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Imaging the crust and uppermost mantle structure of Portugal (West Iberia) with seismic ambient noise

2022-04-17Journal article Open access
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dc.contributor.authorSilveira, Graça
dc.contributor.authorDias, Nuno Afonso
dc.contributor.authorKiselev, Sergey
dc.contributor.authorStutzmann, Eleonore
dc.contributor.authorCustódio, Susana
dc.contributor.authorSchimmel, Martin
dc.date.accessioned2023-03-21T10:47:53Z
dc.date.available2023-03-21T10:47:53Z
dc.date.issued2022-04-17
dc.descriptionThis is a pre-copyedited, author-produced PDF of an article accepted for publication in Geophysical Journal International following peer review. The version of record Graça Silveira, Nuno Afonso Dias, Sergey Kiselev, Eleonore Stutzmann, Susana Custódio, Martin Schimmel, Imaging the crust and uppermost mantle structure of Portugal (West Iberia) with seismic ambient noise, Geophysical Journal International, Volume 230, Issue 2, August 2022, Pages 1106–1120, https://doi.org/10.1093/gji/ggac106, is available online at: https://academic.oup.com/gji/article-abstract/230/2/1106/6550028?redirectedFrom=fulltextpt_PT
dc.description.abstractWe present a new high-resolution 3-D shear wave velocity (Vs) model of the crust and uppermost mantle beneath Portugal, inferred from ambient seismic noise tomography. We use broad-band seismic data from a dense temporary deployment covering the entire Portuguese mainland between 2010 and 2012 in the scope of the WILAS project. Vertical component data are processed using phase correlation and phase weighted stack to obtain empirical Green functions (EGFs) for 2016 station pairs. Further, we use a random sampling and subset stacking strategy to measure robust Rayleigh-wave group velocities in the period range 7–30 s and associated uncertainties. The tomographic inversion is performed in two steps: First, we determine group-velocity lateral variations for each period. Next, we invert them at each grid point using a new trans-dimensional inversion scheme to obtain the 3-D shear wave velocity model. The final 3-D model extends from the upper crust (5 km) down to the uppermost mantle (60 km) and has a lateral resolution of ∼50 km. In the upper and middle crusts, the Vs anomaly pattern matches the tectonic units of the Variscan Massif and Alpine basins. The transition between the Lusitanian Basin and the Ossa Morena Zone is marked by a contrast between moderate- and high-velocity anomalies, in addition to two arched earthquake lineations. Some faults, namely, the Manteigas–Vilariça–Bragança fault and the Porto–Tomar–Ferreira do Alentejo fault, have a clear signature from the upper crust down to the uppermost mantle (60 km). Our 3-D shear wave velocity model offers new insights into the continuation of the main tectonic units at depth and contributes to better understanding the seismicity of Portugal.pt_PT
dc.description.versioninfo:eu-repo/semantics/acceptedVersionpt_PT
dc.identifier.citationGraça Silveira, Nuno Afonso Dias, Sergey Kiselev, Eleonore Stutzmann, Susana Custódio, Martin Schimmel, Imaging the crust and uppermost mantle structure of Portugal (West Iberia) with seismic ambient noise, Geophysical Journal International, Volume 230, Issue 2, August 2022, Pages 1106–1120, https://doi.org/10.1093/gji/ggac106pt_PT
dc.identifier.doi10.1093/gji/ggac106pt_PT
dc.identifier.urihttp://hdl.handle.net/10451/56730
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherOxford University Presspt_PT
dc.relationPTDC/CTA-GEF/30264/2017pt_PT
dc.relationPTDC/CTA-GEF/6674/2020pt_PT
dc.relationPTDC/CTE- GIX/097946/2008pt_PT
dc.relationPTDC/CTE-GIX/116819/2010pt_PT
dc.relationPTDC/GEO-FIQ/2590/2014pt_PT
dc.relationFCT UIDB/50029/2020pt_PT
dc.relation.publisherversionhttps://academic.oup.com/gji/article-abstract/230/2/1106/6550028pt_PT
dc.subjectCrustal imagingpt_PT
dc.subjectSeismic interferometrypt_PT
dc.subjectSeismic tomographypt_PT
dc.subjectSurface waves and free oscillationspt_PT
dc.subjectCrustal structurept_PT
dc.titleImaging the crust and uppermost mantle structure of Portugal (West Iberia) with seismic ambient noisept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage1120pt_PT
oaire.citation.issue2pt_PT
oaire.citation.startPage1106pt_PT
oaire.citation.titleGeophysical Journal Internationalpt_PT
oaire.citation.volume230pt_PT
person.familyNameMedeiros da Silveira
person.familyNameDias
person.familyNameCustódio
person.givenNameMaria da Graça
person.givenNameNuno
person.givenNameSusana
person.identifierA-3081-2009
person.identifier1348964
person.identifierK-7598-2012
person.identifier.ciencia-id1116-1080-16F3
person.identifier.ciencia-idDB10-5086-2205
person.identifier.ciencia-id2113-1BF3-9A06
person.identifier.orcid0000-0002-2110-2554
person.identifier.orcid0000-0001-7672-4476
person.identifier.orcid0000-0001-7457-4179
person.identifier.ridB-2778-2008
person.identifier.scopus-author-id6602698071
person.identifier.scopus-author-id56640885300
person.identifier.scopus-author-id15749783000
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationa6ba2183-dfac-4f3e-9607-93cd0a8f926e
relation.isAuthorOfPublication0e565491-33f6-4a75-8292-a833f61599b5
relation.isAuthorOfPublicationdba20f14-b09b-41ec-bb39-4ffad37524d4
relation.isAuthorOfPublication.latestForDiscoverya6ba2183-dfac-4f3e-9607-93cd0a8f926e

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