Shallow seismic stratigraphy of the southwestern Algarve shelf (Portugal) and characteristics of offshore tsunami deposits

Understanding the sedimentary dynamics of continental shelves is crucial for decoding past high-energy events like tsunamis. Based on data from HSV FISÁLIA cruise of the Portuguese Navy, this study investigates the geomorphological features of the southwestern Algarve shelf and the seismo-stratigrap...

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Autores: Feist, Lisa, Costa, Pedro J.M., Santisteban Navarro, Juan Ignacio, Albers, Stijn, Bellanova, Piero, Bosnic, Ivana, De Batist, Marc, Duarte, João F., Rodrigues, Aurora, Reicherter, Klaus
Formato: artículo
Fecha de publicación:2025
País:España
Recursos:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/118309
Acesso em linha:https://hdl.handle.net/20.500.14352/118309
Access Level:acceso abierto
Palavra-chave:551.351(469.6)
Event stratigraphy
Holocene
Sub-bottom acoustic data
Offshore tsunami deposits
Gulf of Cadiz
Infralittoral prograding wedge
Geología estratigráfica
2506.19 Estratigrafía
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spelling Shallow seismic stratigraphy of the southwestern Algarve shelf (Portugal) and characteristics of offshore tsunami depositsFeist, LisaCosta, Pedro J.M.Santisteban Navarro, Juan IgnacioAlbers, StijnBellanova, PieroBosnic, IvanaDe Batist, MarcDuarte, João F.Rodrigues, AuroraReicherter, Klaus551.351(469.6)Event stratigraphyHoloceneSub-bottom acoustic dataOffshore tsunami depositsGulf of CadizInfralittoral prograding wedgeGeología estratigráfica2506.19 EstratigrafíaUnderstanding the sedimentary dynamics of continental shelves is crucial for decoding past high-energy events like tsunamis. Based on data from HSV FISÁLIA cruise of the Portuguese Navy, this study investigates the geomorphological features of the southwestern Algarve shelf and the seismo-stratigraphic characteristics of sedimentary units attributed to two tsunamis that occurred in 1755 CE (Lisbon earthquake) and ca. 3600 cal yr BP. Using high-resolution geoacoustic profiling in combination with sedimentological analyses and radiocarbon dating from prior studies, this study is the first to identify an Infralittoral Prograding Wedge on the shallow southwestern Algarve shelf. Furthermore, remnants of an older transgressive prograding wedge-shaped sediment body have been detected on the mid to outer shelf off Portimão. A crucial finding of this study is a high-amplitude reflector which has been associated with the ca. 3600 cal yr BP tsunami deposit. This reflector is particularly strong based on the corresponding deposit's stark compositional contrast with the surrounding sediment. In its distribution, this reflector is restricted to the base of the Infralittoral Prograding Wedge indicating this wedge as the most likely sediment source for the ca. 3600 cal yr BP deposit. On the other hand, the 1755 CE Lisbon tsunami deposit has no clear geophysical signature on the southwestern Algarve shelf due to its vestigial thicknesses and scarce compositional contrast with the surrounding sediment. This divergence raises significant questions about the different triggering mechanisms and transport processes that define both offshore tsunami deposits. Our findings highlight the significance of local bathymetric conditions, sediment sources, as well as triggering mechanisms and transport pathways in shaping offshore tsunami deposits.ElsevierUniversidad Complutense de Madrid20252025-01-0120252025-01-01journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/118309reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/1183092026-06-02T12:44:21Z
dc.title.none.fl_str_mv Shallow seismic stratigraphy of the southwestern Algarve shelf (Portugal) and characteristics of offshore tsunami deposits
title Shallow seismic stratigraphy of the southwestern Algarve shelf (Portugal) and characteristics of offshore tsunami deposits
spellingShingle Shallow seismic stratigraphy of the southwestern Algarve shelf (Portugal) and characteristics of offshore tsunami deposits
Feist, Lisa
551.351(469.6)
Event stratigraphy
Holocene
Sub-bottom acoustic data
Offshore tsunami deposits
Gulf of Cadiz
Infralittoral prograding wedge
Geología estratigráfica
2506.19 Estratigrafía
title_short Shallow seismic stratigraphy of the southwestern Algarve shelf (Portugal) and characteristics of offshore tsunami deposits
title_full Shallow seismic stratigraphy of the southwestern Algarve shelf (Portugal) and characteristics of offshore tsunami deposits
title_fullStr Shallow seismic stratigraphy of the southwestern Algarve shelf (Portugal) and characteristics of offshore tsunami deposits
title_full_unstemmed Shallow seismic stratigraphy of the southwestern Algarve shelf (Portugal) and characteristics of offshore tsunami deposits
title_sort Shallow seismic stratigraphy of the southwestern Algarve shelf (Portugal) and characteristics of offshore tsunami deposits
dc.creator.none.fl_str_mv Feist, Lisa
Costa, Pedro J.M.
Santisteban Navarro, Juan Ignacio
Albers, Stijn
Bellanova, Piero
Bosnic, Ivana
De Batist, Marc
Duarte, João F.
Rodrigues, Aurora
Reicherter, Klaus
author Feist, Lisa
author_facet Feist, Lisa
Costa, Pedro J.M.
Santisteban Navarro, Juan Ignacio
Albers, Stijn
Bellanova, Piero
Bosnic, Ivana
De Batist, Marc
Duarte, João F.
Rodrigues, Aurora
Reicherter, Klaus
author_role author
author2 Costa, Pedro J.M.
Santisteban Navarro, Juan Ignacio
Albers, Stijn
Bellanova, Piero
Bosnic, Ivana
De Batist, Marc
Duarte, João F.
Rodrigues, Aurora
Reicherter, Klaus
author2_role author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 551.351(469.6)
Event stratigraphy
Holocene
Sub-bottom acoustic data
Offshore tsunami deposits
Gulf of Cadiz
Infralittoral prograding wedge
Geología estratigráfica
2506.19 Estratigrafía
topic 551.351(469.6)
Event stratigraphy
Holocene
Sub-bottom acoustic data
Offshore tsunami deposits
Gulf of Cadiz
Infralittoral prograding wedge
Geología estratigráfica
2506.19 Estratigrafía
description Understanding the sedimentary dynamics of continental shelves is crucial for decoding past high-energy events like tsunamis. Based on data from HSV FISÁLIA cruise of the Portuguese Navy, this study investigates the geomorphological features of the southwestern Algarve shelf and the seismo-stratigraphic characteristics of sedimentary units attributed to two tsunamis that occurred in 1755 CE (Lisbon earthquake) and ca. 3600 cal yr BP. Using high-resolution geoacoustic profiling in combination with sedimentological analyses and radiocarbon dating from prior studies, this study is the first to identify an Infralittoral Prograding Wedge on the shallow southwestern Algarve shelf. Furthermore, remnants of an older transgressive prograding wedge-shaped sediment body have been detected on the mid to outer shelf off Portimão. A crucial finding of this study is a high-amplitude reflector which has been associated with the ca. 3600 cal yr BP tsunami deposit. This reflector is particularly strong based on the corresponding deposit's stark compositional contrast with the surrounding sediment. In its distribution, this reflector is restricted to the base of the Infralittoral Prograding Wedge indicating this wedge as the most likely sediment source for the ca. 3600 cal yr BP deposit. On the other hand, the 1755 CE Lisbon tsunami deposit has no clear geophysical signature on the southwestern Algarve shelf due to its vestigial thicknesses and scarce compositional contrast with the surrounding sediment. This divergence raises significant questions about the different triggering mechanisms and transport processes that define both offshore tsunami deposits. Our findings highlight the significance of local bathymetric conditions, sediment sources, as well as triggering mechanisms and transport pathways in shaping offshore tsunami deposits.
publishDate 2025
dc.date.none.fl_str_mv 2025
2025-01-01
2025
2025-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/118309
url https://hdl.handle.net/20.500.14352/118309
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869405901601898496
score 15.812455

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