Relationship between the maximum extent of tsunami sand and the inundation limit of the 2011 Tohoku-oki tsunami on the Sendai Plain, Japan
Relationship between the maximum extent of tsunami sand and the inundation limit of the 2011 Tohoku-oki tsunami on the Sendai Plain, Japan
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DOI：
10.1016/j.sedgeo.2012.05.004
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发表时间：
2012-12-30
影响因子：
2.8
通讯作者：
Sugawara, Daisuke
中科院分区：
文献类型：
--
作者：
Abe, Tomoya;Goto, Kazuhisa;Sugawara, Daisuke
本文主要研究了2011年东北大海啸的最大沙质海啸沉积范围与淹没距离的关系。在仙台沿海平原的7个海岸正常横断面上评估了东北海啸的淹没极限。被淹没的距离由0.6至4.0公里不等。在海啸沉积的最大范围内，砂单元的厚度从0.1到4.0厘米不等。在淹没距离小于2.5 km的地区，cm厚沙层的最大极限扩展到淹没距离的90%以上。这一观察结果与先前的研究相一致，这些研究检查了最近淹没距离至少为2公里的海啸事件的特征。cm厚沙层的最大极限扩展到3 km（占淹没距离的57 ~ 76%），淹没距离大于2.5 km。我们的研究结果对于根据沉积物向陆地的范围估计古海啸淹没距离具有重要意义，对于评估世界上其他沿海地区未来的海啸风险具有重要价值，这些地区过去曾遭受过巨大海啸的破坏。(c) 2012 Elsevier B.V.版权所有
This paper focuses on the relationship between the maximum extent of sandy tsunami deposits and inundation distance of the 2011 Tohoku-oki tsunami. Inundation limits of the Tohoku-oki tsunami were assessed over seven shore-normal transects along the Sendai Coastal Plain. Inundation distances were found to range from 0.6 to 4.0 km. At the maximum extent of the tsunami deposit, the sand unit ranged in thicknesses from 0.1 to 4.0 cm. The maximum limit of the cm thick sand layer extended to over 90% of the inundation distance where the inundation distance was less than 2.5 km. This observation is consistent with previous studies that examined characteristics of recent tsunami events that had inundation distances of at least 2 km. The maximum limit of the cm thick sand layer extended to 3 km (57-76% of the inundation distance) where the inundation distance was more than 2.5 km. Our results are important for estimating paleo-tsunami inundation distances based on the landward extent of sand deposits and valuable for the assessment of future tsunami risks in other coastal areas in the world, which have been devastated by huge tsunamis in the past. (c) 2012 Elsevier B.V. All rights reserved.