where r seismograph is ??????
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Seismograph is an instrument used to measure the speed of an earthquake.
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A seismograph is an instrument which can record the seismic waves.
It contains a metal rod or a pendulum which can vibrate as the earthquake occurs.
The metal rod is attached to a pen which records the waves on the paper.
Scientists study these waves and then construct a map of the earthquake.
This also helps them in determining the power of the earthquake.
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