Development of a High-Gain Rotational-Motion Seismograph

高增益旋转地震仪的研制

• 批准号: 11354004
• 负责人: TAKEO Minoru
• 金额: $ 22.78万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11354004/
• 关键词: Seismograph; Strong Motion; 地動回転成分

The aim of this research program is to develop a new fiber optic gyro for measuring rotational motion of seismic waves. The target value of sensitivity is less than 10^<-9> rad/sec for portable type and 10^<-1> rad/sec for long-period type. The frequency ranges are 0.02 Hz - 50 Hz for portable type and 0.01 HZ - 1 Hz for long-period type. Fiber optic gyro has the following advantages. It is easy to increase sensitivity by enlarging the size of the fiber coil, and it has no moving elements which make internal noise. Because of these advantages, we select a fiber optic technology as a basic technology of the rotational-motion seismograph. We have succeeded in developing a triaxial rotational seismograph using three high-gain fiber optic gyros whose internal noise is reduced down to 5 x 10^<-9> rad/sec. To confirm the performance of the new high-gain rotational seismograph, we perform a parallel operation using another rotational sensor based on a different technology. We used a rotational sensor model R1 produced by EENTEC.The R-1 is in a line of sensors using state-of-the-art electro chemical technology, and the resolution is 5 x 10^<-7> rad/sec at 1 Hz. Anyway, we have succeeded in developing the new high-gain rotational seismograph which can record local small earthquakes.

本课题的研究目的是研制一种新型光纤陀螺，用于测量地震波的旋转运动。便携式型灵敏度目标值小于10^<-9> rad/sec，长周期型灵敏度目标值小于10^<-1> rad/sec。便携型的频率范围为0.02 Hz - 50 Hz，长周期型的频率范围为0.01 Hz - 1 Hz。光纤陀螺具有以下优点：通过增大光纤线圈的尺寸，易于提高灵敏度，并且没有产生内部噪声的运动元件。由于这些优点，我们选择光纤技术作为旋转地震仪的基础技术。我们成功地开发了一种使用三个高增益光纤陀螺的三轴旋转地震仪，其内部噪声降低到5 × 10^<-9> rad/sec。为了确认新型高增益旋转地震仪的性能，我们使用另一种基于不同技术的旋转传感器进行并行操作。我们使用了EENTEC生产的旋转传感器R1模型。R-1是一系列使用最先进的电化学技术的传感器，在1hz下分辨率为5 x 10^<-7> rad/秒。不管怎样，我们已经成功地研制出了可以记录局部小地震的新型高增益旋转地震仪。

项目成果

Minoru Takeo: "Ground rotational motions recorded in near-source region"Geophy.Res.Lett.. 25.6. 789-792 (1998)

Minoru Takeo：“近源区域记录的地面旋转运动”Geophy.Res.Lett.. 25.6。

Takeo, M.: "Ground rotational motions recorded in near-source region"Geophysical Research Letters. 25. 789-792 (1998)

Takeo, M.：“近源区域记录的地面旋转运动”地球物理研究快报。

Wu, C., M. Takeo, and S. Ide: "Source Process of the Chi-Chi Earthquake"Bulletin of the Seismological Society of America. 91. 1128-1143 (2001)

Wu, C.、M. Takeo 和 S. Ide：“Chi-Chi 地震的震源过程”美国地震学会通报。

Wu, C., M.Takeo, S.Ide: "Source Process of the Chi-Chi Earthquake"Bulletin of the Seismological Society of America. 91. 1128-1143 (2001)

Wu, C., M.Takeo, S.Ide：“Chi-Chi 地震的震源过程”美国地震学会通报。