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Characterization of an Intraplate Seismogenic Zone Using Geophysical and Borehole Data: The Vila Franca de Xira Fault, Portugal

2020Journal article Open access
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dc.contributor.authorCarvalho, João
dc.contributor.authorAlves, Daniela
dc.contributor.authorCabral, João
dc.contributor.authorGhose, Ranajit
dc.contributor.authorBorges, José Fernando
dc.contributor.authorDias, Ruben Pereira
dc.contributor.authorRamalho, Elsa
dc.contributor.authorCaldeira, Bento
dc.contributor.authorCasacão, J.
dc.contributor.authorLeote, Jaime
dc.date.accessioned2021-01-15T17:31:59Z
dc.date.available2021-01-15T17:31:59Z
dc.date.issued2020
dc.description.abstractABSTRACT: The Vila Franca de Xira (VFX) fault is a regional fault zone located about 25 km northeast of Lisbon, affecting Neogene sediments. Recent shear-wave seismic studies show that this complex fault zone is buried beneath Holocene sediments and is deforming the alluvial cover, in agreement with a previous work that proposes the fault as the source of the 1531 Lower Tagus Valley earthquake. In this work, we corroborate these results using S-wave, P-wave, geoelectric, ground-penetrating radar and borehole data, confirming that the sediments deformed by several fault branches are of Upper Pleistocene to Holocene. Accumulated fault vertical offsets of about 3 m are estimated from the integrated interpretation of geophysical and borehole data, including 2D elastic seismic modeling, with an estimated resolution of about 0.5 m. The deformations affecting the Tagus alluvial sediments probably resulted from surface or near-surface rupture of the VFX fault during M similar to 7 earthquakes, reinforcing the fault as the seismogenic source of regional historical events, as in 1531, and highlighting the need for preparedness for the next event.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCarvalho, João... [et.al.] - Characterization of an Intraplate Seismogenic Zone Using Geophysical and Borehole Data: The Vila Franca de Xira Fault, Portugal. In: Seismological Research Letters, 2020, Vol. 91(4), p. 2287-2297pt_PT
dc.identifier.doi10.1785/0220190317pt_PT
dc.identifier.issn0895-0695
dc.identifier.urihttp://hdl.handle.net/10400.9/3530
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSeismological Society of Americapt_PT
dc.relationATESTA - Active Tectonics and Earthquake Scenarios for the Lower Tagus Valley
dc.relationSISMOD / LISMOT - Finite Seismic Source Modeling by Joint Inversion of Seismic and Geodesic Data and Strong ground motion in the Lower Tagus Valey
dc.relationConsolidação de linha de investigaçãona área da Geofísica Aplicada à Arqueologia e Património
dc.relationInstituto Dom Luiz
dc.relationINSTITUTE OF EARTH SCIENCES
dc.relation.publisherversionhttps://doi.org/10.1785/0220190317pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectGeofísicapt_PT
dc.subjectDados geofísicospt_PT
dc.subjectActividade sísmicapt_PT
dc.subjectReflexão sísmicapt_PT
dc.subjectFalha de Vila Franca de Xira (Portugal)pt_PT
dc.titleCharacterization of an Intraplate Seismogenic Zone Using Geophysical and Borehole Data: The Vila Franca de Xira Fault, Portugalpt_PT
dc.typejournal article
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oaire.awardTitleATESTA - Active Tectonics and Earthquake Scenarios for the Lower Tagus Valley
oaire.awardTitleSISMOD / LISMOT - Finite Seismic Source Modeling by Joint Inversion of Seismic and Geodesic Data and Strong ground motion in the Lower Tagus Valey
oaire.awardTitleConsolidação de linha de investigaçãona área da Geofísica Aplicada à Arqueologia e Património
oaire.awardTitleInstituto Dom Luiz
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oaire.citation.endPage2297pt_PT
oaire.citation.issue4pt_PT
oaire.citation.startPage2287pt_PT
oaire.citation.titleSeismological Research Letterspt_PT
oaire.citation.volume91pt_PT
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person.familyNameCarvalho
person.familyNameDias
person.familyNameRamalho
person.familyNameCaldeira
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person.givenNameJoão
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person.givenNameElsa
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