- How Are Earthquakes Studied?
 - About seismographs and how they work, from the first one made in China to modern electronic seismographs. - Make Your Own Seismogram
- Render your own seismogram with the help of the Northern California Earthquake Data Centre. Select a station, channel, and time period for your plot.
- USGS: Seismographs
- Describes how this instrument is used to measure earthquakes, how to read seismograms, and how to create your own seismometer.
- Wikipedia: Seismometer
- Article on how the seismometer (or seismograph) operates to measure earthquakes.
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