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Deals damage and has a critical hit rate one stage higher than normal. Assuming there are no other critical hit modifiers in play, this move has a 1/8 chance to get a critical hit instead of a 1/16 chance.
Not a common sight in the competitive scene. Note that it's not because it's a bad move, and actually it's a pretty decent one on paper, as it's a strong Ground-type attack with good accuracy and a high chance to land a critical hit. Unfortunately the merits end here; it has an average Base Power and is obscenely badly distributed, with Fearow and Rapidash being the only notable Pokemon that receive the move.
Earthquake is a more powerful option with perfect accuracy and much better distribution.