Using magnetic fabric to reconstruct the dynamics of tsunami deposition on the Sendai Plain, Japan — the 2011 Tohoku-oki tsunami

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dc.contributor.authorSchneider, JLen_AU
dc.contributor.authorChagué-Goff, Cen_AU
dc.contributor.authorBouchez, JLen_AU
dc.contributor.authorGoff, JRen_AU
dc.contributor.authorSugawara, Den_AU
dc.contributor.authorGoto, Ken_AU
dc.contributor.authorJaffe, BEen_AU
dc.contributor.authorRichmond, Ben_AU
dc.date.accessioned2020-06-10T23:37:47Zen_AU
dc.date.available2020-06-10T23:37:47Zen_AU
dc.date.issued2014-12-01en_AU
dc.date.statistics2020-06-01en_AU
dc.description.abstractThe magnetic fabric and grain size of sand deposits emplaced during the 2011 Tohoku-oki tsunami were studied in five trenches along a 1800 m long shore normal transect on the Sendai plain as well as in a near shore sedimentary infill of a scour depression. The magnetic susceptibility in all deposits is due to ferromagnetic minerals (mainly magnetite) making the anisotropy of magnetic susceptibility (magnetic fabric) suitable for fabric analyses. The dominant magnetic fabric is planar in all trenches and stronger in finer-grained inland deposits than in the coarser sediments. This planar fabric is related to tractive shearing of the bedload basal portion of the tsunami flow that led to the deposition of traction carpet layers. Among the various fabric parameters used for this study, the vertical evolution of the shape factor (q) of the magnetic ellipsoid in each trench follows the evolution of the magnetic lineation (L) and foliation (F). These parameters provide information on the hydrodynamic energy (flow speed) fluctuations during the emplacement of the tsunami deposit. For the most proximal deposits, characterized by well-sorted reworked beach sand with minor fluctuations in grain-size distribution, the magnetic fabric is sensitive to hydrodynamic energy variations during sedimentation. Reconstruction of tsunami flow orientation in the sediments, based on the orientation of the mean Kmax calculated for each trench, appears to be unambiguous only for the sandy infills of small topographic depressions. The variations in flow direction indicators elsewhere could be related to local variation of the flow and to micro-topographic effects. These findings are encouraging for the use of the magnetic fabric proxy in the study of paleotsunami deposits. © 2014 Elsevier B.V.en_AU
dc.identifier.citationSchneider, J. L., Chagué-Goff, C., Bouchez, J. L., Goff, J., Sugawara, D., Goto, K., Jaffe, B., & Richmond, B. (2014) Using magnetic fabric to reconstruct the dynamics of tsunami deposition on the Sendai Plain, Japan — the 2011 Tohoku-oki tsunami. Marine Geology, 358, 89-106. doi:10.1016/j.margeo.2014.06.010en_AU
dc.identifier.govdoc9625en_AU
dc.identifier.issn0025-3227en_AU
dc.identifier.journaltitleMarine Geologyen_AU
dc.identifier.pagination89-106en_AU
dc.identifier.urihttps://doi.org/10.1016/j.margeo.2014.06.010en_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9546en_AU
dc.identifier.volume358en_AU
dc.language.isoenen_AU
dc.publisherElsevier B.V.en_AU
dc.subjectTsunamisen_AU
dc.subjectAnisotropyen_AU
dc.subjectJapanen_AU
dc.subjectGrain sizeen_AU
dc.subjectSanden_AU
dc.subjectFerromagnetic materialsen_AU
dc.subjectSedimentsen_AU
dc.titleUsing magnetic fabric to reconstruct the dynamics of tsunami deposition on the Sendai Plain, Japan — the 2011 Tohoku-oki tsunamien_AU
dc.typeJournal Articleen_AU
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