Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/2802
Título: Seismic imaging of the western Iberian crust using ambient noise: Boundaries and internal structure of the Iberian Massif
Autor: Silveira, Graca
Dias, Nuno Afonso
Villasenor, Antonio
Palavras-chave: Seismic interferometry
Ambient noise
Surface-wave tomography
Iberian Peninsula
Iberian Massif
Velocity Structure Beneath
SW Iberia
Data: 18-Mar-2013
Editora: Elsevier Science BV
Citação: SILVEIRA, Graca; DIAS, Nuno Afonso; VILLASENOR, Antonio - Seismic imaging of the western Iberian crust using ambient noise: Boundaries and internal structure of the Iberian Massif. Tectonophysics. ISSN 0040-1951. Vol. 589,nr 5 (2013), p. 186-194.
Resumo: We present new Rayleigh-wave dispersion maps of the western Iberian Peninsula for periods between 8 and 30 s, obtained from correlations of seismic ambient noise, following the recent increase in seismic broadband network density in Portugal and Spain. Group velocities have been computed for each station pair using the empirical Green's functions generated by cross-correlating one-day-length seismic ambient-noise records. The resulting high-path density allows us to obtain lateral variations of the group velocities as a function of period in cells of 0.5 degrees x 0.5 degrees with an unprecedented resolution. As a result we were able to address some of the unknowns regarding the lithospheric structure beneath SW Iberia. The dispersion maps allow the imaging of the major structural units, namely the Iberian Massif, and the Lusitanian and Algarve Meso-Cenozoic basins. The Cadiz Gulf/Gibraltar Strait area corresponds to a strong low-velocity anomaly, which can be followed to the largest period inverted, although slightly shifted to the east at longer periods. Within the Iberian Massif, second-order perturbations in the group velocities are consistent with the transitions between tectonic units composing the massif. (C) 2013 Elsevier B.V. All rights reserved.
Peer review: yes
URI: http://hdl.handle.net/10400.21/2802
ISSN: 0040-1951
Aparece nas colecções:ISEL - Eng. Civil - Artigos

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