When a fault slips and the rock units on either side return to their original shape by generating vibrations, it is called a. rupture formation. b. elastic deformation. c. a foreshock. d. elastic rebound?

The answer is b. elastic deformation
In geologically active areas, stress causes rocks to deform or stretch out. But when the stress  ends, the faults return back to normal through elastic deformation. They regain their original shape.

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