Exploring Offshore Sediment Evidence of the 1755 CE Tsunami (Faro, Portugal): Implications for the Study of Outer Shelf Tsunami Deposits - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Minerals Année : 2020

Exploring Offshore Sediment Evidence of the 1755 CE Tsunami (Faro, Portugal): Implications for the Study of Outer Shelf Tsunami Deposits

Vincent Kümmerer
  • Fonction : Auteur
Teresa Drago
  • Fonction : Auteur
Cristina Veiga-Pires
  • Fonction : Auteur
Pedro Silva
  • Fonction : Auteur
Vitor Magalhães
  • Fonction : Auteur
Anxo Mena
  • Fonction : Auteur
Ana Lopes
Ana Isabel Rodrigues
  • Fonction : Auteur
Pedro Terrinha
  • Fonction : Auteur
Maria Ana Baptista
  • Fonction : Auteur

Résumé

Outer shelf sedimentary records are promising for determining the recurrence intervals of tsunamis. However, compared to onshore deposits, offshore deposits are more difficult to access, and so far, studies of outer shelf tsunami deposits are scarce. Here, an example of studying these deposits is presented to infer implications for tsunami-related signatures in similar environments and potentially contribute to pre-historic tsunami event detections. A multidisciplinary approach was performed to detect the sedimentary imprints left by the 1755 CE tsunami in two cores, located in the southern Portuguese continental shelf at water depths of 58 and 91 m. Age models based on 14C and 210Pbxs allowed a probable correspondence with the 1755 CE tsunami event. A multi-proxy approach, including sand composition, grain-size, inorganic geochemistry, magnetic susceptibility, and microtextural features on quartz grain surfaces, yielded evidence for a tsunami depositional signature, although only a subtle terrestrial signal is present. A low contribution of terrestrial material to outer shelf tsunami deposits calls for methodologies that reveal sedimentary structures linked to tsunami event hydrodynamics. Finally, a change in general sedimentation after the tsunami event might have influenced the signature of the 1755 CE tsunami in the outer shelf environment.
Fichier principal
Vignette du fichier
minerals-10-00731-v2-1.pdf (11.47 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03036218 , version 1 (22-01-2021)

Licence

Paternité

Identifiants

Citer

Vincent Kümmerer, Teresa Drago, Cristina Veiga-Pires, Pedro Silva, Vitor Magalhães, et al.. Exploring Offshore Sediment Evidence of the 1755 CE Tsunami (Faro, Portugal): Implications for the Study of Outer Shelf Tsunami Deposits. Minerals, 2020, 10 (9), pp.731. ⟨10.3390/min10090731⟩. ⟨hal-03036218⟩

Collections

INSU EPHE CNRS PSL
43 Consultations
19 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More