Recurrence Intervals of Mega Nankai Earthquakes recorded in tsunami sediments

• Project/Area Number: 19310117
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Natural disaster science
• Research Institution: Kochi University
• Principal Investigator: MATSUOKA Hiromi Kochi University, 教育研究部自然科学系, 准教授 (60222296)
• Co-Investigator(Kenkyū-buntansha): OKAMURA Makoto 高知大学, 教育研究部自然科学系, 教授 (10112385)
• Project Period (FY): 2007 – 2009
• Project Status: Completed (Fiscal Year 2009)
• Budget Amount: ¥19,500,000 (Direct Cost: ¥15,000,000、Indirect Cost: ¥4,500,000); Fiscal Year 2009: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000); Fiscal Year 2008: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000); Fiscal Year 2007: ¥8,840,000 (Direct Cost: ¥6,800,000、Indirect Cost: ¥2,040,000)
• Keywords: 津波堆積物 / 津波 / 地震 / 南海地震 / 巨大地震 / 再来周期 / 自然災害 / 地質学

Research Abstract

We investigated core sediment from ponds and lakes along the coast of southwestern Japanese Islands along the Nankai Trough to reveal pre-historical evidence of Nankai earthquakes. The average recurrence interval of tsunami events were 300-350 years. This value was much larger than the value, 100-200 years, of the historical events. This result implies that relatively large Nankai earthquakes only have been recorded in the sediments.

Research Products

• [Presentation] 四国沿岸域の湖沼に残された津波堆積物からみた南海地震の再来周期と規模 (2010)
  • Author(s): 岡村眞
  • Organizer: 地球惑星科学連合大会
  • Place of Presentation: 千葉
  • Year and Date: 2010-05-24
• [Presentation] Tsunami events of the Nankai Earthquakes during the last 4500 years (2010)
  • Author(s): Matsuoka, H
  • Organizer: Hokudan 2010 International Symposium on Active Faulting
  • Place of Presentation: Awaji city, JAPAN
  • Year and Date: 2010-01-18
• [Presentation] Nankai earthquakes recorded in tsunami sediments during the last 5000 years (2009)
  • Author(s): Matsuoka, H
  • Organizer: American Geophysical Union Fall Meeting
  • Place of Presentation: San Francisco, USA
  • Year and Date: 2009-12-16
• [Presentation] Pre-historical Nankai earthquakes recorded in sediments of ponds along the southern coast of Shikoku Island, southwestern JAPAN (2008)
  • Author(s): Matsuoka, H
  • Organizer: 6th International Conference on Asian Marine Geology
  • Place of Presentation: Kochi, JAPAN
  • Year and Date: 2008-08-30
• [Presentation] Pre-historical Nankai earthquakes recorded in sediments of ponds along the southern coast of Shikoku Island, southwestern JAPAN (2008)
  • Author(s): Matsuoka, H., Okamura, M.
  • Organizer: 6th International Conference on Asian Marine Geology
  • Place of Presentation: 高知工科大学、高知県
  • Year and Date: 2008-08-30
• [Remarks] 新聞、テレビ報道等2008年1月7日高知新聞掲載2008年9月2日高知新聞掲載2008年10月7日RKC高知放送放映2008年12月16日RKC高知放送放映2009年1月13日NHK高知放映2009年1月17日静岡第一テレビ放映2010年3月14日NHKスペシャル放映2010年3月15日NHK高知放映
  • URL: http://sc1.cc.kochi-u.ac.jp/~mako-ok/index.html
• [Remarks]
  • URL: http://scl.cc.kochi-u.ac.jp/^mako-ok/index.html
• [Remarks]
  • URL: http://scl.cc.kochi-u.ac.jp/~mako-ok/index.html
• [Remarks]
  • URL: http://scl.cc.kochi-u.ac.jp/~mako-ok/index.html