Question

How does a seismograph work?​

Answer 1

Explanation:

Seismographs record seismic waves. They contain a weight and a pen attached to a spring (below). The seismograph is bolted to the ground so during an earthquake it moves with the ground, whilst the weight and pen remain still. The pen moves across a rotating paper roll recording the seismic waves.

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Answer 2

Answer:

Seismographs are securely mounted to the surface of the Earth, so when the ground starts shaking, the instrument's case moves....

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