How can seismic waves be detected?

1 Answer
Dec 8, 2015



It is an instruments that detects and measures seismic waves.
This is an example of a seismograph. As you can see, it has a weight that is attached to a spring (sometimes wire). The weight is not attached directly to the earth, so even when the earth moves it will remain nearly still. There is a pen attached to the weight that records movement on a sheet of paper that is wound around a constantly rotating drum.
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This is what the record of wavy line is. The sheet of paper that has the record of the waves is called a seismogram.