Tsunami sediments

海啸沉积物

• 批准号: 23540498
• 负责人: ANDO Masataka
• 金额: $ 3.24万
• 依托单位: University of the Ryukyus
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23540498/
• 关键词: 津波; 琉球海溝; 沈み込み帯; 1771年八重山津波; 石垣島; 津波堆積物; 有孔虫; 年代測定; 海溝系地震; C１４年代測定; カップリング率; 掘削調査; 1771年津波; C14年代測定; 石垣宮古島; 明和の津波; 津波石; ジオスライサー; 津波発生間隔

Some subduction zones are associated with large earthquakes but others are not or infrequent The Ryukyu subduction zone is grouped into the extensional group, having the fastest convergence rate (12.5cm/y). In this subduction zone, we obtained a complete set of tsunami layers which were found to be buried in a gentle slope hill. The most recent event corresponds to the 1771 documented in several records. The height documented is 20 m while the highest tsunami layer reaches to 8 m, which are very consistent with historical documents since tsunami sediments below the run-up heights of sea water. The 1771 event was estimated to have occurred near the trench with a fault slip of 20 m. This slip can be accumulated in 160 years if 100% of its relative plate motion is accumulated. However, the intervals we found are 500 and possibly 100 years, significantly longer that this slip. This suggests that the extensional subduction zone has an ineffective accumulation of slip on its interface.

有些俯冲带与大地震有关，有些则不与大地震有关。琉球俯冲带属于伸展俯冲带，其收敛速度最快（12.5cm/y）。在这条俯冲带中，我们获得了一套完整的海啸层，这些海啸层被发现埋在一个缓坡丘陵中。最近的事件对应于1771年在几个记录中记载的事件。记录的海啸高度为20 m，最高海啸层达到8 m，这与历史文献非常一致，因为海啸沉积物低于海水的上升高度。据估计，1771年事件发生在海沟附近，断层滑动20米。如果100%的板块相对运动被累积起来，这种滑动可以在160年内累积起来。然而，我们发现的间隔是500年，可能是100年，比这次滑动要长得多。这表明伸展俯冲带在其界面上存在滑动的无效积累。

项目成果

Tsunami recurrence from Holocene deposits on Ishigaki island along the Ryukyu suduction zone

石垣岛琉球俯冲带全新世沉积物再次引发海啸

• 发表时间: 2012
• 作者: Masataka Ando;Masanobu Shishikura;Yoko Tu and Mamoru Nakamura
• 通讯作者: Yoko Tu and Mamoru Nakamura

Aspire Resort

渴望度假村

• 发表时间: 2013
• 作者: Ando;M. and T. Yoko
• 通讯作者: M. and T. Yoko

A possible tsunamTsunami folklore and potential tsunami risk on the eastern coast of Taiwani source based on tsunami folklore and interview with local residents on the eastern coast of Taiwan

台湾东海岸可能发生的海啸民间传说及潜在海啸风险来源基于海啸民间传说及台湾东海岸当地居民访谈

• 发表时间: 2013
• 作者: Masataka Ando;Mamoru Nakamura and Cheng-Horng Lin
• 通讯作者: Mamoru Nakamura and Cheng-Horng Lin

Large earthquakes and tsunamis along the Ryukyu trench

琉球海沟沿岸发生大地震和海啸

• 发表时间: 2013
• 作者: Ando;M. and T. Yoko;Tu Yoko and Msataka Ando;Masataka Ando and Yoko Tu
• 通讯作者: Masataka Ando and Yoko Tu

Tsunami recurrence inferred from soil deposits on Ishigaki island along the Ryukyu

根据琉球沿岸石垣岛的土壤沉积推断海啸复发

• 发表时间: 2012
• 作者: Masataka Ando;Masanobu Shishikura;Yoko Tu and Mamoru Nakamura
• 通讯作者: Yoko Tu and Mamoru Nakamura