Discussion
The Richter scale measures
Answer: A
Correct answer: the amplitude of the largest seismic wave recorded
Richter defined his local magnitude from the logarithm of the maximum trace amplitude on a standard instrument, corrected for distance. It is therefore an amplitude measure, not an energy or a rupture-area measure. Moment magnitude, which is derived from the fault area and the slip, was introduced later precisely because the amplitude definition breaks down for the largest events.
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