Magnetic anisotropies for tsunami deposits: application to the 3.11

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dc.contributor.authorKon, Sen_AU
dc.contributor.authorNakamura, Nen_AU
dc.contributor.authorGoto, Ken_AU
dc.contributor.authorSugawara, Den_AU
dc.contributor.authorIijima, Yen_AU
dc.contributor.authorChagué-Goff, Cen_AU
dc.contributor.authorGoff, JRen_AU
dc.date.accessioned2015-11-16T05:18:59Zen_AU
dc.date.available2015-11-16T05:18:59Zen_AU
dc.date.issued2013-05-24en_AU
dc.date.statistics2015-11-12en_AU
dc.description.abstractTsunami deposits consist of well-sorted fine sand intercalating with non-marine black organic mud. It is difficult to reveal a transport direction of the deposit if the deposit showed no sedimentary fabrics,such as ripples. The proxy of anisotropy of magnetic susceptibility (AMS) appears to be a promising tool for the study of flow fabrics in recent-tsunami deposits such as Sumatra tsunami (Wassmer et al. 2010). The AMS fabric might allow us to reconstruct transport directions of unconsolidated tsunami sediments during emplacement because AMS provides a cryptic alignment of ferromagnetic and paramagnetic minerals. Such cryptic minerals, such as magnetite or phyllosilicate minerals, would behave as a different emplacement mode in a different hydrodynamic condition. In the AMS fabrics of volcanic rocks, there are large discrepancies between the magnetic lineation and the framework-forming silicate linear fabric. This suggests that the uncorroborated use of bulk AMS to detect flow fabric in tsunami deposits has risks. In this article, we show that the anisotropy of anhysteretic remanent magnetization (AARM) may resolve the difficulties. The combination of inundation eye-witness, SEM, AMS, and AARM confirms the flow pattern of recentand paleo-tsunami deposits from the geoslicer sampleing at Rikuzen-Takata city, Japan during 2011, 11th March Tohoku tsunami. We determined if the sandy deposits are of tsunami from these magnetic anisotropies. © 2013, Japan Geoscience Union.en_AU
dc.identifier.citationKon, S., Nakamura, N., Goto, K., Sugawara, D., Iijima, Y., Chagué-Goff, C., & Goff, J. (May). Magnetic anisotropies for tsunami deposits: Application to the 3.11. Paper presented at the Japan Geoscience Union Meeting, May 19-24, 2013, Makuhari, Chiba, Japan.en_AU
dc.identifier.conferenceenddate24 May 2013en_AU
dc.identifier.conferencenameJapan Geoscience Union Meetingen_AU
dc.identifier.conferenceplaceChiba, Japanen_AU
dc.identifier.conferencestartdate19 May 2013en_AU
dc.identifier.govdoc6289en_AU
dc.identifier.otherMIS25-05en_AU
dc.identifier.urihttp://www2.jpgu.org/meeting/2013/session/PDF/M-IS25/MIS25-05_E.pdfen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/6425en_AU
dc.language.isoenen_AU
dc.publisherJapan Geoscience Unionen_AU
dc.subjectTsunamisen_AU
dc.subjectSanden_AU
dc.subjectFerromagnetic materialsen_AU
dc.subjectJapanen_AU
dc.subjectFabricationen_AU
dc.subjectDepositsen_AU
dc.titleMagnetic anisotropies for tsunami deposits: application to the 3.11en_AU
dc.typeConference Abstracten_AU
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