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Crustal and uppermost mantle structure near the Gloria Fault, North Atlantic, from ocean bottom seismometer surface wave observations

2023-11-03Research article Open access
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authorProfile.emailbiblioteca@isel.pt
datacite.subject.fosCiências Naturais::Ciências Físicas
dc.contributor.authorPinzón, Juan I.
dc.contributor.authorCustódio, Susana
dc.contributor.authorSilveira, Graça
dc.contributor.authorKrüger, Frank
dc.contributor.authorMata, João
dc.contributor.authorMatias, Luis
dc.date.accessioned2025-09-18T12:58:50Z
dc.date.available2025-09-18T12:58:50Z
dc.date.issued2023-11-03
dc.description.abstractIn this work, we present both 1-D and 3-D shear wave velocity (Vs) models of the oceanic crust and uppermost mantle below the Deep OCean Test ARray area, located similar to 70 km north of the central section of the Gloria Fault, in the eastern North-Atlantic Ocean. The velocity models are inferred from the dispersion of surface waves recorded on ocean bottom seismometers. Dispersion measurements are obtained from the analysis of ambient seismic noise at short periods (< 14 s) and teleseismic surface waves at long periods (> 14 s) using the two-station method. The 1-D Vs model is inferred from the joint inversion of Rayleigh wave phase velocities and Love wave group and phase velocities. The 3-D tomographic model is obtained by inversion of 2-D Love wave group velocity maps as a function of depth, further constrained by the average of Love wave phase velocities obtained from ambient noise (4-9 s) and the average Rayleigh and Love wave phase velocities calculated from teleseismic data (14-44 s).The 1-D Vs model shows a sediment layer with a low velocity of 1.05 km s-1, similar to previous studies in the region. Below the sediments, we find an oceanic crust with velocities ranging from 3.3 to 4.5 km s(-1). The model reaches an unusually high velocity of 4.9 km s(-1) in a 20 km thick layer at depths between 16 and 36 km. We interpret this fast velocity layer as indicative of the presence of harzburgite, a residue of enhanced melting that might have been formed by the proximity between the Mid-Atlantic Ridge and the Azores mantle plume. At greater depths the velocity decreases, forming a low-velocity zone that reaches a minimum at similar to 70 km depth, which we interpret as the maximum depth for the lithosphere-asthenosphere boundary. The 3-D model shows a structure that is mostly horizontally layered, with Vs isocontours at 3.5-4.5 km s(-1) highlighting oscillations of the crustal structure with wavelengths of similar to 25-30 km. These oscillations may be due to changes in the rate of mantle upwelling and magma supply rate.eng
dc.identifier.citationPinzón, J. I., Custódio, S., Silveira, G., Krüger, F., Mata, J., & Matias, L. (2023). Crustal and uppermost mantle structure near the Gloria Fault, North Atlantic, from ocean bottom seismometer surface wave observations. Geophysical Journal International, 236(1), 1-13. https://doi.org/10.1093/gji/ggad405
dc.identifier.doihttps://doi.org/10.1093/gji/ggad405
dc.identifier.eissn1365-246X
dc.identifier.issn0956-540X
dc.identifier.urihttp://hdl.handle.net/10400.21/22145
dc.language.isoeng
dc.peerreviewedyes
dc.publisherOxford Univ Press
dc.relationInstituto Dom Luiz
dc.relationPD/BD/135069/2017
dc.relation.hasversionhttps://academic.oup.com/gji/article/236/1/1/7324821?login=true
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectSeismic noise
dc.subjectSeismic tomography
dc.subjectSurface waves and free oscillations
dc.subjectCrustal structure
dc.titleCrustal and uppermost mantle structure near the Gloria Fault, North Atlantic, from ocean bottom seismometer surface wave observationseng
dc.typeresearch article
dspace.entity.typePublication
oaire.awardTitleInstituto Dom Luiz
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50019%2F2020/PT
oaire.citation.endPage13
oaire.citation.issue1
oaire.citation.startPage1
oaire.citation.titleGeophysical Journal International
oaire.citation.volume236
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43
person.familyNameCustódio
person.familyNameSilveira
person.familyNameMatias
person.givenNameSusana
person.givenNameGraça
person.givenNameLuis
person.identifierK-7598-2012
person.identifier91922
person.identifier693396
person.identifier.ciencia-id2113-1BF3-9A06
person.identifier.ciencia-id1116-1080-16F3
person.identifier.ciencia-id6418-129D-A73E
person.identifier.orcid0000-0001-7457-4179
person.identifier.orcid0000-0002-2110-2554
person.identifier.orcid0000-0002-8086-4874
person.identifier.ridA-3081-2009
person.identifier.ridK-7347-2012
person.identifier.scopus-author-id15749783000
person.identifier.scopus-author-id6602698071
person.identifier.scopus-author-id6701795172
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
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