Discussion
A smaller earthquake preceding a larger one on the same fault is called a
Answer: A
Correct answer: foreshock
A foreshock is a smaller event preceding a larger one on the same structure, and it can only be identified as such after the larger event has happened - which is exactly why foreshocks have proved so disappointing as a prediction tool. Aftershocks follow the mainshock and are far more numerous, and microseisms are continuous background vibration from ocean waves and wind.
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