Tsunami

Source tsunami

The wave increases to 20 feet wide per caster level and 3 feet tall per caster level. The damage dealt to those struck by the wave increases to 12d6 points of bludgeoning damage. Add your tier to the wave's special combat maneuver check. The damage dealt to those that fail to escape the wave increases to 6d8 points of bludgeoning damage.

Augmented (5th): If you expend three uses of mythic power, you create a truly monstrous wave. The wave increases to 20 feet deep, 20 feet wide per caster level, and 5 feet tall per caster level. The duration of the effect increases to 10 rounds, and the speed of the wave increases to 120 feet per round on the surface of the water and 60 feet per round on land or underwater.