- Wikipedia: Seismometer
Article on how the seismometer (or seismograph) operates to measure earthquakes.
en.wikipedia.org/wiki/Seismometer
- How Are Earthquakes Studied?
About seismographs and how they work, from the first one made in China to modern electronic seismographs.
www.geo.mtu.edu/UPSeis/studying.html
- USGS: Seismographs
Describes how this instrument is used to measure earthquakes, how to read seismograms, and how to create your own seismometer.
earthquake.usgs.gov/faq/seismo.html
- 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.
www.ncedc.org/bdsn/make_seismogram.html
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