Solved cryptogram

Each whole step up an earthquake scale means a shaking about ten times as large as the last.

Earth Science Facts, sourced to U.S. Geological Survey.

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What it means

The scale is logarithmic, so the numbers are much further apart than they look. A step of one multiplies the ground motion tenfold and the energy released by roughly thirty two times. That is why a magnitude six and a magnitude eight are not neighbors on a list of similar events: the second releases about a thousand times the energy of the first.

The claim comes from U.S. Geological Survey.

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