Recurrence Intervals of Mega Nankai Earthquakes recorded in tsunami sediments

海啸沉积物记录的南海特大地震的复发间隔

• 批准号: 19310117
• 负责人: MATSUOKA Hiromi
• 金额: $ 12.48万
• 依托单位: Kochi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2007
• 资助国家: 日本
• 起止时间: 2007 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19310117/
• 关键词: 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

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.

为了揭示南开地震的史前证据，研究了日本西南诸岛南开海槽沿岸池塘和湖泊的岩心沉积物。海啸事件的平均复发间隔为300 ~ 350年。这个值比历史事件的100-200年的值大得多。这一结果表明，相对较大的南开地震只记录在沉积物中。