Thread: Sendai earthquake/tsunami [Another quake hits]
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Old 14-03-2011, 03:35 AM #3
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Actually, I'm not sure how they do define it. Whats the difference between an earthquake, a tremor and an aftershock?

I was thinking an earthquake happens and anything after is an aftershock, no matter how strong? A tremor is anything mild??? Milder? Beforehand??
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