Exploration for the history of large earthquake along

沿线大地震历史探索

• 批准号: 09680178
• 负责人: MAEMOKU Hideaki
• 金额: $ 1.92万
• 依托单位: Hiroshima University (1999)Yamaguchi University (1997-1998)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09680178/
• 关键词: coastal uplift; sessile organism; Nankai Trough; large earthquake; trench; Holocene; crustal movement; Cape Muroto; 完新区

This study aims to reveal the history of huge earthquakes along the Nankai Trough since 5,000 years BP using raised calcareous assemblages adhering to coastal rocks in and around Cape Muroto, southwestern Japan. I collected several boring cores from large assemblages and made an analysis on sedimentation and age of them in fiscal 1977 and 1998. In fiscal 1999, I made isochron map on the growth process of raised assemblages base on the analysis done in the last two years. The result is that stable phase in relative sea level had lasted since 4500 BP through 2700BP and since 2700BP through 1750BP at the present elevation of 9m and 6.7m respectively. Uplift of Cape Muroto since 5000BP is attributed to the combination of intra-plate earthquake and inter-plate earthquake, though accumulative uplift by intra-plate, which occurred at the interval of 2000 years, would be dominant I found some organisms which should have lived in separate tidal range such as coral or calcareous algae in the boring cores. I could know the timings of inter-plate earthquakes through the analysis on age and species of such organisms. The possibility would be handed over to the next project.

本研究旨在利用日本西南部Muroto角及其周围海岸岩石上的凸起钙质组合揭示5000年来南开海槽沿岸大地震的历史。我在1977和1998财政年度从大型组合中收集了几个钻孔岩心，并对它们的沉积和年龄进行了分析。在1999财政年度，我在过去两年的分析基础上，绘制了提高组合增长过程的等时线图。结果表明，在目前海拔9m和6.7m处，相对海平面稳定期分别为4500 ~ 2700BP和2700BP ~ 1750BP。Muroto角5000BP以来的隆升是板块内地震和板块间地震共同作用的结果，虽然板块内的累积隆升是主要的，但每隔2000年发生一次。我在钻孔岩心中发现了一些本应生活在单独潮汐范围内的生物，如珊瑚或钙质藻类。通过对这些生物的年龄和种类的分析，我可以知道板块间地震的时间。这种可能性将移交给下一个项目。

项目成果

前杢英明: "室戸岬に分布する隆起環虫類化石群体の成長過程"山口大学教育学部研究論叢. 49巻. 23-36 (1999)

前木英明：“室户岬分布的突起环节动物化石群落的生长过程”山口大学教育学院研究系列第49卷23-36（1999年）。

MAEMOKU Hideki: "Existence of another type of Nankai Earthquake suggested from the uplift history of Cape Muroto since 5000 BP."Chikyu Monthly. no. 24. 76-80 (1999)

前木英树：“从距今 5000 年以来室户岬的隆起历史中可以看出，存在另一种类型的南海地震。”地球月刊。

MAEMOKU Hideki: "Growth process of emerged fossil tubes of ANNELIDA in Cape Muroto, southwestern Japan."Bulletin of the Faculty of Education Yamaguchi University. vol. 49, part 2. 23-36 (1999)

前木秀树：“日本西南部室户岬出现的环节动物化石管的生长过程。”山口大学教育学院通报。

前杢英明: "室戸岬の最近数千年間の隆起様式から推定される新たな南海地震像"日刊地球. 号外No.24. 76-80 (1999)

Hideaki Maemoku：“根据室户岬过去几千年的隆起模式估算的南海地震的新图像”Nikkan Chikyu Extra No. 24. 76-80 (1999)。

前杢英明: "室戸岬の最近数千年間の隆起様式から推定される新たな南海地震像"月刊 地球. 号外No.24. 76-80 (1999)

前木秀明：“根据室户岬过去几千年的隆起模式估算的南海地震的新图像”月刊特刊第 24 期。76-80（1999 年）。