Science Olympiad Dynamic Planet Practice Test

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Which scale is used to measure the amount of shaking from an earthquake?

Modified Mercalli Scale
Moment Magnitude Scale
Richter Scale
Seismic Intensity Scale

The correct answer is: Modified Mercalli Scale

The Modified Mercalli Scale measures the intensity of shaking and the effects of an earthquake as experienced at specific locations. Unlike other scales that focus on the energy released by an earthquake, the Modified Mercalli Scale is subjective and relies on observations of damage and the human experience. It ranges from I (not felt) to XII (total destruction), providing a qualitative assessment of how earthquakes impact people and structures. This personal experience aspect makes it distinct from the Moment Magnitude and Richter scales, which quantify the magnitude of the earthquake based on seismic waves. The Seismic Intensity Scale is similar to the Modified Mercalli Scale, but it is less commonly referenced and not as widely used for the general experience of shaking.