另一种理论认为其它动物在震前能感觉到人类察觉不到的弱震。

Another theory holds that other animals can sense weak shocks before an earthquake that are imperceptible to humans.

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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.

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震相识别已经有很多方法，但对于弱震相识别的难题尚未根本解决。

There are a lot of methods to identify seismic phases, but the identification of weak phases is not solved ultimately.

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