No he may not actually be an earthbender but his moves sure are reminiscent of Avatar: The Last Airbender. Tremor is the newest addition to Mortal Kombat X, and his powers are the ability to summon and move rocks (and lava) to help damage the opposition. You can change the color of the rocks covering his body from default grey to a seemingly kryptonite green, fire lava, or gold. Tremor will become available on July 21, 2015 as a part of the Kombat Pack and separately on July 28, 2015.
Tremor first appeared in Mortal Kombat: Special Forces in 2000 but this marks his first playable appearance. The earth-powers could be due to either his hands being made entirely of rock or just covered in it. Unfortunately his name does not appear to be inspired from the 1990 Kevin Bacon movie either, as no underground creatures appeared to help him in the fatalities shown. You can watch said fatalities and some bone crushing moves in the trailer below.