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首页> 外文期刊>Pure and Applied Geophysics >Source Fault Model of the 1771 Yaeyama Tsunami, Southern Ryukyu Islands, Japan, Inferred from Numerical Simulation
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Source Fault Model of the 1771 Yaeyama Tsunami, Southern Ryukyu Islands, Japan, Inferred from Numerical Simulation

机译：从数值模拟推论日本南部琉球群岛1771年八重山海啸的源断层模型

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摘要

The 1771 Yaeyama tsunami is successfully reproduced using a simple faulting model without submarine landslide. The Yaeyama tsunami (M 7.4), which struck the southern Ryukyu Islands of Japan, produced unusually high tsunami amplitudes on the southeastern coast of Ishigaki Island and caused significant damage, including 12,000 casualties. Previous tsunami source models for this event have included both seismological faults and submarine landslides. However, no evidence of landslides in the source has been obtained, despite marine surveying of the area. The seismological fault model proposed in this study, describing a fault to the east of Ishigaki Island, successfully reproduces the distribution of tsunami runup on the southern coast of the Ryukyu Islands. The unusual runup heights are found through the numerical simulation attributable to a concentration of tsunami energy toward the southeastern coast of Ishigaki Island by the effect of the shelf to the east. Thus, the unusual runup heights observed on the southeastern coast of Ishigaki Island can be adequately explained by a seismological fault model with wave-ray bending on the adjacent shelf.
机译：使用简单的断层模型成功复制了1771年的八重山海啸，没有海底滑坡。袭击日本南部琉球群岛的八重山海啸（M 7.4）在石垣岛东南沿海产生异常高的海啸振幅，并造成重大损失，包括12,000人伤亡。该事件以前的海啸源模型包括地震断层和海底滑坡。然而，尽管对该区域进行了海洋调查，但仍未获得源头发生滑坡的证据。本研究提出的地震断层模型描述了石垣岛以东的断层，成功地再现了琉球群岛南部沿海海啸上升的分布。通过数值模拟发现了异常的上升高度，这是由于海架能量向东扩展，这是由于海架能量向石垣岛东南海岸集中。因此，在石垣岛东南沿海观察到的异常上升高度可以通过地震断层模型充分解释，该模型在相邻的架子上具有波射线弯曲。

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