 Modified Mercalli intensity scale

The Modified Mercalli intensity scale (MM or MMI), developed from Giuseppe Mercalli's Mercalli intensity scale of 1902, is a seismic intensity scale used for measuring the "intensity of shaking" produced by an earthquake.It measures the "effects" of an earthquake "at a given location", distinguished from the earthquake's inherent "force" or "strength" as measured by seismic magnitude scales (such as the "" magnitude usually reported for an earthquake).