Coexisting tectonic settings: the example of the southern Tyrrhenian Sea |
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| Authors: | Marco Cuffaro Federica Riguzzi Davide Scrocca Carlo Doglioni |
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| Institution: | 1.MOX—Dipartimento di Matematica,Politecnico di Milano,Milan,Italy;2.Istituto Nazionale di Geofisica e Vulcanologia,Rome,Italy;3.Dipartimento di Scienze della Terra,Sapienza Università di Roma,Rome,Italy;4.Istituto di Geologia Ambientale e Geoingegneria, CNR,Rome,Italy;5.Istituto di Geologia Ambientale e Geoingegneria, CNR, c/o Dipartimento di Scienze della Terra, Sapienza Università di Roma,Rome,Italy |
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| Abstract: | We performed geodetic strain rate analyses in southern Italy, using new GPS velocities. Two-dimensional strain and rotation
rate fields were estimated and results show that most of the shortening is distributed in the northern Sicily offshore. Extension
becomes more evident and comparable with shortening on the eastern side of the same margin, and greater in the eastern Sicily
offshore. Principal shortening and extension rate axes are consistent with long-term geological features: seismic reflection
profiles show both active compressive and extensional faults affecting Pleistocene strata. We show evidence for contemporaneous
extension and transtension in the Cefalù Basin. Combining geodetic data and geological features point to the coexistence of
independent geodynamic processes, i.e., the active E–W backarc spreading in the hangingwall of the Apennines subduction zone
and shortening along the southern margin of the Tyrrhenian backarc basin operated by the NNW-motion of Africa relative to
Eurasia. |
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