| Project/Area Number |
11354004
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
固体地球物理学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
TAKEO Minoru Earthquake Research Institute, The University of Tokyo, Professor, 地震研究所, 教授 (00197279)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Kazuo Japan Aviation Electronics Industry, Limited, No2 Technology Division, 第2技術部, 部長/研究職
MORITA Yuichi Earthquake Research Institute, The University of Tokyo, Associate Professor, 地震研究所, 助教授 (30220073)
FUKAO Yoshio Earthquake Research Institute, The University of Tokyo, Professor, 地震研究所, 教授 (10022708)
新谷 昌人 東京大学, 地震研究所, 助手 (30272503)
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| Project Period (FY) |
1999 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥35,600,000 (Direct Cost: ¥34,400,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2001: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2000: ¥16,900,000 (Direct Cost: ¥16,900,000)
Fiscal Year 1999: ¥13,500,000 (Direct Cost: ¥13,500,000)
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| Keywords | Seismograph / Strong Motion / 地動回転成分 |
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| Research Abstract |
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.
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