Block and boulder accumulations along the coastline between Fins and Sur (Sultanate of Oman): tsunamigenic remains?
Block and boulder accumulations along the coastline between Fins and Sur (Sultanate of Oman): tsunamigenic remains?
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DOI：
10.1007/s11069-012-0399-7
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发表时间：
2013-01-01
期刊：
影响因子：
3.7
通讯作者：
Rausch, T.
中科院分区：
文献类型：
--
作者：
Hoffmann, G.;Reicherter, K.;Rausch, T.
阿曼苏丹国在芬斯和苏尔之间的岩石海岸线上有许多大块巨石和巨石堆积，形成了壁垒。这些岩石块以重达40吨的岩石、叠瓦状的岩石和“巨石链”的形式出现。“向陆地，沉积物变成砂/巨石混合物，远端变成砂。海岸由第三系褶皱灰岩和第四纪海滩岩组成，两者也构成了巨碎屑岩。从平均海平面以上6-10 m的断裂向海平台的运输距离在20 m和50 m以上之间变化。我们发现了最近的珊瑚和倾倒的块与附着牡蛎和岩石池。地面激光扫描被用来分析地貌特征以及块重量的体积估计。2007年的古努或2010年的费特等热带气旋过去曾影响过阿曼的海岸线。在最近的气旋海岸变化很小，因此，我们解释为海啸的块沉积。然而，这种解释并不明确。海啸最有可能的发源地是位于北方印度洋的马克兰俯冲带。在这里，至少有4-5次海啸地震被记录在案。
The rocky coastline of the Sultanate of Oman between Fins and Sur is decorated by a number of large blocks and boulder accumulations forming ramparts. The blocks occur as individual rocks of up to 40 tons, as imbricated sets and as "boulder trains." Landward, the deposits change into a sand/boulder mixture and distal into sands. The coast is made up of Tertiary folded limestones and beach rock of Quaternary age, both also constitute the megaclasts. The transport distance from the fractured seaward platform of 6-10 m above mean sea level varies between 20 m and more than 50 m. We found individual blocks of recent corals and overturned blocks with attached oysters and rock pools. Terrestrial laser scanning was used to analyze geomorphologic features as well as for volumetric estimates of the block weights. Tropical cyclones such as Gonu in 2007 or Phet in 2010 are known to have affected Oman's coastline in the past. The coastal changes during recent cyclones were minor; therefore, we interpret the block deposits as tsunamigenic. However, this interpretation is not unambiguous. The most likely source area for a tsunami is seen in the Makran Subduction Zone situated in the northern Indian Ocean. Here, at least 4-5 tsunamigenic earthquakes are documented.