这种现象曾经让地震学家们感到很困惑，因为一般面波过去数小时之后微震才会发生。
The phenomena have rattled seismologists for sometime, as the microquakes can often occur hours after the surface waves have past.
3到5级被称为弱震或微震；5到7级称为中强震；7到8级被称为大地震；8级及以上被称为特大、超强地震。
A quake measuring 3 to 5 is considered minor or light; 5 to 7 is moderate to strong; 7 to 8 is major; and 8 or more is great.
智利断层活动产生的地震波环绕地球数圈之后又袭击了加利福尼亚，触发了加利福尼亚中部的微震。
The seismic waves released during the Chilean fault movement traveled around the world several times and triggered microquakes in central California.
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