Discussion
Consider the following statements about magnitude.
1. An earthquake has one magnitude.
2. Magnitude depends on the distance of the recording station.
3. The magnitude scale is logarithmic.
Which of the statements are correct?
Answer: D
Correct answer: 1 and 3 only
Statements 1 and 3 are correct: an earthquake has one magnitude, since magnitude describes the source, and the scale is logarithmic. Statement 2 confuses magnitude with intensity - the distance correction is applied precisely so that stations at different distances arrive at the same magnitude, and a systematic dependence on distance would mean the correction was wrong.
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