I think the small quakes that have been occurring in the Nevada/Arizona/South-western corner of Cali should have been a pretty clear sign that something was happening.

I've been saying this for awhile, but Cali is going to get hit by a quake much like the '89 quake which gave me nightmares for years. I was six when it happened and my family had glued themselves to the tv. I still shiver when I pass under an overpass...
Thank God I'm in Texas...