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http://hdl.handle.net/2122/12693
Authors: | Molinari, Irene* Verbeke, Julie* Boschi, Lapo* Kissling, Edi* Morelli, Andrea* |
Title: | Italian and Alpine three-dimensional crustal structure imaged by ambient-noise surface-wave dispersion | Journal: | Geochemistry Geophysics Geosystem | Series/Report no.: | /16 (2015) | Issue Date: | Dec-2015 | DOI: | 10.1002/ 2015GC006176 | Keywords: | Italian crust Tomography surface wave ambient noise Moho |
Subject Classification: | 04.06. Seismology 04.01. Earth Interior |
Abstract: | We derive the 3-D crustal structure (S wave velocity) underneath Italy and the Alpine region, expanding and exploiting the database of ambient noise Rayleigh-wave phase- and group-velocity of Ver- beke et al. (2012). We first complement the database of Verbeke et al. (2012) with a dense set of new ambient-noise-based phase-velocity observations. We next conduct a suite of linear least squares inversion of both phase- and group-velocity data, resulting in 2-D maps of Rayleigh-wave phase and group velocity at periods between 5 and 37 s. At relatively short periods, these maps clearly reflect the surface geology of the region, e.g., low velocity zones at the Po Plain; at longer periods, deeper structures such as Moho topogra- phy under Alps and Apennines, and lower-crust anomalies are revealed. Our phase- and group-velocity models are next inverted via the Neighbourhood Algorithm to determine a set of one-dimensional shear- velocity models (one per phase/group-velocity pixel), resulting in a new three-dimensional model of shear velocity (vS) parameterized in the same way as the European reference crustal model EPcrust. We also show S how well vS is constrained by phase and group dispersion curves. The model shows the low velocity area beneath the Po Plain and the Molasse basin; the contrast between the low-velocity crust of the Adriatic domain and the high-velocity crust of the Tyrrhenian domain is clearly seen, as well as an almost uniform crystalline crust beneath the Alpine belt. Our results are discussed from the geological/geodynamical stand- point, and compared to those of other, interdisciplinary studies. |
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