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How much stronger is a magnitude 7 earthquake than a magnitude 5 earthquake?

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The magnitude 7 earthquake is 100 times as strong as the magnitude 5 earthquake. The 100 comes from the increase in the scale from 5 to 7, which is an increase of 2, so you multiply the strength of the weaker earthquake by 10 7 - 5 = 10 2 = 100, and that gives you the strength of the stronger earthquake.
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