Possible paleo-tsunami deposits at Rikuzentakata City, Japan

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dc.contributor.authorIijima, Yen_AU
dc.contributor.authorSugawara, Den_AU
dc.contributor.authorGoto, Ken_AU
dc.contributor.authorChagué-Goff, Cen_AU
dc.contributor.authorHayase, Ren_AU
dc.contributor.authorHashimoto, Ken_AU
dc.contributor.authorKon, Sen_AU
dc.contributor.authorNakamura, Nen_AU
dc.contributor.authorGoff, JRen_AU
dc.date.accessioned2020-06-11T04:21:47Zen_AU
dc.date.available2020-06-11T04:21:47Zen_AU
dc.date.issued2013-08-05en_AU
dc.date.statistics2020-05-28en_AU
dc.description.abstractRikuzentakata City, NE Japan, has been repeatedly suffered by tsunami inundations including 1896 Meiji-Sanriku, 1933 Showa-Sanriku, 1960 Chilean Tsunami, and 2011 Tohoku-Oki Tsunami. Up to 30 cm thick sand layer was deposited by the 2011 tsunami in this city (Naruse et al., 2012). Our study indicates that historical and prehistoric tsunamis also left deposits in this area. Nevertheless, previous studies of paleo-tsunami deposits in this area are limited (Haraguchi et al., 2006, Imaizumi et al., 2007), because of the difficulty of finding paleo-tsunami deposits along this ""ria"" coast. We conducted a field survey using a geoslicer to acquire sediment cores in order to explore the magnitude and history of tsunamis in this area. Overall 10 cores, each 2 m long and 12 cm wide were acquired during the survey. The sedimentary sequences were mostly composed of peaty soil, which was thought to have been deposited in a marsh environment, however these soils units were inter-fingered by numerous 1-15 cm thick sand layers. According to initial work including grain size analysis, some of the sand layers deposited 1.4 km from the present shoreline are identified as having a possible tsunami origin because they tend to show upward fining characteristics, indicating rapid sedimentation from suspended load. We will also present the preliminary results of tephra chronology, radiocarbon and 210Pb dating, and diatom analysis.en_AU
dc.description.sponsorshipPossible paleo-tsunami deposits at Rikuzentakata City, Japanen_AU
dc.identifier.citationIijima, Y., Sugawara, D., Gogo, K., Chagué-Goff, C., Hayase, R., Hashimoto, K., Kon, S., Nakamura, N., & Goff, J. (2013). Possible paleo-tsunami deposits at Rikuzentakata City, Japan. Paper presented at the IGU Kyoto Regional Conference 2013, August 4-9, 2013, Kyoto, Japan.en_AU
dc.identifier.conferenceenddate9 August 2013en_AU
dc.identifier.conferencenameIGU Kyoto Regional Conference 2013en_AU
dc.identifier.conferenceplaceKyoto, Japanen_AU
dc.identifier.conferencestartdate4 August 2013en_AU
dc.identifier.govdoc9592en_AU
dc.identifier.urihttp://oguchaylab.csis.u-tokyo.ac.jp/IGU2013/html/igu_2013_program1.htmlen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/9572en_AU
dc.language.isoenen_AU
dc.publisherNational Committee of Japan for IGUen_AU
dc.relation.ispartofseriesPoster Ben_AU
dc.subjectTsunamisen_AU
dc.subjectJapanen_AU
dc.subjectGeologic depositsen_AU
dc.subjectSedimentsen_AU
dc.subjectEarth coreen_AU
dc.subjectShoresen_AU
dc.subjectIsotope datingen_AU
dc.titlePossible paleo-tsunami deposits at Rikuzentakata City, Japanen_AU
dc.typeConference Abstracten_AU
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