| dc.description.abstract | 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. | en_US |