...*hours* before they happen. Enough time to remove fragile objects from shelves, to get to a better location.
Earthquakes appear to start about two hours before we feel anything...but GPS units can detect that early fault displacement. It wouldn't be enough time to, say, evacuate San Francisco.
But it would be enough time to turn off gas appliances, reducing the risk of fire. Enough time to, as mentioned, secure fragile objects and take pictures off the walls. Enough time to secure your booze (which can also start a fire in certain circumstances).
And more than enough time to get away from windows, heavy objects, etc.
We just need to do a bit more research so we can reliably detect the pattern.
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