The Tagus River delta landslide, off Lisbon, Portugal. Implications for Marine geo-hazards

Detalhes bibliográficos
Autor(a) principal: Terrinha, Pedro
Data de Publicação: 2019
Outros Autores: Duarte, Henrique, Brito, Pedro, Noiva, João, Ribeiro, Carlos, Omira, Rachid, Baptista, Maria Ana, Miranda, Miguel, Magalhães, Vítor, Cristina, Roque, Cruise Team, Tagusdelta
Tipo de documento: Artigo
Idioma: por
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10174/25741
https://doi.org/doi.org/10.1016/j.margeo.2019.105983
Resumo: The stratigraphy of the Tagus river ebb-tidal delta off Lisbon (Portugal) is investigated using high resolution multichannel seismic reflection profiles with the purpose of searching for sedimentary or erosive features associated with landslides. The Tagus delta is sub-divided in two prograding seismic units of 17 ky to 13 ky and 13 ky to Present based on the calibration of seismic lines using gravity and box-cores in the Tagus pro-delta. We report the existence of a buried landslide with 11 km of length, 3.5 km of width and a maximum thickness of 20 m that accounted for the collapse of half of the upper unit of the Tagus river delta front in Holocene times. The non-collapsed half of the delta front contains extensive shallow gas of still unknown origin and nature. An estimated age of ~8 ky BP for the Tagus delta landslide is proposed based on stratigraphic correlation. The trigger mechanisms of the newly identified Tagus landslide are discussed as well as of the several landslides also found in the lower delta unit. These findings present a first step towards a future assessment of the susceptibility of the nearby coastal areas and the off-shore infrastructures to hazards related to such large collapses.
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spelling The Tagus River delta landslide, off Lisbon, Portugal. Implications for Marine geo-hazardsTagus river - NE AtlanticEbb-tidal deltaSeismic stratigraphySubmarine landslideTsunami hazardThe stratigraphy of the Tagus river ebb-tidal delta off Lisbon (Portugal) is investigated using high resolution multichannel seismic reflection profiles with the purpose of searching for sedimentary or erosive features associated with landslides. The Tagus delta is sub-divided in two prograding seismic units of 17 ky to 13 ky and 13 ky to Present based on the calibration of seismic lines using gravity and box-cores in the Tagus pro-delta. We report the existence of a buried landslide with 11 km of length, 3.5 km of width and a maximum thickness of 20 m that accounted for the collapse of half of the upper unit of the Tagus river delta front in Holocene times. The non-collapsed half of the delta front contains extensive shallow gas of still unknown origin and nature. An estimated age of ~8 ky BP for the Tagus delta landslide is proposed based on stratigraphic correlation. The trigger mechanisms of the newly identified Tagus landslide are discussed as well as of the several landslides also found in the lower delta unit. These findings present a first step towards a future assessment of the susceptibility of the nearby coastal areas and the off-shore infrastructures to hazards related to such large collapses.Elsevier2019-08-09T09:40:16Z2019-08-092019-07-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10174/25741http://hdl.handle.net/10174/25741https://doi.org/doi.org/10.1016/j.margeo.2019.105983porTerrinha, P., Duarte, H., Brito, P., Noiva, J., Ribeiro, C., Omira, R., ... & Roque, C. (2019). The Tagus River delta landslide, off Lisbon, Portugal. Implications for Marine geo-hazards. Marine Geology, 105983.https://www.sciencedirect.com/science/article/pii/S0025322719300957?dgcid=author#ks0005GEOpedro.terrinha@ipma.ptndpedro.brito@ipma.ptjoao.noiva@ipma.ptcribeiro@uevora.ptndndndndndnd398Terrinha, PedroDuarte, HenriqueBrito, PedroNoiva, JoãoRibeiro, CarlosOmira, RachidBaptista, Maria AnaMiranda, MiguelMagalhães, VítorCristina, RoqueCruise Team, Tagusdeltainfo: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:RCAAP2024-01-03T19:19:50Zoai:dspace.uevora.pt:10174/25741Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T01:16:07.912093Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv The Tagus River delta landslide, off Lisbon, Portugal. Implications for Marine geo-hazards
title The Tagus River delta landslide, off Lisbon, Portugal. Implications for Marine geo-hazards
spellingShingle The Tagus River delta landslide, off Lisbon, Portugal. Implications for Marine geo-hazards
Terrinha, Pedro
Tagus river - NE Atlantic
Ebb-tidal delta
Seismic stratigraphy
Submarine landslide
Tsunami hazard
title_short The Tagus River delta landslide, off Lisbon, Portugal. Implications for Marine geo-hazards
title_full The Tagus River delta landslide, off Lisbon, Portugal. Implications for Marine geo-hazards
title_fullStr The Tagus River delta landslide, off Lisbon, Portugal. Implications for Marine geo-hazards
title_full_unstemmed The Tagus River delta landslide, off Lisbon, Portugal. Implications for Marine geo-hazards
title_sort The Tagus River delta landslide, off Lisbon, Portugal. Implications for Marine geo-hazards
author Terrinha, Pedro
author_facet Terrinha, Pedro
Duarte, Henrique
Brito, Pedro
Noiva, João
Ribeiro, Carlos
Omira, Rachid
Baptista, Maria Ana
Miranda, Miguel
Magalhães, Vítor
Cristina, Roque
Cruise Team, Tagusdelta
author_role author
author2 Duarte, Henrique
Brito, Pedro
Noiva, João
Ribeiro, Carlos
Omira, Rachid
Baptista, Maria Ana
Miranda, Miguel
Magalhães, Vítor
Cristina, Roque
Cruise Team, Tagusdelta
author2_role author
author
author
author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Terrinha, Pedro
Duarte, Henrique
Brito, Pedro
Noiva, João
Ribeiro, Carlos
Omira, Rachid
Baptista, Maria Ana
Miranda, Miguel
Magalhães, Vítor
Cristina, Roque
Cruise Team, Tagusdelta
dc.subject.por.fl_str_mv Tagus river - NE Atlantic
Ebb-tidal delta
Seismic stratigraphy
Submarine landslide
Tsunami hazard
topic Tagus river - NE Atlantic
Ebb-tidal delta
Seismic stratigraphy
Submarine landslide
Tsunami hazard
description The stratigraphy of the Tagus river ebb-tidal delta off Lisbon (Portugal) is investigated using high resolution multichannel seismic reflection profiles with the purpose of searching for sedimentary or erosive features associated with landslides. The Tagus delta is sub-divided in two prograding seismic units of 17 ky to 13 ky and 13 ky to Present based on the calibration of seismic lines using gravity and box-cores in the Tagus pro-delta. We report the existence of a buried landslide with 11 km of length, 3.5 km of width and a maximum thickness of 20 m that accounted for the collapse of half of the upper unit of the Tagus river delta front in Holocene times. The non-collapsed half of the delta front contains extensive shallow gas of still unknown origin and nature. An estimated age of ~8 ky BP for the Tagus delta landslide is proposed based on stratigraphic correlation. The trigger mechanisms of the newly identified Tagus landslide are discussed as well as of the several landslides also found in the lower delta unit. These findings present a first step towards a future assessment of the susceptibility of the nearby coastal areas and the off-shore infrastructures to hazards related to such large collapses.
publishDate 2019
dc.date.none.fl_str_mv 2019-08-09T09:40:16Z
2019-08-09
2019-07-01T00:00:00Z
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/10174/25741
http://hdl.handle.net/10174/25741
https://doi.org/doi.org/10.1016/j.margeo.2019.105983
url http://hdl.handle.net/10174/25741
https://doi.org/doi.org/10.1016/j.margeo.2019.105983
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv Terrinha, P., Duarte, H., Brito, P., Noiva, J., Ribeiro, C., Omira, R., ... & Roque, C. (2019). The Tagus River delta landslide, off Lisbon, Portugal. Implications for Marine geo-hazards. Marine Geology, 105983.
https://www.sciencedirect.com/science/article/pii/S0025322719300957?dgcid=author#ks0005
GEO
pedro.terrinha@ipma.pt
nd
pedro.brito@ipma.pt
joao.noiva@ipma.pt
cribeiro@uevora.pt
nd
nd
nd
nd
nd
nd
398
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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