Journal
MINERALS
Volume 10, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/min10090731
Keywords
1755 CE tsunami; backwash; Holocene sediments; high-energy event; offshore tsunami sediments; quartz microtexture
Funding
- ASTARTE project Assessment, STrategy and Risk Reduction for Tsunamis in Europe [603839]
- EC (FP7), MOWER project Rasgos Erosivos Y Depositos Arenosos Generados Por La Mow Alrededor De Iberia: Implicaciones Paleoceanograficas, Sedimentarias Y Economicas [CTM 2012-39599-C03]
- Portuguese Foundation of Science and Technology (FCT) from CIMA [UID/0350/2020]
- IDL [UIDB/50019/2020]
- FCT [SFRH/BD/147685/2019]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/147685/2019] Funding Source: FCT
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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 C-14 and Pb-210(xs) 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.
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