What Is a Seismograph Used for?

Answer

A seismograph is an instrument that is used for recording accurately the earth's movement during earthquakes. A seismograph that is in good condition is connected to the bedrock to avoid data pollution, which may display inaccurate information of the earthquake.
2 Additional Answers
A seismograph is an instrument for automatically detecting and recording the intensity, direction, and duration of a movement of the ground, especially of an earthquake. It can also be defined as an instrument that records the intensity and duration of earthquakes and similar tremors.
A seismograph is a sensitive instrument used to measure and record seismic waves generated by earthquakes. Details of the earthquakes such as force and duration can be easily detected by this instrument. Advances in seismograph technology have enabled scientists to gauge the magnitude of earthquakes.
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