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  Shear‐Velocity Structure and Dynamics Beneath the Sicily Channel and Surrounding Regions of the Central Mediterranean Inferred From Seismic Surface Waves

Agius, M. R., Magrini, F., Diaferia, G., Kästle, E. D., Cammarano, F., Faccenna, C., Funiciello, F., van der Meijde, M. (2022): Shear‐Velocity Structure and Dynamics Beneath the Sicily Channel and Surrounding Regions of the Central Mediterranean Inferred From Seismic Surface Waves. - Geochemistry Geophysics Geosystems (G3), 23, 10, e2022GC010394.
https://doi.org/10.1029/2022GC010394

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Agius, M. R.1, Autor
Magrini, F.1, Autor
Diaferia, G.1, Autor
Kästle, E. D.1, Autor
Cammarano, F.1, Autor
Faccenna, Claudio2, Autor              
Funiciello, F.1, Autor
van der Meijde, M.1, Autor
Affiliations:
1External Organizations, ou_persistent22              
24.1 Lithosphere Dynamics, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146034              

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 Zusammenfassung: The evolution of the Sicily Channel Rift Zone (SCRZ) is thought to accommodate the regional tectonic stresses of the Calabrian subduction system. Much of the observations we have today are either limited to the surface or to the upper crust or deeper from regional seismic tomography, missing important details about the lithospheric structure and dynamics. It is unclear whether the rifting is passive from far-field extensional stresses or active from mantle upwelling beneath. We measure Rayleigh-and Love-wave phase velocities from ambient seismic noise and invert for 3-D shear-velocity and radial anisotropic models. Variations in crustal S-velocities coincide with topographic and tectonic features. The Tyrrhenian Sea has a ∼10 km thin crust, followed by the SCRZ (∼20 km). The thickest crust is beneath the Apennine-Maghrebian Mountains (∼55 km). Areas experiencing extension and intraplate volcanism have positive crustal radial anisotropy (VSH > VSV); areas experiencing compression and subduction-related volcanism have negative anisotropy. The crustal anisotropy across the Channel shows the extent of the extension. Beneath the Tyrrhenian Sea, we find very low sub-Moho S-velocities. In contrast, the SCRZ has a thin mantle lithosphere underlain by a low-velocity zone. The lithosphere-asthenosphere boundary rises from 60 km depth beneath Tunisia to ∼33 km beneath the SCRZ. Negative radial anisotropy in the upper mantle beneath the SCRZ is consistent with vertical mantle flow. We hypothesize a more active mantle upwelling beneath the rift than previously thought from an interplay between poloidal and toroidal fluxes related to the Calabrian slab, which in turn produces uplift at the surface and induces volcanism.

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 Datum: 2022-10-132022
 Publikationsstatus: Final veröffentlicht
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 Identifikatoren: DOI: 10.1029/2022GC010394
GFZPOF: p4 T3 Restless Earth
OATYPE: Hybrid Open Access
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Titel: Geochemistry Geophysics Geosystems (G3)
Genre der Quelle: Zeitschrift, SCI, Scopus, oa , OA seit 15. September 2021
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Seiten: - Band / Heft: 23 (10) Artikelnummer: e2022GC010394 Start- / Endseite: - Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals159
Publisher: American Geophysical Union (AGU)
Publisher: Wiley