Source Fault Model of the 1771 Yaeyama Tsunami, Southern Ryukyu Islands, Japan, Inferred from Numerical Simulation
Source Fault Model of the 1771 Yaeyama Tsunami, Southern Ryukyu Islands, Japan, Inferred from Numerical Simulation
复制标题
通过数值模拟推断的 1771 年日本琉球群岛南部八重山海啸的震源断层模型
DOI：
10.1007/s00024-005-0007-9
复制
发表时间：
2006
影响因子：
2
通讯作者：
M. Nakamura
中科院分区：
文献类型：
--
作者：
M. Nakamura
1771年八重山海啸成功地再现使用一个简单的断层模型没有海底滑坡。八重山海啸（M7.4）袭击了日本琉球群岛南部，在石垣岛东南海岸产生了异常高的海啸振幅，并造成了重大破坏，包括12，000人伤亡。以前的海啸源模型包括地震断层和海底滑坡。然而，尽管对该地区进行了海洋调查，但没有获得源头发生山体滑坡的证据。本研究中提出的地震断层模型，描述了一个断层的石垣岛以东，成功地再现了海啸的分布在琉球群岛南部海岸。通过数值模拟发现，异常的爬高高度归因于海啸能量集中在石垣岛的东南海岸的影响，大陆架的东部。因此，在石垣岛东南海岸观测到的异常上升高度可以用地震断层模型与相邻大陆架上的波射线弯曲来充分解释。
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.