The Tagus River delta landslide, off Lisbon, Portugal. Implications for Marine geo-hazards
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , , , , , , |
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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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 |
eu_rights_str_mv |
openAccess |
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) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799136643400073216 |