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Tsunami recurrence revealed by Porites coral boulders in the southern Ryukyu Islands, Japan

2013; Geological Society of America; Volume: 41; Issue: 8 Linguagem: Inglês

10.1130/g34415.1

1943-2682

Daisuke Araoka, Yūsuke Yokoyama, Atsushi Suzuki, Kazuhisa Goto, Kunimasa Miyagi, K. Miyazawa, Hiroyuki Matsuzaki, Hodaka Kawahata,

Methane Hydrates and Related Phenomena

Research Article| August 01, 2013 Tsunami recurrence revealed by Porites coral boulders in the southern Ryukyu Islands, Japan Daisuke Araoka; Daisuke Araoka * 1Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan2Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa 277-8564, Japan *E-mail: araoka@aori.u-tokyo.ac.jp. Search for other works by this author on: GSW Google Scholar Yusuke Yokoyama; Yusuke Yokoyama 2Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa 277-8564, Japan3Department of Earth and Planetary Science, The University of Tokyo, Tokyo 113-0033, Japan4Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan Search for other works by this author on: GSW Google Scholar Atsushi Suzuki; Atsushi Suzuki 5Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8567, Japan Search for other works by this author on: GSW Google Scholar Kazuhisa Goto; Kazuhisa Goto 6International Research Institute of Disaster Science, Tohoku University, Sendai 980-8579, Japan Search for other works by this author on: GSW Google Scholar Kunimasa Miyagi; Kunimasa Miyagi 7Ishigaki-jima Island Local Meteorological Observatory, Japan Meteorological Agency, Ishigaki 907-0004, Japan Search for other works by this author on: GSW Google Scholar Keitaro Miyazawa; Keitaro Miyazawa 8Disaster Control Research Center, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan Search for other works by this author on: GSW Google Scholar Hiroyuki Matsuzaki; Hiroyuki Matsuzaki 9Department of Nuclear Engineering and Management, School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan Search for other works by this author on: GSW Google Scholar Hodaka Kawahata Hodaka Kawahata 2Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa 277-8564, Japan3Department of Earth and Planetary Science, The University of Tokyo, Tokyo 113-0033, Japan5Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8567, Japan Search for other works by this author on: GSW Google Scholar Author and Article Information Daisuke Araoka * 1Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa 277-8561, Japan2Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa 277-8564, Japan Yusuke Yokoyama 2Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa 277-8564, Japan3Department of Earth and Planetary Science, The University of Tokyo, Tokyo 113-0033, Japan4Institute of Biogeosciences, Japan Agency for Marine-Earth Science and Technology, Yokosuka 237-0061, Japan Atsushi Suzuki 5Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8567, Japan Kazuhisa Goto 6International Research Institute of Disaster Science, Tohoku University, Sendai 980-8579, Japan Kunimasa Miyagi 7Ishigaki-jima Island Local Meteorological Observatory, Japan Meteorological Agency, Ishigaki 907-0004, Japan Keitaro Miyazawa 8Disaster Control Research Center, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan Hiroyuki Matsuzaki 9Department of Nuclear Engineering and Management, School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan Hodaka Kawahata 2Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa 277-8564, Japan3Department of Earth and Planetary Science, The University of Tokyo, Tokyo 113-0033, Japan5Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8567, Japan *E-mail: araoka@aori.u-tokyo.ac.jp. Publisher: Geological Society of America Received: 24 Jan 2013 Revision Received: 15 Apr 2013 Accepted: 15 Apr 2013 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2013 Geological Society of America Geology (2013) 41 (8): 919–922. https://doi.org/10.1130/G34415.1 Article history Received: 24 Jan 2013 Revision Received: 15 Apr 2013 Accepted: 15 Apr 2013 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Daisuke Araoka, Yusuke Yokoyama, Atsushi Suzuki, Kazuhisa Goto, Kunimasa Miyagi, Keitaro Miyazawa, Hiroyuki Matsuzaki, Hodaka Kawahata; Tsunami recurrence revealed by Porites coral boulders in the southern Ryukyu Islands, Japan. Geology 2013;; 41 (8): 919–922. doi: https://doi.org/10.1130/G34415.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Information about past tsunami hazards, such as their recurrence interval and magnitude, is needed for future disaster prediction and mitigation. We examined radiocarbon ages of the surfaces of massive coral boulders cast ashore by past tsunamis in the southern Ryukyu Islands, Japan, where few historical and geological records of past tsunamis are available. We selected only non-eroded Porites coral boulders along the shoreline, because their characteristics make it possible to determine the probable timing of their deposition by tsunamis, and we applied a dating method that uses the cumulative probability distributions of large numbers of radiocarbon measurements of those boulders to determine the timing of past tsunamis. The results demonstrate that the southern Ryukyu Islands have repeatedly experienced tsunami events since at least 2400 yr ago, with a recurrence interval of ∼150–400 yr. The largest Porites tsunami boulder that we studied (long axis, 9 m), which is probably the largest single-colony tsunami boulder in the world, was displaced by the A.D. 1771 Meiwa tsunami. Although the 1771 Meiwa tsunami was likely the largest event in at least the past 700 yr, calculations of current velocity show that all identified tsunamis occurring before 1771 were probably large enough to cause considerable damage to human-built structures and loss of life. This study demonstrates that by reliably dating large numbers of selected coastal boulders it is possible to ascertain the timing, recurrence interval, and magnitude of past tsunamis in a location where few adequate survey sites of sandy tsunami deposits exist. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.