Recent Progress on Coral Reef Terrace Studies in Japan
We review the progress on coral reef terrace studies in Japan since 1990. We first summarize recent progress in the study of paleo-sea-level indicators which are based on the present-day coral assemblage in the Ryukyu Islands. Five coral assemblages as different water depth indicators are used for analysis of coral terraces in the Ryukyu Islands and also in the Huon Peninsula, Papua New Guinea. In addition to the water depth analysis, an accurate dating of corals by the alpha-spectrometric method resulted in revision of paleo-sea-level heights on the Huon Peninsula, which has been used as one of the standards for Quaternary sea level studies. We also point out the finding of isotope stage 3 corals at rapidly uplifting Kikai Island. Heights of stage 5e coral terraces show differential tectonic uplift among islands on the overriding Eurasian plate and on the subducting Philippine Sea plate. Japanese contributions on overseas coral terrace studies are summarized, emphasizing coseismic uplift as a major cause of tectonic uplift.
第四紀研究 38(3), 228-236, 1999-06-01
Japan Association for Quaternary Research