Geological record of 18th and 19th century tsunamis along the Japan Sea coast of Tsugaru Peninsula, northwestern Japan
Geological record of 18th and 19th century tsunamis along the Japan Sea coast of Tsugaru Peninsula, northwestern Japan
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日本西北部津轻半岛日本海沿岸 18 世纪和 19 世纪海啸的地质记录
DOI：
10.1016/j.margeo.2022.106905
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发表时间：
2022
期刊：
影响因子：
2.9
通讯作者：
K.
中科院分区：
文献类型：
--
作者：
Okada;R.;Umeda;K.;Kamataki;T.;Sawai;Y.;Matsumoto;D.;Shimada;Y.;and Ioki;K.
我们的地层和古生物学调查揭示了日本西北部本州（日本大陆）日本海沿岸泥炭粘土内的三个沙质沉积物（E1、E2 和 E3）。矿床样品的目视检查和 X 射线计算机断层扫描图像提供了强流的证据，其特征是碎屑撕裂、负载铸造和侵蚀性下地层接触。沉积物中的海洋、咸水和淡水硅藻种类表明它们来自不同的沿海来源。放射性碳测年将事件沉积物 E2 的年龄限制为公元 1764–1902 年，将 E3 限制为公元 1558–1845 年、公元 1699–1918 年和公元 1704–1781 年。根据历史记录，E2沉积物可能对应于1833年庄内大木地震引发的海啸，而E3沉积物对应于与1741年大岛大岛喷发相关的海底滑坡或1793年西津轻地震相关的海啸。由于我们对 1741 年海啸的数值模拟显示研究地点没有明显的淹没，因此 1793 年的地震更有可能是造成海啸沉积物 E3 的原因。 E1 沉积物是不连续的，并且表现出与事件 E2 和 E3 不同的特征（没有荷载结构、撕裂泥屑和混合硅藻组合），因此它不太可能是海啸沉积物。
Our stratigraphic and paleontological investigations revealed three sandy event deposits (E1, E2, and E3) within peaty clay at the Sotomeyachi site on the Japan Sea coast of Honshu (mainland of Japan), northwestern Japan. Visual examination and X-ray computed tomographic images of samples of the deposits provided evidence of strong currents characterized by rip-up mud clasts, load casts, and erosional lower stratigraphic contacts. Marine, brackish, and freshwater diatom species in the deposits indicate they were derived from various coastal sources. Radiocarbon dating constrained the ages of event deposit E2 to 1764–1902 CE and E3 to 1558–1845 CE, 1699–1918 CE, and 1704–1781 CE. According to historical records, the E2 deposits likely correspond to the tsunami generated by the 1833 Shonai-oki earthquake, and the E3 deposits correspond to a tsunami associated with either a submarine landslide associated with the 1741 Oshima-Oshima eruption or the 1793 Nishi-Tsugaru earthquake. Because our numerical simulation of the 1741 tsunami showed no significant inundation at the study site, it is more likely that the 1793 earthquake was responsible for tsunami deposit E3. The E1 deposit is discontinuous and showed different characteristics (absence of load structures, rip-up mud clasts and mixed diatom assemblages) to those of events E2 and E3, so it is unlikely to be a tsunami deposit.