Question

How does siesmograph works?

Answer 1

A seismograph is a device for measuring the movement of the earth, and consists of a ground- motion detection sensor, called a seismometer, coupled with a recording system. ... As the earth moves, the relative motion between the weight and the earth provides a measure of the vertical ground motion.

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Answer 2

Seismographs can detect quakes that are too small for humans to feel. During an earthquake, ground-shaking seismic waves radiate outward from the quake source, called the epicenter. Different types of seismic waves travel at different speeds and through different parts of the Earth during a quake.