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; 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.

这项研究旨在揭示自5000年以来BP自5000年以来，使用粘贴的钙质组合的巨大地震历史，这些组合粘贴到日本西南部穆罗托角及其周围的沿海岩石上。我从大型组合中收集了几个无聊的核心，并在1977年和1998财年的沉积和年龄进行了分析。在1999财年，我在过去两年中对升高组合基础的增长过程制作了等值线图。结果是，自4500 bp至2700bp以来，相对海平面的稳定阶段持续了持续，自2700bp至1750bp以来，目前的海拔9m和670万。 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.我可以通过分析这种生物的年龄和物种来了解板间地震的时间。可能性将移交给下一个项目。