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How does seismograph measure the magnitude of the earthquake.

Aakash Shah
seismograph
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How does seismograph measure the magnitude of the earthquake elucidate with picture.

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Aakash Shah

Seismograph is the instrument that measures the magnitude of the earthquake. A sensor that identifies the vibration of the earth surface is connected to it.

  1. The seismograph is placed firmly on the land.
  2. A weight box is hanged on the frame in a spring.
  3. The round object on the right side is called drum and it rotates from left to right like the earth.
  4. A carbon pencil is kept on the weight box which touches the drum. When the drum rotates, the pencil continuously makes round circle on it.
  5. When there is a vibration on earth, the pencil makes the curve on the drum. The length of the curve line is measured with a scale to know the magnitude.
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