広帯域速度型強震計の開発とその記録範囲

• 村松 郁栄

書誌事項

タイトル別名

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

抄録

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.

収録刊行物

• 地震　第２輯

  地震　第２輯 48 (2), 247-256, 1995

  公益社団法人 日本地震学会

キーワード

• Broadband velocity type strong motion seismometer
• Recording range
• Coupled pendulum
• Effects of oil temperature
• Environmental noises

詳細情報

• CRID: 1390001204306459776
• NII論文ID: 10002499655
• NII論文ID: 10003846101
• NII書誌ID: AN00305741
• DOI: 10.4294/zisin1948.48.2_247
• ISSN: 18839029
• ISSN: 2186599X
• ISSN: 00371114
• NDL書誌ID: 3623847
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3623847
• Web Site: https://www.jstage.jst.go.jp/article/zisin1948/48/2/48_2_247/_pdf
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