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The energy released during an earthquake (termed it's strength or more correctly it's magnitude) is measured using the Moment Magnitude scale, the Richter scale is commonly quoted in the press, but is no longer in common usage by seismologists.

The intensity (based on the perceived shaking as well as measured ground accelerations from seismometers) is measured or quantified using the Modified Mercalli scale.

Neither of these scales have units, however the Moment Magnitude scale value is derived from the seismic moment which has the units of dyne centimetres.

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15y ago

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