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| Calabrian subduction hinge | |
|---|---|
| Name | Calabrian subduction hinge |
| Location | Mediterranean Sea, southern Italy |
| Type | Subduction zone hinge |
| Coordinates | 38°N 16°E |
| Region | Calabria, Sicily, Ionian Sea |
Calabrian subduction hinge The Calabrian subduction hinge is a localized, migrating hinge within the Ionian slab system that controls the geometry and dynamics of the Mediterranean convergence between the African Plate and the Eurasian Plate. It links the evolution of the Tyrrhenian Basin, the Messina Strait, and the Apennine orogen with seismicity concentrated off the coasts of Calabria, Sicily, and the Ionian Islands. Studies of the hinge integrate evidence from National Research Council (Italy), Istituto Nazionale di Geofisica e Vulcanologia, and international programs involving European Space Agency, United States Geological Survey, and universities across Italy, Greece, and France.
The Calabrian subduction hinge sits at the junction of the convergent margin that juxtaposes the overriding Apennine Mountains and the retreating Ionian slab, influencing back-arc extension in the Tyrrhenian Sea and foreland deformation in the Maghrebide fold and thrust belt. It has been the focus of research by groups associated with INGV, INGV Sezione di Palermo, INGV Sezione di Napoli, and projects funded by the European Research Council and Italian Ministry of University and Research. Its behavior bears on hazards in urban centers such as Reggio Calabria, Messina, and Catanzaro and on offshore infrastructure near the Strait of Messina.
The hinge lies within the Ionian lithosphere bounded by the continental margins of Sicily, Calabria, and the continental promontory of Apulia. It interfaces with the Tyrrhenian back-arc basin formed in concert with the westward retreat of the subducting slab beneath the Apennine subduction system. The broader setting includes the Mediterranean Ridge, the Malta Escarpment, and the Hellenic subduction system near Crete. Tectonic plates and microplates involved include the African Plate, Eurasian Plate, Adriatic Plate, and the Sicily Channel microplate, with mantle flow regimes constrained by profiles from IODP expeditions and seismic tomographic models from groups at GFZ German Research Centre for Geosciences.
Kinematic reconstructions tie the hinge's migration to stages of slab roll-back and trench retreat that drove extension in the Tyrrhenian starting in the Neogene, contemporaneous with shortening in the Apennines and crustal thickening in the Calabrian Arc. Plate motion histories referenced include rotations documented in paleomagnetic records from Sardinia, Corsica, and the Sicily Channel, and GPS measurements from networks such as RING (Rete Integrata Nazionale GPS). The hinge evolution reflects interactions among processes documented in studies of the Messinian Salinity Crisis, Pliocene uplift of the Calabrian Arc, and Late Neogene volcanism at Aeolian Islands, Etna, and Stromboli.
Seismicity concentrated offshore and along the Calabrian margin links to slab-pull forces, hinge rollback, and crustal accommodation processes recorded in catalogs maintained by INGV and the European-Mediterranean Seismological Centre. Significant earthquakes, such as the 1908 Messina earthquake and earlier historical shocks noted in chronicles of Naples and Palermo, illuminate coupling between the subducting slab and the overriding plate. Geodynamic processes include mantle flow and anisotropy detected by shear-wave splitting studies by teams from ETH Zurich, Università di Bologna, and Università di Roma "La Sapienza", and petrological evidence from xenoliths collected near Lipari and Vulcano.
The hinge has migrated southeastward through time by trench retreat and slab rollback, a process evidenced by seismic tomography from institutions such as Bologna University Seismological Observatory and geodynamic models produced by groups at University of Oxford, CNRS, and University of Barcelona. Slab segmentation, slab detachment hypotheses, and variable dip angles in the Ionian slab have been explored in numerical models inspired by work on the Hellenic arc and Calabrian Arc dynamics. Constraints come from deep seismic profiles acquired during cruises by vessels operated by Italian Navy-supported institutions and seismic reflection data from surveys coordinated with ENI geophysical programs.
Surface expressions attributable to the hinge include differential uplift of the Calabrian Arc, coastal cliffs near Tropea and Scilla, and sedimentary depocenters in the Messina Strait and the Catania basin. Fluvial incision patterns on rivers draining the Sila and Aspromonte massifs, marine terraces near Reggio Calabria, and Quaternary stratigraphy studied by teams at University of Palermo and University of Catania record vertical motions tied to hinge-driven tectonics. Volcanic centers in the southern Tyrrhenian, including the Aeolian Islands and Etna, reflect mantle melting anomalies associated with slab geometry.
Investigations combine seismology, marine geophysics, GPS geodesy, remote sensing from platforms including Sentinel-1, gravity and magnetic surveys, and petrology of volcanic products sampled from Vulcano and Stromboli. Deep imaging utilizes tomographic inversions developed at ETH Zurich and Universitat de Barcelona, wide-angle seismic experiments organized with participation from INGV and OGS (Istituto Nazionale di Oceanografia e di Geofisica Sperimentale), and data assimilation in geodynamic codes from University of Grenoble Alpes. Multidisciplinary syntheses published in journals associated with European Geosciences Union and presented at meetings of the American Geophysical Union and European Seismological Commission continue to refine models of hinge behavior.
Category:Geology of Italy Category:Subduction zones Category:Calabria