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. 2019 Mar 5;9(1):3609.
doi: 10.1038/s41598-019-40510-z.

3D Shear Wave Velocity Model of the Crust and Uppermost Mantle Beneath the Tyrrhenian Basin and Margins

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Free PMC article

3D Shear Wave Velocity Model of the Crust and Uppermost Mantle Beneath the Tyrrhenian Basin and Margins

D Manu-Marfo et al. Sci Rep. .
Free PMC article

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Abstract

The Tyrrhenian basin serves as a natural laboratory for back-arc basin studies in the Mediterranean region. Yet, little is known about the crust-uppermost mantle structure beneath the basin and its margins. Here, we present a new 3D shear-wave velocity model and Moho topography map for the Tyrrhenian basin and its margins using ambient noise cross-correlations. We apply a self-parameterized Bayesian inversion of Rayleigh group and phase velocity dispersions to estimate the lateral variation of shear velocity and its uncertainty as a function of depth (down to 100 km). Results reveal the presence of a broad low velocity zone between 40 and 80 km depth affecting much of the Tyrrhenian basin's uppermost mantle structure and its extension mimics the paleogeographic reconstruction of the Calabrian arc in time. We interpret the low-velocity structure as the possible source of Mid-Ocean Ridge Basalts- and Ocean Island Basalts- type magmatic rocks found in the southern Tyrrhenian basin. At crustal depths, our results support an exhumed mantle basement rather than an oceanic basement below the Vavilov basin. The 3D crust-uppermost mantle structure supports a present-day geodynamics with a predominant Africa-Eurasia convergence.

Conflict of interest statement

The authors declare no competing interests.

Figures

Figure 1
Figure 1
Bathymetric and topographic map of the Tyrrhenian basin and surroundings. Black triangles represent the location of broadband stations used in this study. Inset map shows the ray density with all inter-station paths used in this study. VB = Vavilov basin; MB = Marsili basin.
Figure 2
Figure 2
Rayleigh wave tomographic maps. (ah) Group velocity and (i–p) phase velocity maps at periods of 5, 10, 15, 20, 25, 30, 40 and 50 s. Colours represent the percentile deviation from the average velocity at each period shown at the bottom of each plot. Results are shown only for the resolution length shorter than 150 km (Supplementary Fig. S2).
Figure 3
Figure 3
Shear velocity structure in map view and Moho topography map for the study area. (ac) Shear velocity structure at 5, 20 and 60 km depth. (d) Moho topography map for the Tyrrhenian area.
Figure 4
Figure 4
Shear velocity structure along six different cross-sections. The black lines on the cross-sections depict the undulation of the Moho along the profile and the dash-dotted line shows the uncertainties of the Moho depth. The depth scale in the cross sections is exaggerated by a factor of 2 or 3 depending on the length of the profile.
Figure 5
Figure 5
Zoom-in of the crustal velocity model in the Southern Tyrrhenian basin. Section A-A′ is along the active seismic profile by ref..

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