User blog comment:Bovell/Lots of new Battlefield 3 details via Twitter, DreamHack festival, PSM3, and interview/@comment-2224289-20110626124647/@comment-24476373-20110628224152

Mebbe that's how the earthquake happened at the end of the Fault line gameplay- the earthquake gun was causing the tremors, and the gun finally jumpstarted the fault line, causing it to move, whick resulted in the earthquake that toppled the skyscraper.