Japan Geoscience Union Meeting 2018

Presentation information

[JJ] Oral

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS11] tsunami deposit

Tue. May 22, 2018 1:45 PM - 3:15 PM 102 (1F International Conference Hall, 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), Chairperson:Ishimura Daisuke(Department of Geography, Tokyo Metropolitan University)

1:45 PM - 2:00 PM

[MIS11-11] Surveys of paleo tsunami deposits in Kunashir Island, the Northern Territories: Results obtained in the 2015-2017 projects and future issues

*Yuichi Nishimura1, Yasuhiro Takashimizu2, Daisuke Sugawara3, Takafumi Enya4, Takashi Chiba5,1, Alexander Shishikin6, Alexsey Gorbunov7, Victor Kaistrenko7, Asuka Takahashi8, Hiroki Muramatsu8, Yasuyuki Kawazoe8 (1.Graduate School of Science, Hokkaido University, 2.Institute of Humanities, Social Sciences and Education, Niigata University, 3.Museum of Natural and Environmental History, Shizuoka, 4.Hokkaido Museum, 5.Maritime Disaster Prevention Center, 6.Shikotan Geophysical Observatory, 7.Institute of Marine Geology and Geophysics, Russian Academy of Sciences, 8.Ministry of Education, Culture, Sports, Science and Technology)

Keywords:the Northern Territories, Kunashir Island, tsunami deposit

Surveys of paleo tsunami deposits in Kunashir Island, the Northern Territories, were carried out in 2015, 2016 and 2017, as parts of visa-free exchange programs of Japan and Russia. Each survey was conducted by 5-7 researchers from Japan and Russia for about 10 days. In 2015, the team made a reconnaissance survey at the central to southwestern part of the Pacific coast of the island including Furukammapu, Chikkapunai, and Tofutsu. In 2016 and 2017, the research area was expanded to east along the coast of from Chikappunai to Kuraoi River, where the higher tsunami was suggested by tsunami calculations assuming a huge earthquake off the Northern Territories. Through the surveys, it was found that many coastal wetlands suitable for paleo tsunami investigation were left on the island. There, tephras originated from volcanoes of Hokkaido and Kunashiri Island and the sandy layers that are candidates to be tsunami deposits are preserved. At the estuary of the Kuraoi River, a sand layer that can be a tsunami deposit associated with the1994 Hokkaido Toho-Oki Earthquake was distributed. Thus, it is expected that the Kunashiri is able to obtain important information about tsunamis in the south Kuril region that is used for disaster prevention. It will be one of the objectives to consider more practical and sustainable collaborative research strategies to use the results for disaster prevention.