Discussion
If an earthquake 'A' has a Richter magnitude of 7 and 'B' that of 6. Then :
Answer: A
The keyed answer is that A is 10 times more intense than B.
The Richter magnitude is the logarithm to base 10 of the maximum trace amplitude, corrected for distance. A difference of one unit of magnitude therefore means a tenfold difference in recorded ground-motion amplitude, which is the sense in which the paper uses 'intense'.
The energy released grows faster, by a factor of about \(10^{1.5}\), roughly 32, per unit of magnitude, but no option gives that figure. 28 and 5 times correspond to no standard rule, and 1000 times is the energy ratio for two units of magnitude, not one.
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