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Seismograph
Seismographs are used by seismologists to record seismic waves. By studying seismic waves, geologists can map out the interior of the Earth.
When an earthquake occurs, seismographs near the epicenter are able to record both S and P waves, but those on the other side of the Earth can only record P waves.
See also: Lehmann, Inge, Oldham, Richard Dixon
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