Chronological study on widespread tephras for the past 50,000 years in and around Japanese Islands

Mitsuru OKUNO; Masayuki TORII; Toshio NAKAMURA

Presentation information

Oral

Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS30_28AM1] Paleoclimatology and paleoceanography

Mon. Apr 28, 2014 9:00 AM - 10:45 AM 501 (5F)

Convener:*Kazuyoshi Yamada(School of Human Sciences, Waseda University), Minoru Ikehara(Center for Advanced Marine Core Research, Kochi University), Tomohisa Irino(Faculty of Environmental Earth Science, Hokkaido University), Yusuke Okazaki(Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University), Ikuko Kitaba(Kobe University Research Center For Inland Seas), Akihisa Kitamura(Institute of Geosciences, Faculty of Science, Shizuoka University), Masaki Sano(Research Institute for Humanity and Nature), Ryuji Tada(Department of Earth and Planetary Science, Graduate School of Science, The Univeristy of Tokyo), Masakazu Yoshimori(Atmosphere and Ocean Research Institute, University of Tokyo), Chair:Kazuyoshi Yamada(School of Human Sciences, Waseda University)

10:30 AM - 10:45 AM

[MIS30-07] Chronological study on widespread tephras for the past 50,000 years in and around Japanese Islands

*Mitsuru OKUNO¹, Masayuki TORII², Toshio NAKAMURA³ (1.Fac. Sci., Fukuoka Univ., 2.Grad. Sch., Sci. Tech., Kumamoto Univ., 3.CCR, Nagoya Univ.)

Keywords:widespread tephra, radiocarbon dating

After discovery of Aira Tn (AT) tephra, many widespread tephras have been recognized. The tephra for the past 50,000 years can be dated by the radiocarbon (¹⁴C) age determination. All ¹⁴C dates for tephras after Spfa-1 can be calibrated to a calendar year using calibration dataset "IntCal13". On the other hand, the stratigraphy and the age of tephras intercalated with core sample from marine and lake have been made highly precise. In this presentation, we review the chronological research on widespread tephras for the past 50,000 years, and then present its perspective