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A seismometer is a device that measures the vibrations made be earthquakes. (seismic waves) Seismic waves consist of P(primary) waves LONGITUDIUAL think of them as "PUSH AND PULL" waves because they move buildings up or down. The other wave is the s(seconday) waves TRANVERSE think of them as "SHAKE TO SIDE" waves because they shake buildings from side to side.

Both waves are very dangerous and can do a lot of damage and a seismometer detects this.

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