Journal
JOURNAL OF QUATERNARY SCIENCE
Volume 30, Issue 4, Pages 293-297Publisher
WILEY
DOI: 10.1002/jqs.2786
Keywords
Cs-134; grain size; sediment transport; shelf; tsunami
Funding
- grant for 'Research and Investigation on Multiple Geological Hazards Caused by Huge Earthquakes'
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Little is known about offshore tsunami deposits, although they have the potential to improve palaeotsunami reconstructions, especially in areas with limited preservation of onshore tsunami deposits. We analysed 44 sediment cores collected in 2012 at water depths of 14-30 m in Sendai Bay, north-eastern Japan, to identify the deposits of the 2011 Tohoku-oki tsunami with the aid of Cs-134 released from the Fukushima-Daiichi Nuclear Plant. The preserved tsunami deposits in the inner shelf are interbedded with very fine sand and mud, showing similar features to storm deposits. In the shoreface, a distinct layer of coarse sand overlies fine sand, appearing to have originated as beach sand transported offshore by the tsunami backwash. The coarse sand fades offshore around the boundary between the shoreface and inner shelf. Many of the core sites show evidence that surface sediment was reworked, probably by post-tsunami storm waves, suggesting that further reworking would make the ultimate preservation of the tsunami deposits unlikely. Copyright (C) 2015 John Wiley & Sons, Ltd.
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