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they know by underground sensors that tell them that earthquakes are coming to a certain or not certain area.

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Sort of! The point of maximum effect on the land surface is the earthquake's Epicentre, and the unfortunate residents can tell you where that was. The origin of the 'quake, i.e. the centre of the action that caused the tremors, is its Focus, and is usually deep below ground. The earthquake is timed as it passes seismographs around the world, and because the speed of the vibration through the planet is known, the location of the focus can be calculated from triangulating distances, which are speed/time. Obviously it won't be that simple, but that is the general principle.

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