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

2022-04-22Journal article Restricted access
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dc.contributor.authorSilveira, Graça
dc.contributor.authorDias, Nuno
dc.contributor.authorKiselev, Sergey
dc.contributor.authorStutzmann, Eleonore
dc.contributor.authorCustodio, Susana
dc.contributor.authorSchimmel, Martin
dc.date.accessioned2023-05-23T07:52:00Z
dc.date.available2023-05-23T07:52:00Z
dc.date.issued2022-04-22
dc.description.abstractWe present a new high-resolution three-dimensional (3D) shear wave velocity (Vs) model of the crust and uppermost mantle beneath Portugal, inferred from ambient seismic noise tomography. We use broadband 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 (EGF) for 3900 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 2 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 3D shear wave velocity model. The final 3D model extends from the upper crust (5 km) down to the uppermost mantle (60 km) and has a lateral resolution of similar to 50 km. In the upper and middle crust, 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-Vilarica-Braganca 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 3D 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/publishedVersionpt_PT
dc.identifier.citationSILVEIRA, Graça.; [et al] – Imaging the crust and uppermost mantle structure of Portugal (West Iberia) with seismic ambient noise. Geophysical Journal International. ISSN 0956-540X. Vol. 230, N.º 2 (2022), pp. 1106-1120.pt_PT
dc.identifier.doi10.1093/gji/ggac106pt_PT
dc.identifier.eissn1365-246X
dc.identifier.issn0956-540X
dc.identifier.urihttp://hdl.handle.net/10400.21/16104
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherOxford University Presspt_PT
dc.relationUIDB/50029/2020 - Instituto Dom Luizpt_PT
dc.relationSeIsmic and Geochemical constraints on the Madeira HoTspot system
dc.relationIntegRatEd tools to decipher the genesis and Spatio-TemporaL Evolution of Seismic Sequences.
dc.relationWILAS - West Iberia Lithosphere and Astenosphere Structure
dc.relationAQUAREL - Accurate QUAntification of Regional Earthquakes and Earth structure: appLication to Western Iberia
dc.relationSeismogenic Processes In slowly DEforming Regions
dc.subjectSeismic interferometrypt_PT
dc.subjectSurface waves and free oscillationspt_PT
dc.subjectSeismic tomographypt_PT
dc.subjectCrustal imagingpt_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.awardTitleSeIsmic and Geochemical constraints on the Madeira HoTspot system
oaire.awardTitleIntegRatEd tools to decipher the genesis and Spatio-TemporaL Evolution of Seismic Sequences.
oaire.awardTitleWILAS - West Iberia Lithosphere and Astenosphere Structure
oaire.awardTitleAQUAREL - Accurate QUAntification of Regional Earthquakes and Earth structure: appLication to Western Iberia
oaire.awardTitleSeismogenic Processes In slowly DEforming Regions
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCTA-GEF%2F30264%2F2017/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCTA-GEF%2F6674%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCTE-GIX%2F097946%2F2008/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FCTE-GIX%2F116819%2F2010/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FGEO-FIQ%2F2590%2F2014/PT
oaire.citation.endPage1120pt_PT
oaire.citation.issue2pt_PT
oaire.citation.startPage1106pt_PT
oaire.citation.titleGeophysical Journal Internationalpt_PT
oaire.citation.volume230pt_PT
oaire.fundingStream3599-PPCDT
oaire.fundingStream3599-PPCDT
oaire.fundingStream3599-PPCDT
oaire.fundingStream3599-PPCDT
oaire.fundingStream3599-PPCDT
person.familyNameSilveira
person.familyNameDias
person.familyNameStutzmann
person.familyNameCustódio
person.familyNameSchimmel
person.givenNameGraça
person.givenNameNuno
person.givenNameEleonore
person.givenNameSusana
person.givenNameMartin
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project.funder.identifierhttp://doi.org/10.13039/501100001871
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project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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