Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS11] tsunami deposit

Tue. May 22, 2018 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall7, Makuhari Messe)

convener:Tetsuya Shinozaki(Center for Research in Isotopes and Environmental Dynamics (CRiED), University of Tsukuba), Takashi Chiba(Maritime Disaster Prevention Center), Daisuke Ishimura(首都大学東京大学院都市環境科学研究科地理学教室)

[MIS11-P17] Supercycle of Nankai Earthquakes recorded in sediments from Tadasu-Ike Pond, Southern Coast of Shikoku Island along Nankai Trough.

*Hiromi Matsuoka1, Makoto Okamura1 (1.Kochi University)

Keywords:Nankai Trough, Nankai Earthquakes, tsunami sediments, supercycle

The supercycle of Nankai Earthquakes was seen in sediments from Tadasu-Ike Pond along Nankai Trough. Tadasu-Ike pond has 17 tsunami events in sediments from 1000 yBP to 4500 yBP. The events of 4000, 3400, 2700, 2000 and 1300 yBP are large size tsunami events. After these five events, size of tsunami events of each cycle decreases with time. Cyclic change in size of tsunami event is seen five times in 700 years cycle during 3500 years.