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.

该研究计划的目的是开发一种新的光纤陀螺仪，用于测量地震波的旋转运动。对于便携式类型，灵敏度的目标值小于10^<-9> rad/sec，对于长期类型而言，敏感性小于10^<-1> rad/sec。对于便携式类型的频率范围为0.02 Hz -50 Hz，长周期类型为0.01 Hz -1 Hz。光纤陀螺仪具有以下优势。通过扩大纤维线圈的大小，很容易提高灵敏度，并且没有使内部噪音的移动元素。由于这些优势，我们选择了一项光纤技术作为旋转运动地震仪的基本技术。我们已经成功地使用了三个高增益光纤陀螺仪开发三轴旋转地震仪，该光纤的内部噪声被降低至5 x 10^<-9> rad/sec。为了确认新的高增益旋转地震仪的性能，我们使用基于其他技术的另一个旋转传感器进行并行操作。我们使用了由EENTEC生产的旋转传感器模型R1。R-1使用最先进的电化学技术在传感器线中，分辨率为1 Hz的5 x 10^<-7> rad/sec。无论如何，我们已经成功地开发了可以记录当地小地震的新的高增益旋转地震仪。

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。