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It's the only place they can occur. Over a continuous, solid part of the tectonic plate, there are no earthquakes - if the plate shifts, it shifts as one whole unit - no earthquake (maybe an ominous rumble or quiver, but that's about it). At boundaries, shift causes one edge to collide with another. Something's got to give. One or the other plate has to move up, down, forward or back. Any of those are called an "earthquake".

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14y ago

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