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Backwash sediment record of the 2009 South Pacific Tsunami and 1960 Great Chilean Earthquake Tsunami

dc.rights.licenseopenen_US
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorRIOU, Brieuc
hal.structure.identifierLIttoral ENvironnement et Sociétés [LIENSs]
dc.contributor.authorCHAUMILLON, Eric
hal.structure.identifierUniversity of New South Wales [Sydney] [UNSW]
dc.contributor.authorCHAGUÉ, Catherine
hal.structure.identifierEnvironnements, Dynamiques et Territoires de Montagne [EDYTEM]
dc.contributor.authorSABATIER, Pierre
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorSCHNEIDER, Jean-Luc
hal.structure.identifierUniversity of Rhode Island [URI]
dc.contributor.authorWALSH, John-Patrick
hal.structure.identifierAustralian Nuclear Science and Technology Organisation [Australie] [ANSTO]
dc.contributor.authorZAWADZKI, Atun
hal.structure.identifierAustralian Nuclear Science and Technology Organisation [Australie] [ANSTO]
dc.contributor.authorFIERRO, Daniela
dc.date.accessioned2024-04-02T13:05:22Z
dc.date.available2024-04-02T13:05:22Z
dc.date.issued2020-03-05
dc.identifier.issn2045-2322en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/189127
dc.description.abstractEnFollowing recent tsunamis, most studies have focused on the onshore deposits, while the offshore backwash deposits, crucial for a better understanding of the hydrodynamic processes during such events and offering an opportunity for sedimentary archives of past tsunamis, have mostly been omitted. Here, we present a unique sedimentary record of the backwash from two historical tsunamis sampled in a sheltered bay in American Samoa, namely the 2009 South Pacific Tsunami and the 1960 Great Chilean Earthquake Tsunami. Although not always concomitant with a marked grain size change, backwash deposits are identified by terrestrial geochemical and mineralogical signatures, associated with basal soft sediment micro-deformations. These micro-deformations, including asymmetric flame structures, are described for the first time in historic shallow marine backwash deposits and lead us to propose an improved depositional mechanism for tsunami backflow based on hyperpycnal currents. Moreover, this study brings a potential new criterion to the proxy toolkit for identifying tsunami backwash deposits, namely the basal soft sediment micro-deformations. We suggest that further studies focus on these micro-deformations in order to test the representability of this criterion for tsunami backwash deposits. Sheltered shallow marine environments in areas repeatedly impacted by tsunamis have a higher potential for the reconstruction of paleo-tsunami catalogs and should be preferentially investigated for coastal risk assessment.
dc.language.isoENen_US
dc.rights.urihttp://creativecommons.org/licenses/by-nd/
dc.title.enBackwash sediment record of the 2009 South Pacific Tsunami and 1960 Great Chilean Earthquake Tsunami
dc.typeArticle de revueen_US
dc.identifier.doi10.1038/s41598-020-60746-4en_US
dc.subject.halPlanète et Univers [physics]/Interfaces continentales, environnementen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géomorphologieen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Géophysique [physics.geo-ph]en_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Océanographieen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Stratigraphieen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Volcanologieen_US
bordeaux.journalScientific Reportsen_US
bordeaux.page4149en_US
bordeaux.volume10en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamSEDIMen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-02544141
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccCC BY-NDen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Scientific%20Reports&rft.date=2020-03-05&rft.volume=10&rft.spage=4149&rft.epage=4149&rft.eissn=2045-2322&rft.issn=2045-2322&rft.au=RIOU,%20Brieuc&CHAUMILLON,%20Eric&CHAGU%C3%89,%20Catherine&SABATIER,%20Pierre&SCHNEIDER,%20Jean-Luc&rft.genre=article


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