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Article: Event deposits associated with tsunamis and their sedimentary structure in Holocene marsh deposits on the east coast of the Shima Peninsula, central Japan

TitleEvent deposits associated with tsunamis and their sedimentary structure in Holocene marsh deposits on the east coast of the Shima Peninsula, central Japan
Authors
KeywordsHolocene
Kii Peninsula
Tokai and Tonankai earthquake
Tsunami deposits
Issue Date2005
PublisherOsaka City University, Department of Geosciences
Citation
Journal Of Geosciences, 2005 n. 48, p. 143-158 How to Cite?
AbstractIn Japan, many earthquakes have occurred during historic times. Many tsunamis caused by these earthquakes are recorded in ancient documents. Some researchers have studied tsunami deposits in lake and marsh sediments in coastal areas of Japan. However there are only very few st udies on tsunami deposits at the Kii Peninsula. The coastal area of this peninsula faces the Nankai Trough. Tsunamis triggered by great Tokai and/or Tonankai Earthquakes (M ≥ 8), whose source is distributed along the Nankai Trough, have been causing serious damage to this area. We examined some cores related to some eve nt deposits (sand layers) possibly caused by the Tokai and/or Tonankai Earthquakes. Studied cores (A0-6, B1, P1-2) were excavated at the coastal marsh in the east side of the Kii Peninsula. In this marsh deposits, some researchers reported diatom, foraminifera, radiocarbon age and general lithofacies. We summarized these previous studies and carried out detailed lithofacies descriptions and additional radiocarbon dating to elucidate paleoenvironments of the studied area and origin of sand layers. Tempor al changes of Holocene depositional environments of the studied area were elucidated as follow: Around 7,000 cal yr BP, marine (inner bay) environment; ca. 6,500-3,000 cal yr BP, freshwater marsh; ca. 3,000-1,000 cal yr BP, influence of marine water to the marsh; after ca. 1,000 cal yr BP, fresh-water marsh; the Edo Period- the beginning of the Showa Period, the paddy cultivation in studied marsh; After the beginning of the Showa Period, fresh-water marsh (stopping of the paddy cultivation). Lithofacies and distribution of event deposits strongly s uggested that sand layers were formed by tsunamis.
Persistent Identifierhttp://hdl.handle.net/10722/132800
ISSN
2015 SCImago Journal Rankings: 0.392
References

 

DC FieldValueLanguage
dc.contributor.authorOkahashi, Hen_HK
dc.contributor.authorTasuhara, Men_HK
dc.contributor.authorMitamura, Men_HK
dc.contributor.authorHirose, Ken_HK
dc.contributor.authorYoshikawa, Sen_HK
dc.date.accessioned2011-03-28T09:29:10Z-
dc.date.available2011-03-28T09:29:10Z-
dc.date.issued2005en_HK
dc.identifier.citationJournal Of Geosciences, 2005 n. 48, p. 143-158en_HK
dc.identifier.issn0449-2560en_HK
dc.identifier.urihttp://hdl.handle.net/10722/132800-
dc.description.abstractIn Japan, many earthquakes have occurred during historic times. Many tsunamis caused by these earthquakes are recorded in ancient documents. Some researchers have studied tsunami deposits in lake and marsh sediments in coastal areas of Japan. However there are only very few st udies on tsunami deposits at the Kii Peninsula. The coastal area of this peninsula faces the Nankai Trough. Tsunamis triggered by great Tokai and/or Tonankai Earthquakes (M ≥ 8), whose source is distributed along the Nankai Trough, have been causing serious damage to this area. We examined some cores related to some eve nt deposits (sand layers) possibly caused by the Tokai and/or Tonankai Earthquakes. Studied cores (A0-6, B1, P1-2) were excavated at the coastal marsh in the east side of the Kii Peninsula. In this marsh deposits, some researchers reported diatom, foraminifera, radiocarbon age and general lithofacies. We summarized these previous studies and carried out detailed lithofacies descriptions and additional radiocarbon dating to elucidate paleoenvironments of the studied area and origin of sand layers. Tempor al changes of Holocene depositional environments of the studied area were elucidated as follow: Around 7,000 cal yr BP, marine (inner bay) environment; ca. 6,500-3,000 cal yr BP, freshwater marsh; ca. 3,000-1,000 cal yr BP, influence of marine water to the marsh; after ca. 1,000 cal yr BP, fresh-water marsh; the Edo Period- the beginning of the Showa Period, the paddy cultivation in studied marsh; After the beginning of the Showa Period, fresh-water marsh (stopping of the paddy cultivation). Lithofacies and distribution of event deposits strongly s uggested that sand layers were formed by tsunamis.en_HK
dc.languageengen_US
dc.publisherOsaka City University, Department of Geosciencesen_US
dc.relation.ispartofJournal of Geosciencesen_HK
dc.subjectHoloceneen_HK
dc.subjectKii Peninsulaen_HK
dc.subjectTokai and Tonankai earthquakeen_HK
dc.subjectTsunami depositsen_HK
dc.titleEvent deposits associated with tsunamis and their sedimentary structure in Holocene marsh deposits on the east coast of the Shima Peninsula, central Japanen_HK
dc.typeArticleen_HK
dc.identifier.emailTasuhara, M: yasuhara@hku.hken_HK
dc.identifier.authorityTasuhara, M=rp01474en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.scopuseid_2-s2.0-22944459529en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-22944459529&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.issue48en_HK
dc.identifier.spage143en_HK
dc.identifier.epage158en_HK
dc.publisher.placeJapanen_HK
dc.identifier.scopusauthoridOkahashi, H=23971420100en_HK
dc.identifier.scopusauthoridTasuhara, M=7102069020en_HK
dc.identifier.scopusauthoridMitamura, M=6603558821en_HK
dc.identifier.scopusauthoridHirose, K=8656424700en_HK
dc.identifier.scopusauthoridYoshikawa, S=7202952155en_HK

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