What is a seismograph?

A seismograph is a scientific instrument which records information about the duration, intensity, and direction of a seismic disturbance, classically an earthquake.

In addition to registering earthquakes, seismographs can also track large explosions, tidal waves, and other events which cause the ground to shake.

These devices are used to gather more information about seismic disturbances, and to monitor the earth for early warning signs of seismic events.

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