Changes in elements and magnetic properties of Sendai Bay sediments caused by the 2011 Tohoku‐oki tsunami
Changes in elements and magnetic properties of Sendai Bay sediments caused by the 2011 Tohoku‐oki tsunami
复制标题
2011年东北冲海啸引起的仙台湾沉积物元素和磁性的变化
作者：
Hirokuni Abe;N. Kawamura;N. Ishikawa;T. Kogiso
沿着岛弧沉积的近岸海洋沉积物可以保存过去灾难事件（例如海啸）的证据。 2011 年 3 月 11 日日本东北太平洋沿岸发生海啸的证据很可能保存在海洋沉积物中。本研究旨在利用地球化学和岩石磁力分析来调查仙台湾海洋沉积物中保存的海啸记录，仙台湾位于 2011 年东北地震震中以西。我们从 2002 年到 2014 年在仙台湾的五个站（S-1、S-2、S-3、S-4 和 S-5）收集了沉积物样本。我们比较了海啸前后收集的样本。我们确定，在 2011 年沉积物样本中，S-3、S-4 和 S-5 站的淤泥成分增加，而细砂成分减少。值得注意的是，海啸后陆地和工业金属元素（铜、锌和铅）的浓度以及总氮、碳和硫的含量增加，而磁化率和等温剩磁值下降。我们还发现 2011 年样品中贫钛磁铁矿有所增加，表明海啸引起的变化。海啸 6 个月后，研究地区经历了一场大型台风，导致洪水泛滥。 2012年样品中总有机碳和总氮比率的升高表明陆地有机质是由洪水供给的。
Nearshore marine sediments deposited along island arcs can preserve evidence of past disaster events, such as tsunamis. Evidence of a tsunami that occurred off the Pacific coast of Tohoku, Japan, on March 11, 2011, was likely preserved in marine sediments. Using geochemical and rock magnetic analyses, this study aimed to investigate tsunami records preserved in marine sediments in Sendai Bay, located west of the epicenter of the 2011 Tohoku earthquake. We collected sediment samples at five stations (S‐1, S‐2, S‐3, S‐4, and S‐5) in Sendai Bay from 2002 to 2014. We compared the samples collected before and after the tsunami. We established that the silt component increased, while that of fine sand decreased at stations S‐3, S‐4, and S‐5 in the 2011 sediment sample. Notably, the concentrations of terrestrial and industrial metallic elements (Cu, Zn, and Pb) and total nitrogen, carbon, and sulfur amounts increased, while the magnetic susceptibility and isothermal remanent magnetization values decreased after the tsunami. We also found that Ti‐poor magnetite increased in the 2011 samples, indicating tsunami‐mediated changes. The study area experienced a large typhoon 6 months after the tsunami, leading to flooding. The elevation in the total organic carbon and total nitrogen ratio in the 2012 sample suggested that terrestrial organic matter was supplied by the flood.
泰国安达曼海大陆架上保存的事件层的内部结构：海啸与风暴和山洪沉积物
影响因子：
4.6
作者：
Sakuna-Schwartz;Feldens;Schwarzer;Khokiattiwong;Stattegger
通讯作者：
Stattegger
影响因子：
3
作者：
Feldens, P.;Schwarzer, K.;Sompongchaiyakul, P.
通讯作者：
Sompongchaiyakul, P.