Publication Date:
2017-04-04
Description:
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
Description:
Published
Description:
205-218
Description:
1T. Geodinamica e interno della Terra
Description:
2T. Tettonica attiva
Description:
3T. Pericolosità sismica e contributo alla definizione del rischio
Description:
1A. Geomagnetismo e Paleomagnetismo
Description:
6A. Monitoraggio ambientale, sicurezza e territorio
Description:
JCR Journal
Description:
restricted
Keywords:
subduction edge
;
seismic velocity structure
;
04. Solid Earth::04.01. Earth Interior::04.01.99. General or miscellaneous
;
04. Solid Earth::04.02. Exploration geophysics::04.02.99. General or miscellaneous
;
04. Solid Earth::04.02. Exploration geophysics::04.02.02. Gravity methods
;
04. Solid Earth::04.02. Exploration geophysics::04.02.04. Magnetic and electrical methods
;
04. Solid Earth::04.02. Exploration geophysics::04.02.06. Seismic methods
;
04. Solid Earth::04.03. Geodesy::04.03.99. General or miscellaneous
;
04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
;
04. Solid Earth::04.03. Geodesy::04.03.03. Gravity and isostasy
;
04. Solid Earth::04.03. Geodesy::04.03.04. Gravity anomalies
;
04. Solid Earth::04.03. Geodesy::04.03.05. Gravity variations
;
04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring
;
04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy
;
04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous
;
04. Solid Earth::04.04. Geology::04.04.06. Rheology, friction, and structure of fault zones
;
04. Solid Earth::04.04. Geology::04.04.09. Structural geology
;
04. Solid Earth::04.05. Geomagnetism::04.05.99. General or miscellaneous
;
04. Solid Earth::04.05. Geomagnetism::04.05.03. Global and regional models
;
04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies
;
04. Solid Earth::04.06. Seismology::04.06.99. General or miscellaneous
;
04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution
;
04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy
;
04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous
;
04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics
;
04. Solid Earth::04.07. Tectonophysics::04.07.04. Plate boundaries, motion, and tectonics
;
04. Solid Earth::04.07. Tectonophysics::04.07.05. Stress
;
04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes
;
04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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