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Projeto de investigação
Environmental changes: Fluvio-marine interactions over the last 5000yrs - FMI 5000
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A possible Tsunami deposit associated to the CE 1755 Lisbon earthquake on the Western Coast of Portugal
Publication . Tudor, Mihaela; Ramos-Pereira, A.; Costa, Pedro J.M.
The CE 1755 Lisbon tsunami was the largest historical tsunami to affect the Atlantic coasts of Europe and North Africa. This study presents the results obtained from the application of different sedimentological techniques (e.g., grain size, morphoscopy, microtextural analysis, geochemistry, radiocarbon dating) on sediments retrieved from the Alcabrichel River alluvial plain (of about 500 m far away from its mouth and approximatively 50 km northwest of Lisbon, Portugal). The results allowed the identification of a sandy layer that was associated with the CE 1755 tsunami. Furthermore, a new microtextural semi-quantitative classification was applied to enhance the identification of extreme marine inundation deposits. Based on sedimentological data, three different tsunami inundation phases were identified, including two inundations and a likely backwash. This innovative work offers physical evidence of the spatial presence of the CE 1755 tsunami event on the western coast of Europe. It also enables a reconstruction of tsunami inundation dynamics, with two flooding waves and an interspersed backwash.
Insights of the AD 1755 Lisbon tsunami in the estuary of the Alcabrichel River (Portuguese western coast)
Publication . Tudor, M.; Ramos Pereira, A.; Costa, P.
Studies on extreme marine inundations that affected the Portuguese coast refer mainly to the tsunami of AD 1775, considered the most devastating that affected the Portuguese coast. This work is focused on the recognition of a tsunami deposit in Alcabrichel River estuary and presents the analysis of a sediment core CF2. Lithostratigraphic, sedimentological, geochemical, morphoscopic and microtextural analyses revealed a peculiar deposit, a massive layer (10cm), essentially sandy (>90%), interposed between fine sediments and the radiocarbon dating performed under the scope of R&D Project PTDC/CTE-GIX/104035/2008, placing this event in the chronological proximity of the AD 1755 Lisbon tsunami.
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Entidade financiadora
Fundação para a Ciência e a Tecnologia
Programa de financiamento
3599-PPCDT
Número da atribuição
PTDC/CTE-GIX/104035/2008