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How the power of earthquake estimated? At what strength it becomes destructive?

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1. The power of earthquake is expressed in terms of magnitude on scale called Richter scale. 

2. The destructive earthquakes have magnitudes higher than about 7 on richter scale. 

3. Like many other scales, richter scale is not linear. It means that earthquake of magnitude 6 does not have the twice the destructive energy of an earthquake magnitude 3. 

4. Infact, an increase of 2 in magnitude means 1000 times more destructive energy. 

5. For example, an earthquake of magnitude 6 has thousand times more energy than earthquake of magnitude 4.

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