Earthquakes have commonly been measured using the Richter scale. The scale is logarithmic and uses the recording from the largest seismic wave to determine the magnitude of the quake. Scientists have developed new methods of measuring magnitude based off the Richter scale in order to examine deep earthquakes and to use other types of seismographs. Earthquake magnitude can extend even into the negative number zone to describe extremely small ground motions. Furthermore, people don’t even notice the majority of earthquakes that occur; thus concluding that very minimal shaking can be considered an earthquake. Additionally, composition of the earth also affects the amount of shaking that occurs during an earthquake; for example, sand typically moves much more than solid rock.
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