Discussion
An earthquake of magnitude 6.0 releases energy E. The energy released by a magnitude 7.0 event is closest to
Answer: B
Correct answer: 32E
Energy rises by a factor of about \( 10^{1.5} \) per magnitude unit: \[ 10^{1.5} = 31.6 \approx 32. \] So a magnitude 7 releases roughly 32 times the energy of a magnitude 6, and a magnitude 8 about a thousand times. The factor of 10 that people often quote is the amplitude ratio, not the energy ratio, and confusing the two understates the difference badly.
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