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Authors: Palano, M.*
Schiavone, D.*
Loddo, M.*
Neri, M.*
Presti, C.*
Quarto, R.*
Todaro, C.*
Neri, G.*
Title: Active upper crust deformation pattern along the southern edge of the Tyrrhenian subduction zone (NE Sicily): Insights from a multidisciplinary approach
Title of journal: Tectonophysics
Series/Report no.: /657 (2015)
Publisher: Elsevier Science Limited
Issue Date: 17-Jul-2015
DOI: 10.1016/j.tecto.2015.07.005
Keywords: subduction edge
seismic velocity structure
Abstract: Using a multidisciplinary dataset based on gravimetric, seismic, geodetic and geological observations,we provide an improved picture of the shallow structure and dynamics of the southern edge of the Tyrrhenian subduction zone.With a local earthquake tomographywe clearly identify twomain crustal domains in the upper 15 kmcharacterized by different P-wave velocity values: a high-velocity domain comprising southeasternmost Tyrrhenian Sea, NE Sicily and Messina Straits, and a low-velocity domain comprising Mt. Etna and eastern Sicily. The transition between the two domains shows a good spatial correspondence with a wider set of faults including the Taormina Fault System (TFS) and the Aeolian–Tindari–Letojanni Fault System (ATLFS), two nearly SE-striking fault systems crossing northeastern Sicily and ending on the Ionian shoreline of Sicily according to many investigators. Within this set of faults, most of the deformation/seismicity occurs along the northern and central segments of ATLFS, compared to lowactivity along TFS. A lack of seismicity (both recent and historical) is observed in the southern sector of ATLFS where, however, geodetic data reveal significant deformation. Ourmultidisciplinary dataset including offshore observations suggests the southeastward continuation of the ATLFS into the Ionian Sea until joiningwith the faults cutting the Ionian accretionarywedge described in the recent literature. Our findings imply the existence of a highly segmented crustal shear zone extending from the Aeolian Islands to the Ionian Abyssal plain, that we believe plays the role of accommodating differential motion between the Southern Tyrrhenian unit and the western compressional domain of Sicily. The ATLFS, which is a main part of the inferred shear zone, behaves similarly to what often observed at the edges of retreating subduction
Appears in Collections:04.07.07. Tectonics
04.07.06. Subduction related processes
04.07.05. Stress
04.07.04. Plate boundaries, motion, and tectonics
04.07.02. Geodynamics
04.07.99. General or miscellaneous
04.06.07. Tomography and anisotropy
04.06.01. Earthquake faults: properties and evolution
04.06.99. General or miscellaneous
04.05.04. Magnetic anomalies
04.05.03. Global and regional models
04.05.99. General or miscellaneous
04.04.09. Structural geology
04.04.06. Rheology, friction, and structure of fault zones
04.04.99. General or miscellaneous
04.03.07. Satellite geodesy
04.03.06. Measurements and monitoring
04.03.05. Gravity variations
04.03.04. Gravity anomalies
04.03.03. Gravity and isostasy
04.03.01. Crustal deformations
04.03.99. General or miscellaneous
04.02.06. Seismic methods
04.02.04. Magnetic and electrical methods
04.02.02. Gravity methods
04.02.99. General or miscellaneous
04.01.99. General or miscellaneous
Papers Published / Papers in press

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