Large Holocene tsunamis in the northern Arabian Sea
Large Holocene tsunamis in the northern Arabian Sea
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阿拉伯海北部全新世大型海啸
DOI：
10.1016/j.margeo.2019.106068
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发表时间：
--
期刊：
影响因子：
2.9
通讯作者：
Reicherter
中科院分区：
文献类型：
--
作者：
Hoffmann;Grützner;Schneider;Preusser;Reicherter
海啸在历史上曾多次袭击阿曼（北阿拉伯海）海岸（例如 1945 年、2013 年）。这些事件的波高较小（< 3 m）且淹没距离较短，但尚不清楚更强的事件是否会影响该地区。阿曼北海岸描述了巨石沉积物和细粒沉积物，这些沉积物被解释为更大规模的史前海啸事件的证据。没有系统的年代测定，这妨碍了解释。在本文中，我们报告了这些沉积物中海洋生物的放射性碳测年结果，并介绍了细粒度单元的发光测年结果。我们记录了过去海啸的新沉积学和考古学证据，并描述了有关 1945 年阿曼莫克兰海啸影响的新数据。由于阿曼海岸容易发生热带风暴，我们讨论了气旋造成沉积物输送的可能性，并将我们的发现与全球风暴造成巨石输送的最新证据进行了比较。我们认为，我们的结果支持基于沉积学、考古学和空间标准的海啸解释。测年结果表明，大约 1000 年前海啸袭击了阿曼北部海岸。与历史海啸影响的比较表明，这次古事件的规模超过了研究区域的所有现代例子。我们推测，只有莫克兰俯冲带发生大地震才能产生如此规模的海啸。在这种情况下，地震可能至少使莫克兰西部部分破裂，这意味着莫克兰西部尚未完全解锁。基于历史数据的灾害情景低估了北阿拉伯海的海啸威胁。
Tsunamis have repeatedly hit the shores of Oman (Northern Arabian Sea) in historical times (e.g. 1945, 2013). These events had small (< 3 m) wave heights and short inundation distances, but it is unclear if much stronger events can affect the area. Boulder deposits and fine-grained sediments are described from the north coast of Oman, which are interpreted as evidence for much larger pre-historic tsunami events. No systematic dating was available, which hampers interpretation. In this paper we report radiocarbon dating results for marine organisms in these deposits and present luminescence dating of fine-grained units. We document new sedimentological and archaeological evidence for past tsunamis and describe new data on the impact of the 1945 Makran tsunami in Oman. Since the coast of Oman is prone to tropical storms, we discuss the possibility of sediment transport by cyclones and we compare our findings with recent evidence of boulder transport by storms worldwide. We argue that our results favor an interpretation as tsunamites based on sedimentological, archaeological, and spatial criteria. The dating results allow us to show that a tsunami hit the northern coast of Oman around 1000 years ago. A comparison with historical tsunami impact indicates that this palaeo-event exceeded in size all modern examples in the study area. We speculate that only a large earthquake at the Makran Subduction Zone can produce a tsunami of this size. In that case, the earthquake might have at least partially ruptured the western Makran, which would imply that the western Makran is not completely unlocked. Hazard scenarios based on historical data underestimate the tsunami threat in the Northern Arabian Sea.
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DOI：
--
发表时间：
2008
期刊：
影响因子：
--
作者：
M. Heidarzadeh;M. D. Pirooz;N. H. Zaker;A. Yalciner;M. Mokhtari;A. Esmaeily
通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
2.8
作者：
G. Grando;K. McClay
通讯作者：
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