P and S receiver functions to a novel, dense data set, we precisely mapped the Moho, the Lithosphere-Asthenosphere Boundary, and the base of a sub-lithospheric low-velocity layer (LVL). Our results clarify key geodynamic signatures: we image clear Moho doubling along the subductive margin of the Tyrrhenian basin and find structural evidence of the lithospheric tears that bound the Ionian slab. Furthermore, the map of the LVL base highlights strong lateral heterogeneities in the upper mantle structure, providing detailed insights into processes related to subduction dynamics and slab tearing.