Discussion
An earthquake is reported as magnitude 6.5 at a station 200 km away and magnitude 6.5 at a station 800 km away. This shows that
Answer: A
Correct answer: magnitude is independent of distance, as expected
This is the scale working as designed. Magnitude formulae include a distance correction precisely so that stations at any distance arrive at the same value for the same source, and close agreement between a near and a far station is a check that the analysis is sound. It is intensity, not magnitude, that falls off with distance.
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