There are many scales for measuring earthquakes?

There are two parameters to characterize an earthquake: magnitude and intensity. The magnitude is a measure of its strength in relation to the energy released and is calculated by measuring the maximum amplitude of seismic waves.

In 1935 the U.S. seismologists Charles Richter devised the logarithmic scale of magnitude that bears his name.

It has no upper limit, and an increase of one point implies that the magnitude of the earthquake increases tenfold. The most violent are over 7. Earlier, the Italian-Giu Sepp Mercalli had created a scale of 1 to 12 to measure the intensity of an earthquake, based on observation of its effects-that is subjective.