A seismogram is the electronic recording made by a seismometer of the ground movements associated with earthquakes. The resulting diagram is wave-shaped with varying amplitudes and wavelengths since the movement at a measuring station during an earthquake is non-linear (see question "What are the period, wavelength and amplitude?"). The energy released by an earthquake (magnitude) as well as the location of its hypocenter can be estimated by evaluating a large number of such diagrams.

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Seismograms of the earthquake on 30 January 2014 near Gelterkinden in the canton of Basel-Landschaft

Seismograms of the earthquake on 30 January 2014 near Gelterkinden in the canton of Basel-Landschaft