Ground penetrating radar facies of inferred tsunami deposits on the shores of the Arabian Sea (Northern Indian Ocean)

Ground penetrating radar facies of inferred tsunami deposits on the shores of the Arabian Sea (Northern Indian Ocean)
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推断阿拉伯海(北印度洋)沿岸海啸沉积物的探地雷达相

DOI:
10.1016/j.margeo.2014.03.002
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发表时间:
--
期刊:
影响因子:
2.9
通讯作者:
Reicherter
Reicherter
中科院分区:
地球科学2区
文献类型:
--
作者:
Koster;Hoffmann;Grützner;Reicherter

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历史报告和沉积学调查已经证明,阿拉伯海沿岸,包括阿曼湾海岸,曾发生过海啸。不应低估这种广泛事件在该区域的破坏性影响。在我们的研究中,我们提出了一个调查的粗到细粒度,海洋海啸沉积物在附近的鳍,阿曼苏丹国,使用探地雷达(GPR)。沿海滩剖面的沉积环境沿着保留了可能的高能波浪影响的证据(巨石和块沉积物以及挖沟结果)。研究区域的环境是导致最佳GPR数据质量的条件的代表:干旱条件,没有电力线路的干扰,以及升高的研究区域(~5-10 m a.m.s.l.)消除了探地雷达数据中的低频噪声和盐水的可能性。四个研究区域的探地雷达结果的三维可视化显示,例如,沉积物的楔入和内陆特征的细化,以及存款底部的几个侵蚀特征。这些发现证实了推断海啸沉积物的假设。此外,所提出的探地雷达调查技术提供了新的见解的空间分布和内部架构的(古)海啸存款在可比的全球海啸易发地区。
The occurrence of tsunami waves that affected the shores of the Arabian Sea including the Gulf of Oman coastline has been proven by historical reports and sedimentological investigations. The damaging effect of such extensive events should not be underestimated in this region. In our study we present an investigation of coarse- to fine-grained, marine tsunami deposits in the vicinity of Fins, Sultanate of Oman, using ground penetrating radar (GPR). The sedimentary setting along the beach section preserves evidence (boulder & block deposits as well as trenching results) for possible high-energy wave impacts. The investigated area's environment is representative of conditions which lead to the best possible GPR data quality: arid conditions, no interference due to electrical power lines, and an elevated study area (~5–10 m a.m.s.l.) which eliminates the low-frequency noise of the ground and the possibility of salt water in the GPR data. 3D visualisation of GPR results from four study areas show e.g. wedging out of sediments and fining inland features, as well as several erosion features at the base of the deposit. These findings corroborate the hypothesis of inferred tsunami deposits. Furthermore, the presented GPR investigation technique provides new insights regarding the spatial distribution and internal architecture of (palaeo-) tsunami deposits in comparable tsunami prone regions worldwide.
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