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What is the Mercalli scale?

April 26, 2017mercalli scale

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What is the Mercalli scale?

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10 Posted

The mercalli scale also known as the Modified Mercalli Intensity (MMI) scale is a measure of the ground shaking from earthquakes. It is based on how people perceive earthquake shaking and/or the damage caused by an earthquake. Modified Mercalli Intensity is measured at individual locations so one earthquake can have many different measures of MMI. MMI is measured on a scale of 1 to 12 (actually Roman numerals) with 1 corresponding to the slightest shaking and 12 reflecting the strongest earthquake. MMI is not the same as earthquake magnitude which is a single measure of the amount of energy released by an earthquake.