Earth
There is no way to spot big earthquakes ahead of time
Large earthquakes look just like small ones when they start out, so early warning systems have no clues to help figure out if a quake is going to be huge
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Large earthquakes look just like small ones when they start out, so early warning systems have no clues to help figure out if a quake is going to be huge
A commercial device that uses quantum technology to detect subtle differences in gravity, should be able to detect coal, oil or pipes underground