PRIN Project 2010-11 “Active and recent geodynamics of Calabrian Arc andaccretionary complex in the Ionian Sea”: new constraints from geological, geodeticand seismological data

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Abstract

This contribution illustrates the preliminary results of our Research Unit in the PRIN Project 2010-11, whichfocuses on active and recent geodynamics of Calabrian Arc. The integration of the new geological, geodetic andseismological data supports the inferred recent plate boundary reorganization in the central-southern Mediterranean,where the regional GNNS velocity fields point to a deceleration or cessation of Calabrian Arc migration, and toextension along the axis of the Calabrian Arc, accommodated by normal faulting (e.g. Capo Vaticano and MessinaStraits (Aloisi et al., 2012; Pepe et al., 2014; Spampinato et al., 2014). The study of the lateral borders of the Arcrevealed that oblique strike-slip displacement has occurred during its southeastwards migration. Active dextraltranstension is occurring along the NNW-striking Aeolian-Tindari Letojanni fault system, forming the southernboundary of the Arc. It joins to the north other two boundaries characterized by different tectonic regimes, acontractional belt in the southern Tyrrhenian sea, where a tectonic inversion has occurred since the middle Pleistocene,and the extensional one in northeastern Sicily and western Calabria (Palano et al., 2012; Barreca et al., 2014a). Alongthe northern boundary of the Arc, the so-called Pollino line (onshore) and Sibari Line (offshore), active deformation hasbeen documented on folds growing above blind oblique thrust ramps extending offshore, controlling the presentmorphobathymetric pattern (Santoro et al., 2013). Although external to the Calabrian Arc, we also devoted attention tothe front of the Maghrebian thrust belt in western Sicily where we presented the first evidence of historical co-seismicdeformation on a thrust array running from the Belice area to the Sicily Channel (Barreca et al., 2014b). Morphotectonicanalysis and fault numeric modeling of uplifted Pleistocene marine terraces and Holocene paleo-shorelines hasdocumented that most of the uplift along the Calabrian Arc is related to regional processes and the residual to coseismicdisplacement on major faults, both transpressional and transtensional, at the borders, and extensional along thechain axis.
Lingua originaleEnglish
Pagine618-618
Numero di pagine1
Stato di pubblicazionePublished - 2014

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