Groundquake/Legends

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.

Natural occurrences of groundquakes
Groundquakes were common to Berchest, Shola, Riflor, Velusia, and many other planets.

In 43.5 ABY, groundquakes occurred on the planet Kessel.

Artificially created groundquakes
When Bao-Dur's Mass Shadow Generator was activated once again on Malachor V, it unleashed massive and devastating groundquakes that literally tore the planet apart.

The initial shot on Despayre from the first Death Star's superlaser triggered massive groundquakes and shifted entire tectonic plates.

Appearances

 * ''Star Wars: Knights of the Old Republic II: The Sith Lords
 * Star Wars: The Old Republic
 * Lando Calrissian and the Mindharp of Sharu
 * Death Star
 * Allegiance
 * Star Wars: Force Commander
 * Mission from Mount Yoda
 * Luke Skywalker and the Shadows of Mindor
 * The Unifying Force
 * Mission from Mount Yoda
 * Luke Skywalker and the Shadows of Mindor
 * The Unifying Force