第四紀時期，台灣東海岸多次發生強烈的海浪。其中一個強烈的海浪大水事件是在公元1771年襲擊了阿美族的定居點。關於這個事件有兩種不同的假設。第一個假設此悲劇是海嘯，第二個假設認為它是由風暴引起的。因此，本研究的目的是調查台灣東部沿海地區豐濱至第四紀都蘭的強海浪事件。本研究試圖從豐濱，長濱和都蘭三個地點的海洋露頭收集固結和還未固結的沉積物。通過數點計數法和生物分析法對其進行評價，以獲得岩相，物源和沈積物運移機制。現場觀察顯示，海洋階地頂部以異常順序存在珊瑚碎片，海洋和陸地貝殼。異常序列的其他特徵是15-20厘米厚，向上澄清，主要是中到粗砂，中度分選到非常差的分類，包含大量浮游和底棲有孔蟲，以及裂縫碎屑的存在。有孔蟲組合的年齡描繪了更新世 - 全新世。此外，有孔蟲組合的古水深測量主要來自中間的Neritic（海平面以下30-100米）。異常層序與日本石垣島和宮古群島2000年的海嘯層序有關。這些事件可能歸因於琉球海溝的構造活動。這項研究的結論是，海嘯事件確實發生在第四紀的台灣東海岸。;Strong sea waves had occurred on the eastern coast of Taiwan for many times in the Quaternary Period. One of the greatest events was a strong sea wave that struck Ami′s settlement in 1771 AD. There are two different hypothesis about this event. The first hypothesis held that the tragedy was a tsunami, on the other hand, the second hypothesis argued that it had been caused by a large storm. Therefore, the aim of this research was to investigate the strong sea wave events on the eastern coast of Taiwan along Fengbin to Tulan in the Quaternary Period. This study tried to collect consolidated and unconsolidated sediments from the marine terrace in three locations, which are Fengbin, Changbin, and Tulan. They were evaluated by using point counting method and biozonation analysis to obtain the rock facies, provenance, and sediment transport mechanism. Observation in the field shows the presence of coral fragments, marine and terrestrial shells in an anomalous sequence on the top of marine terraces. Other characteristics of anomalous sequence are 15-20 cm thick, fining upward, predominantly medium to coarse sand, moderately sorted to very poorly sorted, containing a lot of planktonic and benthic foraminifera, and presence of rip-up clast. The age of foraminiferal assemblages depicts Pleistocene-Holocene. Additionally, paleo-bathymetry of foraminiferal assemblages is dominated from middle Neritic (30-100 m under sea level). The anomalous sequence is related to 2000 years old sequence of tsunami in Ishigaki and Miyako Islands, Japan. These events probably attributed with tectonic activity in Ryukyu Trench. The conclusion of this research is that the tsunami events did occur on the eastern coast of Taiwan in the Quaternary Period.
