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Here's a brief answer to a very involved topic. The Richter scale (not the only method of rating earthquakes) is commonly used. Generally, every increase in whole units represents a ten-fold increase in the amount of ground vibration of the event. A quake of 8.9 has 10 times more shaking than a quake of 7.9. It would have 100 times more shaking than a quake of magnitude 6.9, and 1,000 times more than a quake of 5.9.

Regarding the total energy output of the event at the epicenter (where the quake actually begins), there is roughly a 30-fold increase in energy for every whole unit increase in the Richter scale. So an 8.9 quake released 30 times more energy than a 7.9 quake, and 900 times (30X30) the energy output of a 6.9 quake. It would contain an unimaginable 27,000-fold output of a 5.9 quake. The Japan quake of March 2011 has been finally rated as a 9.0 quake, and many believe that this is near the upper limits of what an earthquake can ever register.

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