How many m5 earthquakes would it take to equal the energy release of an m6? an m7? m8?

m=magnitude

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Essentially, each successive magnitude is 33 times larger than the last. That means a magnitude-8.0 earthquake is 33 times stronger than a 7.0, and a magnitude-9.0 earthquake is 1,089 (33 x 33) times more powerful than a 7.0 — the energy ramps up fast.

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 107-5 = 102 = 100, and that gives you the strength of the stronger earthquake.

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explanation:

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