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Crustal seismic structure beneath Portugal and southern Galicia (Western Iberia) and the role of Variscan inheritance

2017-10Journal article Restricted access
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dc.contributor.authorVeludo, Idalina
dc.contributor.authorDias, Nuno
dc.contributor.authorFonseca, Paulo E.
dc.contributor.authorMatias, Luís
dc.contributor.authorCarrilho, Fernando
dc.contributor.authorHaberland, Christian
dc.contributor.authorVillasenor, António
dc.date.accessioned2018-02-27T14:55:39Z
dc.date.available2018-02-27T14:55:39Z
dc.date.issued2017-10
dc.description.abstractThe crustal structure in Western Iberia, is the result of a complex geodynamic history. Most of the surface is covered by rocks dating to the Variscan orogeny, the coastal ranges dominated by Mesozoic structures and Mesocenozoic basins covering partially the mainland. In this study we present the results of a local earthquake tomographic study, performed to image in depth this complex crustal structure down to 24 km depth.& para;& para;The obtained tomograms present a good correlation with the surface geology, in general with higher Vp velocities in the north, and lower Vp velocities in the south. The heterogeneity observed on the surface geology of the Galicia-Tras-os-Montes Zone is well marked, being a relatively thin layer over the smoother structure of the Centro Iberia Zone CIZ. The CIZ crustal block confined between the Porto-Tomar-Ferreira do Alentejo and the Manteigas-Braganqa faults having higher Vp values, enhancing the contrast to the Lusitanian Basin to the west. The Ossa-Morena Zone corresponds to the unit presenting the greater heterogeneity in both Vp and Vp/Vs models, showing also with a complex transition to the South Portuguese Zone and a relatively smooth transition to the Centro Iberian Zone. Unexpectedly, the South Portuguese Zone present an east-west velocity variation with no apparent correspondence with the surface geology. The transition to the coastal Mesocenozoic basins is clearly marked, the Lower Tagus Valley corresponding to a similar to 4 km thick low velocity region.& para;& para;The relocation inland recorded seismicity in the period 2000-2014 allows cleansing some of the alignments and establish their correlation with some of the active structures in Portugal. The model features and seismicity pattern reveal the strong role played by the Variscan heritage.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationVELUDO, Idalina; [et al] – Crustal seismic structure beneath Portugal and southern Galicia (Western Iberia) and the role of Variscan inheritance. Tectonophysics. ISSN 0040-1951. Vol. 717 (2017), pp. 645-664pt_PT
dc.identifier.doi10.1016/j.tecto.2017.08.018pt_PT
dc.identifier.issn0040-1951
dc.identifier.issn1879-3266
dc.identifier.urihttp://hdl.handle.net/10400.21/8144
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationFCT - PTDC/CTEGIX/097946/2008pt_PT
dc.relationPrecise earthquake locations in mainland Portugal and adjacent offshore
dc.relation.publisherversionhttps://ac.els-cdn.com/S0040195117303372/1-s2.0-S0040195117303372-main.pdf?_tid=spdf-326bed65-3ad2-4df9-8f0a-4addf0d7aa2f&acdnat=1519742980_b9e8c52a8592344aa858485edab5e3efpt_PT
dc.subjectPortugalpt_PT
dc.subjectCrustal structurept_PT
dc.subjectSeismic tomographypt_PT
dc.subjectVariscan orogenypt_PT
dc.subjectEarthquakespt_PT
dc.titleCrustal seismic structure beneath Portugal and southern Galicia (Western Iberia) and the role of Variscan inheritancept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitlePrecise earthquake locations in mainland Portugal and adjacent offshore
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FGEO-FIQ%2F3522%2F2012/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FGEO%2F50019%2F2013/PT
oaire.citation.endPage664pt_PT
oaire.citation.startPage645pt_PT
oaire.citation.titleTectonophysicspt_PT
oaire.citation.volume717pt_PT
oaire.fundingStream5876-PPCDTI
oaire.fundingStream5876
person.familyNameDias
person.givenNameNuno
person.identifier1348964
person.identifier.ciencia-idDB10-5086-2205
person.identifier.orcid0000-0001-7672-4476
person.identifier.ridB-2778-2008
person.identifier.scopus-author-id56640885300
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
rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationd7e4c7da-29b6-439f-ab4a-f5d94c1d7ca5
relation.isAuthorOfPublication.latestForDiscoveryd7e4c7da-29b6-439f-ab4a-f5d94c1d7ca5
relation.isProjectOfPublicationd56f2ba5-9503-44cf-b3e5-d9f50937c97f
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