Foreshocks are earthquakes which precede larger earthquakes in the same location.
前震是更大强度地震发生之前在同一位置发生的地震。
In California, about half of the biggest earthquakes were preceded by foreshocks other half were not.
在加利福尼亚州, 大约有一半的最大地震之前有前震。
Although the five foreshocks differed from each other in total magnitude, their waveforms were remarkably similar.
尽管这五次前震震级不同，然而它们的波形却显著相似。
Zipingpu has such a system. A reservoirtriggered earthquake should have more foreshocks than a natural earthquake.
水库诱发的地震应该比自然发生的地震有更多前震。
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