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Earthquakes: Seismogram A Shaking Record

A seismogram is a record of the ground shaking recorded by a seismograph.

The P waves travel fastest through the Earth so they arrive at a seismograph first, followed by the S waves and lastly by the surface waves.

The figure above is the seismogram of the 1989 Loma Prieta earthquake recorded at a seismograph in Kongsberg, Norway, 8400 km (about 5,200 miles) away.

A Siesmogram