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The recorded evidence of AD 1755 Atlantic tsunami on the Gibraltar coast
Rodriguez-Vidal, J.; Caceres, L.; Abad, M.; Ruiz, F.; Gonzalez-Regalado, M.; Finlayson, C.; Finlayson, G.; Fa, D.; Rodríguez-Llanes, J.M.; Bailey, G. (2011). The recorded evidence of AD 1755 Atlantic tsunami on the Gibraltar coast. Journal of Iberian Geology 37(2): 177-193. dx.doi.org/10.5209/rev_JIGE.2011.v37.n2.7
In: Journal of Iberian Geology. Universidad Complutense de Madrid: Madrid. ISSN 1698-6180; e-ISSN 0378-102X
Peer reviewed article  
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Author keywords
    Lisbon earthquake; AD 1755 tsunami; run-up; sedimentary record;radiocarbon dating; Gibraltar
Auteurs  Top 
  • Rodriguez-Vidal, J.
  • Caceres, L.
  • Abad, M.
  • Ruiz, F.
  • Gonzalez-Regalado, M.
  • Finlayson, C.
  • Finlayson, G.
  • Fa, D.
  • Rodríguez-Llanes, J.M.
  • Bailey, G.
Abstract
    Evidence of the AD 1755 tsunami consisting of the same type of accretions produced by the re-deposition of earlier sediments, has been recorded at three different height along the coast of Gibraltar: Along a shallow sandy shore, the tsunami wave reached a run-up of 2-3 m, whereas along steep, cliff-lined shores (Rosia Bay) it surpassed 5 m. An overwash deposit was also identified at the bottom of a lagoon (The Inundation), at 0.5 m b.s.l., on the isthmus that joins the Rock with the mainland. Southern submerged platforms (Vladi's Reef) were also affected by the erosional backwash to a depth of 22 m. The tsunamigenic sediments exhibit a bimodal granulometry, mainly composed of sands with a coarser fraction composed of marine faunal shells remains, together with larger clasts derived from the rocky substrate. All remobilized sediments were dated by historical methods and radiocarbon dating.
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