Abstract The Lesser Antilles are a densely populated region where local populations and industrial facilities are concentrated at the coastlines, and are therefore exposed to many rapid-onset hazards such as hurricanes and tsunamis. However, the historical catalog of these events is too short to allow risk assessment and return period estimations, and it needs to be completed with long-term records of washover deposits in coastal sedimentary environments such as lagoons. In this study, two sediment cores were taken in March 2018 in a small coastal lagoon on Scrub Island (northeastern Caribbean). Sedimentological, geochemical, microfaunal and chronological analyses enabled us to identify 25 sandy layers resulting from high-energy-marine floods. Two of these layers were interpreted as tsunami deposits based on sedimentological (rip-up clast of the underlying cohesive substrate and internal mud laminae), and geochemical evidence. The most recent deposit is associated with the transatlantic tsunami triggered by the 1755 CE Lisbon earthquake. The older one is the thickest sandy layer recorded in the lagoon, with an age range of 1364-1469 cal. CE, as determined using 14C dating. This event was recorded in sedimentary archives of both the northern and the southern part of the Caribbean, with its large spatial extent, supporting a distant tsunamigenic origin. The 23 remaining sandy layers were interpreted as storm deposits, based on sedimentological and chronological data, with the three most recent layers being correlated with historical hurricanes. This new 1600 year-long record displays similarities with that of the Bahamas, with the periods of intense hurricane activity being in antiphase with those of the north-eastern US coast. This regional comparison may provide evidence for a latitudinal forcing of hurricane tracks through time in relation to climate fluctuations.

中文翻译：

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小安的列斯群岛（安圭拉磨砂岛）长达 1600 年的海啸和飓风沉积记录

摘要 小安的列斯群岛是一个人口稠密的地区，当地人口和工业设施集中在海岸线，因此容易受到飓风和海啸等许多快速发生的灾害的影响。然而，这些事件的历史目录太短，无法进行风险评估和重现期估计，需要通过泻湖等沿海沉积环境中冲刷沉积的长期记录来完成。在这项研究中，2018 年 3 月在 Scrub 岛（加勒比东北部）的一个小型沿海泻湖中采集了两个沉积物岩心。沉积学、地球化学、微动物群和年代学分析使我们能够确定由高能量海洋洪水造成的 25 个沙层。其中两个层被解释为基于沉积学（下伏粘性基质和内部泥层的破裂碎屑）和地球化学证据的海啸沉积物。最近的矿床与公元 1755 年里斯本地震引发的跨大西洋海啸有关。较老的一层是泻湖中记录的最厚的沙层，年龄范围为 1364-1469 卡路里。CE，使用 14C 测年确定。该事件记录在加勒比海北部和南部的沉积档案中，其空间范围大，支持遥远的海啸起源。根据沉积学和年代学数据，剩余的 23 个沙层被解释为风暴沉积物，最近的三个层与历史飓风相关。这一长达 1600 年的新记录显示出与巴哈马的相似之处，强烈飓风活动的时期与美国东北部海岸的飓风活动时期相反。这种区域比较可能为飓风轨迹随时间的纬度强迫与气候波动相关提供证据。