Seismometers are instruments that measure motion of the ground... - dofaq.co
seismometer

Seismometers are instruments that measure motion of the ground...

wikipedia - 18 Sep 2015
Seismometers are instruments that measure motion of the ground, including those of seismic waves generated by earthquakes, volcanic eruptions, and other seismic sources. Records of seismic waves allow seismologists to map the interior of the Earth, and locate and measure the size of these different sources.

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