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Tectonic expression of an active slab tear from high‐resolution seismic and bathymetric data offshore Sicily (Ionian Sea)

Authors: Marc-André Gutscher; Stéphane Dominguez; Bernard Mercier de Lépinay; Luis M. Pinheiro; Flora Gallais; Nathalie Babonneau; Antonio Cattaneo; +4 Authors

Tectonic expression of an active slab tear from high‐resolution seismic and bathymetric data offshore Sicily (Ionian Sea)

Abstract

Subduction of a narrow slab of oceanic lithosphere beneath a tightly curved orogenic arc requires the presence of at least one lithospheric scale tear fault. While the Calabrian subduction beneath southern Italy is considered to be the type example of this geodynamic setting, the geometry, kinematics and surface expression of the associated lateral, slab tear fault offshore eastern Sicily remain controversial. Results from a new marine geophysical survey conducted in the Ionian Sea, using high-resolution bathymetry and seismic profiling reveal active faulting at the seafloor within a 140 km long, two-branched fault system near Alfeo Seamount. The previously unidentified 60 km long NW trending North Alfeo Fault system shows primarily strike-slip kinematics as indicated by the morphology and steep-dipping transpressional and transtensional faults. Available earthquake focal mechanisms indicate dextral strike-slip motion along this fault segment. The 80 km long SSE trending South Alfeo fault system is expressed by one or two steeply dipping normal faults, bounding the western side of a 500+ m thick, 5 km wide, elongate, syntectonic Plio-Quaternary sedimentary basin. Both branches of the fault system are mechanically capable of generating magnitude 6–7 earthquakes like those that struck eastern Sicily in 1169, 1542, and 1693.

peer-reviewed

Countries
Germany, France, France, Italy, Malta, Italy, France, France, France
Subjects by Vocabulary

Microsoft Academic Graph classification: Active fault Fault (geology) Lithosphere geography geography.geographical_feature_category Subduction Sedimentary basin Strike-slip tectonics Seafloor spreading Tectonics Geology Seismology

Keywords

bathymetry, Earthquakes -- Italy -- Sicily, Mediterranean, Geochemistry and Petrology, active faults, [SDU.STU.TE]Sciences of the Universe [physics]/Earth Sciences/Tectonics, Geophysics -- Italy -- Research, Geophysics, seismics, Seismology -- Italy -- Sicily, Suture zones (Structural geology) -- Italy -- Sicily, subduction, Geodynamics -- Italy -- Sicily, slab tear, Faults (Geology) -- Italy -- Sicily

25 references, page 1 of 3

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Argnani, A. (2014), Comment on the article “Propagation of a lithospheric tear fault (STEP) through the western boundary of the Calabrian accretionary wedge offshore eastern Sicily (southern Italy)” by Gallais et al., 2013 Tectonophysics, Tectonophysics, 610, 195-199. [OpenAIRE]

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 1%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
75
Top 10%
Top 10%
Top 1%
bronze
Funded by
EC| SCARP
Project
SCARP
Canyon and landslide processes of non-tropical carbonate escarpments.
  • Funder: European Commission (EC)
  • Project Code: 618149
  • Funding stream: FP7 | SP3 | PEOPLE
,
EC| ASTARTE
Project
ASTARTE
Assessment, STrategy And Risk Reduction for Tsunamis in Europe
  • Funder: European Commission (EC)
  • Project Code: 603839
  • Funding stream: FP7 | SP1 | ENV
Validated by funder | sysimport:crosswalk
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