Measurement of Microtremor by Using a Laser Interferometer

DOI Web Site 2 Citations
  • ASAKAWA Kenichi
    Research Laboratory of Precision Machinery and Electronics Tokyo Institute of Technology
  • TAKO Toshiharu
    Research Laboratory of Precision Machinery and Electronics Tokyo Institute of Technology
  • HIRATA Shoji
    Research Laboratory of Precision Machinery and Electronics Tokyo Institute of Technology

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Other Title
  • レーザー干渉計による地面振動の測定
  • レーザー カンショウケイ ニヨル ジメン シンドウ ノ ソクテイ

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Abstract

A 50 meter modified Michelson interferometer has been installed in an underground tunnel in the Nagatsuta campus of Tokyo Institute of Technology. It is enclosed by vacuum pipes and illuminated by a frequency stabilized 633 nm He-Ne laser. The displacement of the interference fringes is converted to voltage with an accuracy of about 1×10-10. From the spectral analysis of the fluctuations of the interference fringes, it is found that the power spectral densityof the microtremor at the quiet time has peakes at 1 cycle/day and its har-monics, also at 0.3, 0.6, and 3 Hz, and that the values at around 10 Hzincrease when cars pass by on the road near the tunnel.

Journal

  • Oyo Buturi

    Oyo Buturi 48 (6), 519-525, 1979

    The Japan Society of Applied Physics

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