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- W4284964362 abstract "Abstract We derive a three‐dimensional shear‐wave velocity model of the Ligurian‐Provence back‐arc basin (Northwestern Mediterranean Sea) using ocean‐bottom seismometers (AlpArray OBSs) and land stations from permanent and temporary seismic networks. The quality of OBS continuous records is enhanced by a specific processing that reduces instrumental and seabed‐induced noises (transients, tilt, compliance). To further improve the resolution of ambient‐noise tomography in the offshore area, we compute the Rayleigh‐wave part of the Green functions for OBS‐OBS pairs by using onshore stations as virtual sources. 2‐D group‐velocity maps and their uncertainties are computed in the 4–150 s period range by a transdimensional inversion of Rayleigh‐wave travel times. The dispersion data and their uncertainties are inverted for a probabilistic 3‐D shear‐wave velocity model that includes probability densities for V s and for the depth of layer interfaces. The probabilistic model is refined by a linearized inversion that accounts for the water layer in the Ligurian Sea. Our S ‐wave velocity and layer boundary probability models correspond well to a recent, high‐resolution P ‐wave velocity cross‐section derived from controlled‐source seismic profiling along the Ligurian‐Provence basin axis. A joint interpretation of the P ‐ and S ‐wave velocity sections along this profile reveals a thin, anomalous oceanic crust of low P ‐wave velocities but high S ‐wave velocities, intruded by a gabbroic body. The illuminated part of the upper mantle appears to be devoid of serpentinization." @default.
- W4284964362 created "2022-07-10" @default.
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- W4284964362 date "2022-08-01" @default.
- W4284964362 modified "2023-10-17" @default.
- W4284964362 title "Ambient‐Noise Tomography of the Ligurian‐Provence Basin Using the AlpArray Onshore‐Offshore Network: Insights for the Oceanic Domain Structure" @default.
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- W4284964362 doi "https://doi.org/10.1029/2022jb024228" @default.
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