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2001 Fiscal Year Final Research Report Summary

Development of a High-Gain Rotational-Motion Seismograph

Research Project

Project/Area Number 11354004
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section展開研究
Research Field 固体地球物理学
Research InstitutionThe University of Tokyo

Principal Investigator

TAKEO Minoru  Earthquake Research Institute, The University of Tokyo, Professor, 地震研究所, 教授 (00197279)

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)
Project Period (FY) 1999 – 2001
KeywordsSeismograph / Strong Motion
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.

  • Research Products

    (4 results)

All Other

All Publications (4 results)

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

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Wu, C., M.Takeo, S.Ide: "Source Process of the Chi-Chi Earthquake"Bulletin of the Seismological Society of America. 91. 1128-1143 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takeo, M.: "Ground rotational motions recorded in near-source region"Geophysical Research Letters. 25. 789-792 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] 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)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2003-09-17  

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