Are there warning signs before an earthquake?

Question

Looking for possible signs. Reports of "earthquake lights" can be seen. People have seen strange lights from the ground or hovering in the air before an earthquake. Rocks that are under extreme stress may emit earthquake lights, even though they are not fully understood.

Hagrid P Hazard · Accepted Answer

Looking for possible signs. Reports of "earthquake lights" can be seen. People have seen strange lights from the ground or hovering in the air before an earthquake. Rocks that are under extreme stress may emit earthquake lights, even though they are not fully understood.

Are there warning signs before an earthquake?

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