This is Amazing - Earthquake Warnings in Mexico

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While we cannot warn of an earthquake in the sense of letting people know before the ground begins shaking near the epicenter (origin point) of a quake, if there is a dedicated network of seismographs people away from the center can be warned.

They have such a network in Mexico (we do not have one in the United States). Here is what happened during the recent quake after the warnings went out. The story is so well done, I would prefer for you to go to it directly.

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