Historic 1771 Meiwa tsunami confirmed by high‐resolution U/Th dating of massive Porites coral boulders at Ishigaki Island in the Ryukyus, Japan
Historic 1771 Meiwa tsunami confirmed by high‐resolution U/Th dating of massive Porites coral boulders at Ishigaki Island in the Ryukyus, Japan
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DOI：
10.1029/2009gc002893
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发表时间：
2010-06
期刊：
影响因子：
3.7
通讯作者：
D. Araoka;M. Inoue;A. Suzuki;Y. Yokoyama;R. Edwards;Hai Cheng;H. Matsuzaki;H. Kan;N. Shikazono;H. Kawahata
中科院分区：
文献类型：
--
作者：
D. Araoka;M. Inoue;A. Suzuki;Y. Yokoyama;R. Edwards;Hai Cheng;H. Matsuzaki;H. Kan;N. Shikazono;H. Kawahata
根据琉球王国的编年史记载，在17至19世纪期间，石垣岛至少发生了四次沿海洪水事件：1771年的地震海啸，造成12，000人死亡;另一次地震海啸（1687年）;以及两次未记录原因的事件（1625年和1714年）。我们使用高分辨率U/Th方法来测定保存完好的大型滨珊瑚表面部分。他们对被抛上岸的珊瑚头巨石进行了研究，发现两块巨石的年龄与1771年的事件相对应。一个大的滨珊瑚巨石（直径> 4米）的日期为1625年，这表明该事件也是一个大的洪水事件。校准的14 C年龄，根据放射性碳海洋水库效应的新估计的本地值，聚集在1625年和1771年左右，这表明这些事件比其他事件更大。我们的研究表明，滨珊瑚巨石具有巨大的潜在价值的古洪水事件，如海啸和极端风暴的研究。
The chronicles of the Ryukyu Kingdom describe at least four coastal inundation events at Ishigaki Island during the seventeenth through nineteenth centuries: the 1771 Meiwa earthquake tsunami, which killed 12,000 people; another earthquake tsunami (1687); and two events with unrecorded causes (1625 and 1714). We used a high‐resolution U/Th method to date well‐preserved surface parts of massive Porites spp. coral head boulders that had been cast ashore and found that the ages of two boulders correspond to the 1771 event. One large Porites boulder (diameter > 4 m) was dated to 1625, suggesting that that event was also a large inundation event. Calibrated 14C ages, based on a newly estimated local value for the radiocarbon marine reservoir effect, clustered around 1625 and 1771, suggesting that these events were larger than the others. Our study demonstrated that Porites boulders have enormous potential value for studies of paleoinundation events such as tsunamis and extreme storms.