Drawing inspiration from the movement of tectonic plates to cause a natural quake, you have figured out how to replicate the phenomenon far more effectively. With one strike to the ground, you can stagger those around you or knock them entirely off their feet. 

Cost: Two Rouse checks

System: By striking the ground with your fist or stomping your foot, you cause the ground around you to burst upwards. Make two Rouse checks, then make an unarmed attack challenge against all characters (including allies) within five steps of you using Strength + Brawl pool vs. their Dexterity + Athletics pool. On a successful challenge, your attack does one damage and inflicts the Staggered Condition. Critical wins from your attack also inflict the Prone Condition. Damage from Earth Shock is always normal and can never be converted to Aggravated. 

After all attacks are resolved, the Storyteller will determine the effects of this power on any inanimate objects or structures in the area of effect. The floor may collapse, furniture may break, and windows may shatter. For simplicity, the Storyteller may choose to have objects within five steps of you take one point of Structure damage.

Duration: N/A