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

Journal of Iberian geology

D. Fa¹  G. Finlayson¹  C. Finlayson¹  F. Ruiz²  M. Abad²  J. Rodríguez-Vidal²  L. M. Cáceres²  M. L. González-Regalado²  G. Bailey³  J. M. Rodríguez-Llanes⁴ 

[1] The Gibraltar Museum;Universidad de Huelva;University of York;Université catholique de Louvain,

关键词: Lisbon earthquake;   

DOI  :  10.5209/rev_JIGE.2011.v37.n2.7

学科分类：地质学

来源: Universidad Complutense de Madrid * Servicio de Publicaciones

【 摘 要 】

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.

【 授权许可】

Unknown