Discussion
The return period of an earthquake at a site is the
Answer: C
Correct answer: average interval between events of a given size
Return period is a long-term average, obtained from the historical and geological record: if events of magnitude 7 have occurred on average every 250 years, that is the return period. It is emphatically not a countdown - an earthquake is no less likely the year after one occurs than the year before the average interval is up.
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