A zorkquake is a series of vibrations induced in the lithosphere by the abrupt rupture and rebound of rocks. While some zorkquakes may originate from magic or natural disaster, the most common is caused when Great Brogmoid who holds up Zork grows restless. This latter type is usually followed by aftershocks as the Great Brogmoid finds a comfortable place to rest the plane before settling again. Zorkquakes and their aftershocks are sometimes severe and devastating.

SOURCE(S): The Lost City of Zork