Development of a Broadband Velocity Type Strong Motion Seismometer and Its Recording Range

DOI Web Site Web Site 4 Citations 46 References

Bibliographic Information

Other Title
  • 広帯域速度型強震計の開発とその記録範囲
  • コウタイイキ ソクドガタ キョウシンケイ ノ カイハツ ト ソノ キロク ハン

Search this article

Abstract

We developed a broadband velocity type strong motion seismometer for near-field observation of large earthquakes. The recording range of the seismometer is from 100cm/s to 5×10-5cm/s in the period range from 0.05s to 600s. The upper limit of the recording range was examined by large displacement tests and strong shock tests. The lower limit was determined by the response to small amplitude sinusoidal calibration current.<br>The seismometer utilizes a coupled pendulum which consists of two pendulums connected each other by flexible crossing wires and is immersed in highly viscous silicon oil. This structure eliminates the cross-coupling error and suppresses the parasitic oscillations during the strong earthquake motions.<br>The effects of oil temperature on the sensitivity of velocity seismometer and the drift of vertical component were studied in detail. They were reduced to a sufficiently small level by means of a simple thermal shield of styrofoam cover. The effect of atmospheric pressure is found to be negligiblly small. The effects of other environmental noises on the seismometer were also examined.

Journal

Citations (4)*help

See more

References(46)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top