Tracing woody-organic tsunami deposits of the 2011 Tohoku-oki event in Misawa (Japan).

Tracing woody-organic tsunami deposits of the 2011 Tohoku-oki event in Misawa (Japan).
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DOI:
10.1038/s41598-021-88199-3
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发表时间:
2021-04-26
期刊:
影响因子:
4.6
通讯作者:
Reicherter K
Reicherter K
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bellanova P;Frenken M;Nishimura Y;Schwarzbauer J;Reicherter K

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据报道,2011年发生在东北的海啸至少掀起了三次巨浪,其破坏力给日本北部青森海岸造成了巨大破坏。在三泽,沿海控制区被淹没至内陆550米,沙质沉积物残留物可追溯到距海岸线350米(最大淹没量的61-63%)。将木质和有机层中可漂浮塑料物体的发现与我们的分析数据联系起来,发现了一种尚未记录的木质-有机海啸沉积物,它首先出现在沉积物的顶部,然后到达更远的内陆。69% - 72%的最大值。洪水)。通过这一观察,我们对海啸淹没的记录部分的理解可能会有所改善。因此,历史和古海啸的沙层代表了对沿海淹没的最低估计,通过解决海啸淹没的木质和有机部分,可以减少低估。
With a minimum of three reported waves, the 2011 Tohoku-oki tsunami’s destructive force caused massive damage along the northern Japanese Aomori coast. At Misawa the coastal control area was inundated up to 550 m inland and sandy sediment remnants can be traced to c. 350 m (c. 61–63% of the maximum inundation) from the shoreline. Linking the discovery of floatable plastic objects within a woody and organic layer to our analytical data lead to the detection of a yet undocumented woody-organic tsunami deposit first appearing on top of the sandy deposit but then reaching even further inland (approx. 69–72% of the max. inundation). By this observation our understanding of the documented part of the tsunami inundation may be improved. As a consequence, sand sheets of historic and paleo-tsunamis represent minimum estimates for the coastal inundation and underestimation may be reduced by addressing the woody and organic fraction of a tsunami’s inundation.
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