SMAC型強震計

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書誌事項

タイトル別名
  • “SMAC” Strong Motion Accelerometer
  • SMACガタ キョウシンケイ
  • “SMAC” Strong Motion Accelerometer

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抄録

This accelerometer has been designed and constructed by the “Strong Motion Accelerometer Committee, ” members of which are Nobuji NASV, Hiroshi KAWASUMI, Takahiro HAGIWARA, Kiyoshi MERO, Kiyoshi LANAI, Kenzaburo TAKEYAMA, Kazuhiko AKASHI and I. “SMAC” stands for the name of the committee. Expenses were granted from the Fund for the Experimental Researches of the Education Department.<br>The merits of the present accelerometer lie in that it has been very carefully constructed so as it can record faithfully the acceleration of earthquakes as large as 1000 gals, and also in that it has large recording speed and a special device to record automatically two more after-shocks which would follow the main one. Easiness of maitenance is another merit; the investigation by an expert once a year and care taken by a watchman once or twice a month are all that is necessary.<br>It starts automatically to record earthquakes greater than 1.0 gals, stops recording automatically after a 3-minute running, and repeats this start-and-stop motion for successive threee earthquakes. It has a mechanical starter besides an electric one. Record is made by scratching a roll of stylus paper by a saphire needle. We can obtain by this means a very sharp record, which enables us direct printing on to photographic paper, or photographic enlarging up to 10 times the original.<br>It has also a special equipment for inspecting the action of the instrument.<br>Essentials of the accelerometer are as follows:<br>(A) Accelerometer proper<br>1) Type: 3-component pendulum type accelerometer.<br>2) Proper period: 0.1 sec.<br>3) Sensitivity: 25 gals per mm on the record.<br>4) Magnification: X16, mechanical.<br>5) Recording method: Scratching stylus paper.<br>6) Working Range: 10 to 1000 gals.<br>7) Recording speed: 1cm/sec.<br>(B) Driving device<br>1) Type: Hand-wound spring clockwork.<br>2) Action: Starting thrice, 3-minute running for each start.<br>3) Starter: Falling ball starter. (Sensitivity: 100 gals)<br>4) Governer: Centrifugal, instantaneous start.<br>(C) Time-marker<br>1) Type: hand-wound clock with electric contact points and electric starter.<br>2) Time mark: every 1 sec.<br>(D) Electric starter<br>1) Type: Vertical accelerometer with period 0.3 sec.<br>2) Sensitivity: 10 gals.<br>3) Electric contact points: 6 platinum pts in parallel.<br>(E) Electric Source<br>1) Dry cells: 12 volts.

収録刊行物

  • 地震　第２輯

    地震　第２輯 6 (3), 117-121, 1953

    公益社団法人 日本地震学会

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