The Sicilian Magrebides thrust belt geometry, related to a sequence of different tectonic steps (compressional, extensional, transcurrent), from the Late Oligocene, seems to occur through several deformations: the first is characterized by fold associations, clivage and foliation, thrust and compressional fault, which shortened the belt in flat-ramp, duplex, enveloping and breaching geometries. The second tectonic step is related to the activation of low-angle extensional faults, connected to the south Tyrrhenian margin evolution, allowing the northward stretching of the belt and re-orientations and inversions of previous structures. A successive shear tectonics consists in strike-, net- or dip-slip fault systems, which allowed the increasing of the Calabrian Arc bending and identification of an hinge-zone between northern Sicily and southern Tyrrhenian. Several of the Plio-Pleistocene brittle structures are still active and sometimes responsible of the shallow seismicity in northern Sicily and its Tyrrhenian off-shore. A preliminary seismotectonic model for the northern Sicilian Maghrebides has been elaborated by an integrated analysis of both structural and seismic data, which also has identified the main unresolved problems.
Adelfio, G., Calò, M., Chiodi, M., di Trapani, F., Giunta, G., Luzio, D., et al. (2008). Un tentativo di analisi integrata della tettonica e sismicità nella zona di cerniera tra Sicilia settentrionale e Basso Tirreno. RENDICONTI ONLINE DELLA SOCIETÀ GEOLOGICA ITALIANA, 1, 5-8.
Un tentativo di analisi integrata della tettonica e sismicità nella zona di cerniera tra Sicilia settentrionale e Basso Tirreno.
ADELFIO, Giada;CHIODI, Marcello;Di Trapani, Francesco Paolo;GIUNTA, Giuseppe;LUZIO, Dario;ORIOLI, Silvia;VITALE, Maria Concetta
2008-01-01
Abstract
The Sicilian Magrebides thrust belt geometry, related to a sequence of different tectonic steps (compressional, extensional, transcurrent), from the Late Oligocene, seems to occur through several deformations: the first is characterized by fold associations, clivage and foliation, thrust and compressional fault, which shortened the belt in flat-ramp, duplex, enveloping and breaching geometries. The second tectonic step is related to the activation of low-angle extensional faults, connected to the south Tyrrhenian margin evolution, allowing the northward stretching of the belt and re-orientations and inversions of previous structures. A successive shear tectonics consists in strike-, net- or dip-slip fault systems, which allowed the increasing of the Calabrian Arc bending and identification of an hinge-zone between northern Sicily and southern Tyrrhenian. Several of the Plio-Pleistocene brittle structures are still active and sometimes responsible of the shallow seismicity in northern Sicily and its Tyrrhenian off-shore. A preliminary seismotectonic model for the northern Sicilian Maghrebides has been elaborated by an integrated analysis of both structural and seismic data, which also has identified the main unresolved problems.File | Dimensione | Formato | |
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