Study of Single-fouce seismic source for deep borehole and seafloor deployment

深孔及海底部署单源震源研究

• 批准号: 24654145
• 负责人: YAMAOKA Koshun
• 金额: $ 2.41万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-24654145/
• 关键词: 観測手法; 震源装置; 地震波伝播変動; 孔内観測; 自由落下; モニタリング; 地震波速度; 地下モニタリング

A seismic source for long-term monitoring of propagation property by deploying in deep-borehole and seafloor are designed. We produced trial models for such a seismic source to test the feasibility of our conceptual design. The difficult requirement in borehole and seafloor environment is low-power consumption, i.e. 50watts. We developed a model with falling mass in a cylinder body to produce single-force, which is suitable to produce low-frequency signal with small body. Experiments using trial model shows that falling-mass source works well but falling trajectory varies substantially due to friction of mass and mass guide. This requires the monitoring of the mass falling.

设计了一种可在深井和海底长期监测地震波传播特性的震源。我们制作了这种震源的试验模型，以测试我们概念设计的可行性。在钻孔和海底环境中的困难要求是低功耗，即50瓦。提出了一种在圆柱体中产生单力的下落质量模型，该模型适用于小体积物体产生低频信号。实验结果表明，落块源工作良好，但落块运动轨迹会因落块和落块导轨的摩擦而发生较大变化。这就需要对质量下落进行监测。

项目成果

海底への設置をめざしたシングルフォース震源の開発

开发旨在安装在海底的单力震源

• 发表时间: 2014
• 作者: 山岡耕春