It measures the intensity of an earthquake which can be determined by its destruction effect. The Ritcher scale on the other hand mostly measures the energy of an earthquake. The Mercalli scale ranges from I (no destruction) to XII (Total destruction).
Earthquakes occurs due to the sudden trembling of the earth. These releases energy due to the propagation of seismic waves in the interior of the earth. These earthquake can cause great damages depending upon the intensity and magnitude of the earthquake.
The Mercalli scale was invented by Giuseppe Mercalli, in the year 1902. This scale measures the intensity of an earthquake. This intensity is marked by the amount of damage it causes in a particular area. It does not determine the magnitude of the earthquake. These scale ranges from I to XII, where I depicts a earthquake of least intensity, and XII depicts an earthquake of maximum intensity and it is very destructive.
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