Crustal and uppermost mantle structure of Cape Verde from ambient noise tomography

Detalhes bibliográficos
Autor(a) principal: Carvalho, J.
Data de Publicação: 2022
Outros Autores: Silveira, Graça, Kiselev, S, Custódio, Susana, Dos Santos Ramalho, Ricardo, Stutzmann, E, Schimmel, M
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10451/56757
Resumo: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Geophysical Journal International following peer review. The version of record J Carvalho, G Silveira, S Kiselev, S Custódio, R S Ramalho, E Stutzmann, M Schimmel, Crustal and uppermost mantle structure of Cape Verde from ambient noise tomography, Geophysical Journal International, Volume 231, Issue 2, November 2022, Pages 1421–1433, https://doi.org/10.1093/gji/ggac254, is available online at: https://academic.oup.com/gji/article-abstract/231/2/1421/6624981?redirectedFrom=fulltext&login=true
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spelling Crustal and uppermost mantle structure of Cape Verde from ambient noise tomographySeismic noiseSeismic tomographyOceanic hotspotsCrustal structureSurface wavesIntraplate volcanismThis is a pre-copyedited, author-produced PDF of an article accepted for publication in Geophysical Journal International following peer review. The version of record J Carvalho, G Silveira, S Kiselev, S Custódio, R S Ramalho, E Stutzmann, M Schimmel, Crustal and uppermost mantle structure of Cape Verde from ambient noise tomography, Geophysical Journal International, Volume 231, Issue 2, November 2022, Pages 1421–1433, https://doi.org/10.1093/gji/ggac254, is available online at: https://academic.oup.com/gji/article-abstract/231/2/1421/6624981?redirectedFrom=fulltext&login=trueWe present a seismic ambient noise tomography of the Cape Verde archipelago, located in the Atlantic Ocean, approximately 600 km west of Senegal. We used 38 seismic broad-band stations that continuously recorded for 10 months, in order to construct the first 3-D model of Sv-wave velocities for the crust and uppermost mantle beneath the Cape Verde region. We started by computing phase cross-correlations for vertical component recordings using all possible inter-island station pairs. Next, a time–frequency phase-weighted stack was applied to obtain robust Rayleigh-wave group-velocity dispersion curves in the period band between 10 and 24 s. Group-velocity maps at different periods are obtained by inverting the dispersion curves. We then inverted the group-velocity maps to obtain the 3-D shear wave velocity structure of the crust and uppermost mantle beneath Cape Verde. The final 3-D model extends from 8 km down to 23 km and has a lateral resolution of about 50 km. The crust in the southwestern sector, encompassing Fogo, presents lower S-wave velocities that may be caused by the presence of melt pockets and/or hydrothermal fluids circulation. The uppermost mantle beneath the northwestern sector is characterized by higher S-wave velocities in agreement with previous results obtained from Ps and Sp receiver functions. Those high-velocity anomalies can reflect non-altered crust or remnants of magma chambers or solidified basaltic intrusions, which fed the volcanism in these islands. Our maps revealed the presence of crustal underplating across the entire archipelago, yet stronger beneath the groups Santo Antão—São Vicente—São Nicolau and Fogo—Santiago—Maio.Oxford University PressRepositório da Universidade de LisboaCarvalho, J.Silveira, GraçaKiselev, SCustódio, SusanaDos Santos Ramalho, RicardoStutzmann, ESchimmel, M2023-03-22T14:19:29Z2022-07-012022-07-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10451/56757engJ Carvalho, G Silveira, S Kiselev, S Custódio, R S Ramalho, E Stutzmann, M Schimmel, Crustal and uppermost mantle structure of Cape Verde from ambient noise tomography, Geophysical Journal International, Volume 231, Issue 2, November 2022, Pages 1421–1433, https://doi.org/10.1093/gji/ggac25410.1093/gji/ggac254info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-14T15:43:11ZPortal AgregadorONG
dc.title.none.fl_str_mv Crustal and uppermost mantle structure of Cape Verde from ambient noise tomography
title Crustal and uppermost mantle structure of Cape Verde from ambient noise tomography
spellingShingle Crustal and uppermost mantle structure of Cape Verde from ambient noise tomography
Carvalho, J.
Seismic noise
Seismic tomography
Oceanic hotspots
Crustal structure
Surface waves
Intraplate volcanism
title_short Crustal and uppermost mantle structure of Cape Verde from ambient noise tomography
title_full Crustal and uppermost mantle structure of Cape Verde from ambient noise tomography
title_fullStr Crustal and uppermost mantle structure of Cape Verde from ambient noise tomography
title_full_unstemmed Crustal and uppermost mantle structure of Cape Verde from ambient noise tomography
title_sort Crustal and uppermost mantle structure of Cape Verde from ambient noise tomography
author Carvalho, J.
author_facet Carvalho, J.
Silveira, Graça
Kiselev, S
Custódio, Susana
Dos Santos Ramalho, Ricardo
Stutzmann, E
Schimmel, M
author_role author
author2 Silveira, Graça
Kiselev, S
Custódio, Susana
Dos Santos Ramalho, Ricardo
Stutzmann, E
Schimmel, M
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Repositório da Universidade de Lisboa
dc.contributor.author.fl_str_mv Carvalho, J.
Silveira, Graça
Kiselev, S
Custódio, Susana
Dos Santos Ramalho, Ricardo
Stutzmann, E
Schimmel, M
dc.subject.por.fl_str_mv Seismic noise
Seismic tomography
Oceanic hotspots
Crustal structure
Surface waves
Intraplate volcanism
topic Seismic noise
Seismic tomography
Oceanic hotspots
Crustal structure
Surface waves
Intraplate volcanism
description This is a pre-copyedited, author-produced PDF of an article accepted for publication in Geophysical Journal International following peer review. The version of record J Carvalho, G Silveira, S Kiselev, S Custódio, R S Ramalho, E Stutzmann, M Schimmel, Crustal and uppermost mantle structure of Cape Verde from ambient noise tomography, Geophysical Journal International, Volume 231, Issue 2, November 2022, Pages 1421–1433, https://doi.org/10.1093/gji/ggac254, is available online at: https://academic.oup.com/gji/article-abstract/231/2/1421/6624981?redirectedFrom=fulltext&login=true
publishDate 2022
dc.date.none.fl_str_mv 2022-07-01
2022-07-01T00:00:00Z
2023-03-22T14:19:29Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10451/56757
url http://hdl.handle.net/10451/56757
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv J Carvalho, G Silveira, S Kiselev, S Custódio, R S Ramalho, E Stutzmann, M Schimmel, Crustal and uppermost mantle structure of Cape Verde from ambient noise tomography, Geophysical Journal International, Volume 231, Issue 2, November 2022, Pages 1421–1433, https://doi.org/10.1093/gji/ggac254
10.1093/gji/ggac254
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
instacron_str RCAAP
institution RCAAP
reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
collection Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
repository.name.fl_str_mv
repository.mail.fl_str_mv
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