The earth quake happens when the pressure between to tectonic plates becomes to great and it is released suddenly one plate is subducted the other is abducted. The fissures can and are (technically) a very long way away from where the tectonic plate moved.
We live in a 3 dimensional world and the shift in the plate happens under our feet, a very long distance under our feet. The average depth is 10 kilometers or 6 miles.
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