Earthuake intensite in terms of I0

Incharge1976

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Mar 20, 2010
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I'm having some problems with this question and was wondering if someone could help me out.

On December 26, 2004, the third largest earthquake ever recorded struck in the Indian Ocean with a magnitude of 9.1 on the Richter Scale. Express the reading in terms of I0.

I believe the way to set it up is 9.1 = log I/Io. Am I on the right track?
 
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