Articles | Volume 13, issue 3
https://doi.org/10.5194/se-13-659-2022
https://doi.org/10.5194/se-13-659-2022
Research article
 | 
21 Mar 2022
Research article |  | 21 Mar 2022

Radial anisotropy and S-wave velocity depict the internal to external zone transition within the Variscan orogen (NW Iberia)

Jorge Acevedo, Gabriela Fernández-Viejo, Sergio Llana-Fúnez, Carlos López-Fernández, Javier Olona, and Diego Pérez-Millán

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Cited articles

Acevedo J., Fernández-Viejo, G., Llana-Fúnez, S., López-Fernández, C., and Olona, J.: Ambient noise tomography of the southern sector of the Cantabrian Mountains, NW Spain, Geophys. J. Int., 219, 479–495, https://doi.org/10.1093/gji/ggz308, 2019. 
Acevedo, J., Fernández-Viejo, G., Llana-Fúnez, S., López-Fernández, C., and Olona, J.: Upper crustal seismic anisotropy in the Cantabrian Mountains (North Spain) from shear-wave splitting and ambient noise interferometry analysis, Seismol. Res. Lett., 92, 421–436, https://doi.org/10.1785/0220200103, 2020. 
Aller, J. and Gallastegui, J.: Analysis of kilometric-scale superposed folding in the Central Coal Basin (Cantabrian zone, NW Spain), J. Struct. Geol., 17, 961–969, https://doi.org/10.1016/0191-8141(94)00115-G, 1995. 
Almqvist, B. S. and Mainprice, D.: Seismic properties and anisotropy of the continental crust: Predictions based on mineral texture and rock microstructure, Rev. Geophys., 55, 367–433, https://doi.org/10.1002/2016RG000552, 2017. 
Alonso, J. L.: Fold reactivation involving angular unconformable sequences: theoretical analysis and natural examples from the Cantabrian Zone (Northwest Spain), Tectonophysics, 170, 57–77, https://doi.org/10.1016/0040-1951(89)90103-0, 1989. 
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Short summary
The NW Iberian Peninsula provides one of the most complete Variscan sections in Europe, showing the transition between a sedimentary domain with folds and thrust and a metamorphic domain with igneous intrusions. By processing the seismic ambient noise recorded by several seismograph networks in this area, new 3-D S-wave velocity and radial anisotropy models were created. These models reveal the limit between the two domains, delineating the core of the large western European Variscan Belt.