Quake

Quake is a Ultimate-class Attack Command exclusive to Terra in Kingdom Hearts Birth by Sleep and to Data Sora in Kingdom Hearts Re:coded.

In Kingdom Hearts Birth by Sleep, Terra thrusts his Keyblade into the air as he commands a small portion of earth around him to violently jut up, heavily damaging enemies in a wide area. It takes up two slots in the Command Deck. It has a maximum level of 5, and its reload time is 20 seconds.

In Kingdom Hearts Re:coded, Data Sora jumps up into the air and then slams down the ground, damaging nearby ground enemies. It takes up 15% of memory.

Kingdom Hearts Birth by Sleep

 * Brutal Blast (LVL 4) and Brutal Blast (LVL 4)-30%
 * Brutal Blast (LVL 4) and Magnega (LVL 4)-90%
 * Mine Square (LVL 3) and Binding Strike (LVL 3)-30%
 * Stun Edge (LVL 3) and Mine Shield (LVL 3)-30%
 * Zero Graviga (LVL 4) and Brutal Blast (LVL 4)-90%

Kingdom Hearts Re:coded

 * Zantetsuken + Cyclone

Kingdom Hearts Birth by Sleep

 * It can be bought after obtaining for 2,500 Munny.

Etymology
Quake is a recurring Black Magic spell in the Final Fantasy series. It usually deals earth-elemental damage to one or all opponents, and may not affect flying enemies, depending on the game.