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Much like sunlight contains different colors that can be split apart with a prism, seismic waves contain many different "frequencies" that we can record with specially "tuned" seismometers. you can read the below link it will give you good guide
http://eqseis.geosc.psu.edu/~cammon/HTML/Classes/IntroQuakes/Notes/seismometers.html
best regards
Berhanu
There are two different seismic scale commonly used today. Magnitude scale measures the original energy of an earthquake, and Intensity scale measures the intensity of shaking occurring at any given point on the Earth's surface.
Richter magnitude scale, or Richter scale, assigns a magnitude number to quantify the energy released by an earthquake. It is a base-10 logarithmic scale. More info on Wiki: https://en.wikipedia.org/wiki/Richter_magnitude_scale
Best regards,
Djordje
