The Atlantic coast of Morocco has been exposed to marine submersion events from storm surges and tsunamis which have resulted in human and economic losses. The absence of long term records for these hazards makes it difficult to trace their behavior through time, which is the first step to prepare proactive adaptation strategies for events that may happen in the future. In this paper, we present a late Holocene record of marine submersion events along the Atlantic coast of Morocco using a 2.7 m sediment core sampled from the Tahaddart estuary. The sedimentological and geochemical analyses conducted on this geological archive showed a mud-dominated sequence with 14 allochthonous sandy layers (E1-E14) left by marine high-energy events. The deposition age of three layers (E1, E13 and E14) has been determined using conventional dating methods (210Pbex, 137Cs and 14C). The first layer, introduced as E1 seems to fit with the great Lisbon tsunami in 1755 CE (Common Era), an event dated for the first time along the Atlantic coast of Morocco. The other two layers, referred to as E13 and E14, were dated between 3464 and 2837 cal BP (calibrated years Before Present) and chronologically correlated with marine high-energy deposits found on the Spanish Atlantic coast. This correlation confirms the existence of another regional event around 3200 BP.

中文翻译：

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全新世晚期摩洛哥大西洋沿岸海洋高能事件的记录：塔哈达特河口的新证据

摩洛哥的大西洋沿岸遭受风暴潮和海啸造成的海洋浸没事件，造成人员和经济损失。对于这些危害的长期记录的缺乏使得难以追踪它们的行为，这是为未来可能发生的事件准备主动的适应策略的第一步。在本文中，我们使用从Tahaddart河口采样的2.7 m沉积岩心，介绍了摩洛哥大西洋沿岸海洋沉没事件的全新世记录。在该地质档案上进行的沉积学和地球化学分析显示，海洋高能事件留下的泥浆为主层序，有14个异质砂层（E1-E14）。三层（E1，E13和E14）的沉积年龄已使用常规测年方法（210Pbex，137Cs和14C）。第一层是作为E1引入的，似乎与公元1755年（共同时代）的里斯本海啸相吻合，这是摩洛哥大西洋沿岸第一次发生的事件。另外两层，分别称为E13和E14，其年代为3464至2837 cal BP（经过校准的存在时间），并与西班牙大西洋沿岸发现的海洋高能沉积物按时间顺序相关。这种相关性证实了在3200 BP附近存在另一个区域性事件。年代在3464到2837 cal BP（校准到现在之前）之间，并且与西班牙大西洋沿岸发现的海洋高能沉积物按时间顺序相关。这种相关性证实了在3200 BP附近存在另一个区域性事件。年代在3464到2837 cal BP（校准到现在之前）之间，并且与西班牙大西洋沿岸发现的海洋高能沉积物按时间顺序相关。这种相关性证实了在3200 BP附近存在另一个区域性事件。