- What Is Richter Magnitude?
John N. Louie, Ph.D provides the short and long explanation on how the Richter scale measures earthquake magnitude.
www.seismo.unr.edu/ftp/pub/louie/class/100/magnitude.html
- Wikipedia: Richter Magnitude Scale
Explains the history and methodology of the Richter magnitude scale, which measures earthquake magnitude by assigning a single number to quantify the size.
en.wikipedia.org/wiki/Richter_scale
- USGS: The Richter Magnitude Scale
Explanation on how the Richter Scale uses seismographs to determine earthquake magnitude.
neic.usgs.gov/neis/general/richter.html
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