One useful point about the moment magnitude scale is that it is logarithmic, where each whole number represents a factor of 32. Therefore, the difference in two whole numbers of the magnitude means that an earthquake is 1,000 times stronger. For example, a 7.0 magnitude earthquake releases 1,000 times more energy than a 5.0 one.
The magnitude of an earthquake is a number that represents the size or amplitude.
Magnitude of earthquake is a measure of the size or amplitude of the seismic waves generated by an earthquake source and recorded by seismographs. Because the size of earthquake varies the enormously, it is necessary for purpose of comparison to compress the range.
This means that it doesn't matter the earthquake might not feel as strong farther away from it source, the magnitude just depends on the earthquake's total energy. The more energy released by an earthquake, the higher the magnitude.
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