# The Naked Scientists Forum

### Author Topic: How much more powerful is an earthquake of magnitude 7 than a Richter scale 5?  (Read 17418 times)

#### trigger

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##### How much more powerful is an earthquake of magnitude 7 than a Richter scale 5?
« on: 24/11/2008 11:59:16 »
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 »

#### dentstudent

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• FOGger to the unsuspecting
##### Re: How much more powerful is an earthquake of magnitude 7 than a Richter scale 5?
« Reply #1 on: 24/11/2008 12:02:10 »
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 »

#### RD

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##### Re: How much more powerful is an earthquake of magnitude 7 than a Richter scale 5?
« Reply #2 on: 24/11/2008 12:05:57 »
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).

#### trigger

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##### Re: How much more powerful is an earthquake of magnitude 7 than a Richter scale 5?
« Reply #3 on: 24/11/2008 12:07:31 »
Thank you so much for your help. I hope i can pick your brains again in the future

#### The Naked Scientists Forum

##### Re: How much more powerful is an earthquake of magnitude 7 than a Richter scale 5?
« Reply #3 on: 24/11/2008 12:07:31 »

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