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