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Answer:
If it happened before the largest one it's a foreshock. If it happened after, it's an aftershock. The largest is the mainshock.
HUHUHU Explain? I dunno
1. An earthquake cannot be identified as a foreshock until after a larger earthquake in the same area occurs.
2. An earthquake will be called an aftershock as long as the rate of earthquakes is higher than it was before the mainshock.
3. A mainshock is identified by its size, as the largest event in an earthquake sequence, whereas a foreshock is determined by its relative timing before the mainshock.
Answer:
If it happened before the largest one it's a foreshock. If it happened after, it's an aftershock. The largest is the mainshock.