Watch A simulation of the ShakeOut Scenario as described at shakeout.org/scenario. ShakeOut is an annual earthquake drill, always on the third Thursday of October. Learn more: shakeout.org
The 2008 Great Southern California ShakeOut was based on a potential magnitude 7.8 earthquake on the southern San Andreas Fault— approximately 5,000 times larger than the magnitude 5.4 earthquake that shook southern California on July 29, 2008. Its not a matter of if an earthquake of this size will happen—but when. And it is possible that it will happen in our lifetime.