How much more powerful is an earthquake of magnitude 7 than a Richter scale 5?

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Offline trigger

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Hi all, can anyone please tell me:  How many times greater is the maximum ground motion of a magnitude 7 earthquake compared with that of a magnitude 5 earthquake?

Many thanks trigger.
« Last Edit: 01/01/2009 04:18:41 by chris »

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Offline dentstudent

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I think I'm right in saying that it's a log scale, and so a 6 is 10 times stronger than a 5, and a 7 is 10 times stronger than a 6; therefore a 7 is 100 times stronger than a 5.

As ever, Wiki has some good stuff....

http://en.wikipedia.org/wiki/Richter_magnitude_scale
« Last Edit: 24/11/2008 12:03:41 by dentstudent »

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Offline RD

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The Richter scale is a logarithmic scale (base 10),
 so the amplitude of the motion of a 7 is 100 times the amplitude of a 5   (7-5=2, 102= 100).

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Offline trigger

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Thank you so much for your help. I hope i can pick your brains again in the future