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.

这项研究旨在利用日本西南部室户岬及其周围沿海岩石上附着的凸起钙质组合物，揭示自距今 5000 年来南海海槽沿线大地震的历史。我在1977年和1998年从大型组合体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年，我根据近两年的分析，绘制了凸起组合体生长过程的等时线图。结果表明，在目前海拔9m和6.7m处，相对海平面的稳定阶段分别从4500BP到2700BP和2700BP到1750BP持续。距今5000年以来室户岬的隆起归因于板内地震和板间地震的共同作用，尽管间隔2000年发生的板内累积隆起将占主导地位我发现了一些本应生存的生物在单独的潮汐范围内，例如钻孔核心中的珊瑚或钙质藻类。通过对这些生物的年龄和种类的分析，我可以知道板间地震发生的时间。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: "隆起環虫類棲管化石の成長過程からみた室戸岬の完新世地震性地殻変動" 日本地理学会発表要旨集. 54. 292-293 (1998)

Hideaki Maemoku：“从高位环节动物管化石的生长过程中看出室户岬的全新世地震地壳变形”，日本地理学会学报，54。292-293（1998）。