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Volume 55 (2016)
- Issue 6 Pages 253-
- Issue 5 Pages 211-
- Issue 4 Pages 157-
- Issue 3 Pages 71-
- Issue 2 Pages 49-
- Issue 1 Pages 1-
Volume 55, Issue 2
Displaying 1-2 of 2 articles from this issue
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The Paper for the 2014 Japan Association for Quaternary Research Award
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Yoshiki Saito2016 Volume 55 Issue 2 Pages 49-57
Published: April 01, 2016
Released on J-STAGE: April 14, 2016
JOURNAL FREE ACCESSBoth the amount of research and the spread of research disciplines investigating river deltas have increased greatly in recent years. In particular, use of the term “mega-delta” in research papers has become more common since the Fourth Assessment Report of the IPCC was published in 2007. This article provides a brief history of collaborative research and continental shelves and deltas in Asia since the 1990s, most of which has been led by the Geological Survey of Japan, IGCP-475 DeltaMAP and APN mega-delta projects.View full abstractDownload PDF (1219K)
Short Article
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Yuki Sawai, Koichiro Tanigawa, Tetsuya Shinozaki, Toru Tamura, Hiroo N ...2016 Volume 55 Issue 2 Pages 59-66
Published: April 01, 2016
Released on J-STAGE: April 14, 2016
JOURNAL FREE ACCESSWe found a sand layer correlative to the Jogan tsunami in the Kumanosaku archeological site, Miyagi Prefecture, Japan. The sand layer was interbedded with organic mud with lower sharp contact. The basal part of the sand layer was deformed like a series of elliptical balls convexing downward, which may have resulted from sediment loading. A thin mud layer above the deformed sand suggested changes in current velocities during the event. The sand is characterized by a mixture of freshwater and brackish diatom species and by lack of marine planktonic species. Radiocarbon ages suggest that the sand dates to AD 745-930 (2σ), and written records for this period describe an earthquake and tsunami in 869, which is the so-called Jogan event.View full abstractDownload PDF (2896K)
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