Separate extraction of ocean infragravity waves and seismic waves by multi-scale very-broadband observation of water pressure

多尺度超宽带水压观测分离提取海洋次重力波和地震波

• 批准号: 23654162
• 负责人: FUKAO Yoshio
• 金额: $ 2.5万
• 依托单位: Japan Agency for Marine-Earth Science and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2012
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23654162/
• 关键词: 海底水圧観測; 高感度水圧計; 海洋波動現象; 海底観測; 海底地震学; 水圧計; 地震計

We developed an ocean bottom high-resolution water pressure measuring system using a newly released water-pressure sensor counting quartz-oscillation frequency. We installed this observation system on the seafloor off Miyagi prefecture and recovered it after three months. We confirmed that seismic event with magnitudes less than 3 can be detected with high S/N ratios on the 20Hz-sampling records. We also confirmed that by adjusting the sampling rate, the system can record ground noise whose rms amplitude is three orders of magnitude lower than the tremor amplitude in seismically quiet days.

我们使用新发布的计算石英振荡频率的水压传感器开发了海底高分辨率水压测量系统。我们在宫城县附近的海底安装了这个观测系统，并在三个月后将其回收。我们证实，在 20Hz 采样记录上，可以通过高信噪比检测到震级小于 3 的地震事件。我们还证实，通过调整采样率，系统可以记录地面噪声，其均方根振幅比地震安静时的震颤振幅低三个数量级。

项目成果

The elastic rebound process of the 2011 Mw 9.0 Tohoku=oki earthquake

2011年Mw 9.0 Tohoku=oki地震的弹性回弹过程

• 作者: Yoshio Fukao

The 2011 Mw9.0 Tohoku-Oki Earthquake: Joint occurrence of tectonic stress-driven and lithostatic stress-driven slips along the plate boundary

2011年Mw9.0东北冲地震：构造应力驱动和岩性应力驱动沿板块边界滑动的联合发生

• 发表时间: 2011
• 作者: Fukao; Y.; T. Hori;S. Kodaira
• 通讯作者: S. Kodaira

Occurrence of very-low-frequency earthquakes along the decollement of the Nankai trough as evidenced by broadband ocean bottom seismometer observations

宽带海底地震仪观测证实南海海槽滑脱沿线发生甚低频地震

• 发表时间: 2011
• 作者: Fukao; Y. ;VLF seminar group
• 通讯作者: VLF seminar group