Most earthquakes occur on pre- existing faults. With very few known exceptions, epicenters of large earthquakes are close to the margins of tectonic plates, because it takes large strains — the relative motions of plates—to produce large earthquakes.
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Most earthquakes occur on pre- existing faults. With very few known exceptions, epicenters of large earthquakes are close to the margins of tectonic plates, because it takes large strains — the relative motions of plates—to produce large earthquakes.