The recorded evidence of AD 1755 Atlantic tsunami on the Gibraltar coast

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Author(s)

  • Joaquin Rodriguez-Vidal
  • L. Caceres
  • M Abad
  • F Ruiz
  • M González-Regalado
  • C Finlayson
  • G Finlayson
  • D Fa
  • J Rodríguez-Llanes
  • Geoff Bailey

Department/unit(s)

Publication details

JournalJournal of Iberian Geology
DatePublished - 2011
Issue number2
Volume37
Number of pages17
Pages (from-to)177-93
Original languageEnglish

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.

    Research areas

  • Lisbon earthquake, AD 1755 tsunami, run-up, sedimentary record, radiocarbon dating, Gibraltar

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