A fault line is formed when there is a planar fracture in the earth. Two large plates colliding or sliding across each other, in any direction, creates a line of fracture and tension along the rocks. This fracture is called a fault. An earthquake results from a rapid movement or slippage between two plates. In which case seismic activity spreads in all directions.
An example is the San Andreas Fault in California where the Pacific and North American Plates are sliding past each other. There is no such thing as an earthquake fault. Earthquakes do occur most often at fault lines where two rigid and large plates, usually in the crust of the Earth, collide or slide over each other. But the two, earthquakes and fault lines are separate but correlated concepts.
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