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- W98210945 abstract "The northern coast of Sicily and its offshore area represent a hinge zone between a sector of the TyrrhenianBasin, characterized by the strongest crustal thinning, and the sector of the Sicilian belt which has emerged. Thishinge zone is part of a wider W-E trending right-lateral shear zone, which has been affecting the MaghrebianChain units since the Pliocene. Seismological and structural data have been used to evaluate the seismotectonicbehavior of the area investigated here. Seismological analysis was performed on a data set of about 2100 seismicevents which occurred between January 1988 and October 2002 in the Southern Tyrrhenian Sea. This paperfocuses in particular on a set of data relating to the period from 6th September 2002, including both the mainshock and about 540 aftershocks of the Palermo seismic sequence. The distribution of the hypocenters revealedthe presence of two main seismogenic zones. The events of the easternmost zone may be related to the Ionianlithospheric slab diving beneath the Calabrian Arc. The seismicity associated with the westernmost zone is closelyclustered around a sub-horizontal regression plane contained within the thinned Southern Tyrrhenian crust,hence suggesting that this seismogenic zone is strictly connected to the deformation field active within the hingezone. On the basis of both structural and seismological data, the brittle deformation pattern is characterized byhigh-angle faults, mainly represented by transcurrent synthetic right-lateral and antithetic left-lateral systems,producing both restraining/uplifting and releasing/subsiding zones which accommodate strains developing in responseto the current stress field (characterized by a maximum axis trending NW-SE) which has been active inthe area since the Pliocene. The cluster of the seismic sequence which started with the 6th September 2002'smain shock is located within the hinge zone. The distribution of the hypocenters relative to this sequence emphasizesthe presence of a high-angle NE-SW-oriented deformation belt within which several shear surfaces areconsidered to be found sub-parallel to that established for the main shock. The kinematics of all these structuresis consistent with a compressive right-lateral focal mechanism." @default.
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- W98210945 date "2009-12-18" @default.
- W98210945 modified "2023-10-02" @default.
- W98210945 title "The Palermo (Sicily) seismic cluster of September 2002, in the seismotectonic framework of the Tyrrhenian Sea-Sicily border area" @default.
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- W98210945 doi "https://doi.org/10.4401/ag-3373" @default.
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