Groundquakes were natural phenomena on rocky planets. As their internal cores spun, they created rift zones, faults, and plates on the surface as a result of convection currents. When two plates moved past each other, or slid past or under each other, the immense friction would result in a groundquake and anything caught in the shock wave would be damaged or destroyed from shaking. Scales for measuring groundquakes included standard magnitude and the Imperial quake scale. A magnitude 77.88 groundquake was mentioned as being fairly major.
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