Many scientists estimate that there is enough tension built up along some locked California faults, that when they do finally slip, the earthquake will be extremely powerful. The Hayward Fault particularly concerns these scientists because it runs under heavily populated areas in and around Los Angeles. (You know little out of the way places like Anaheim.)
The notion that part of California will break off was likely inspired by the San Andreas fault. After all, since the fault goes right through California, one part of the state is on the Pacific plate and one is on the North American plate. If those plates are moving in different directions, it make sense that the two pieces of California will move in different directions too.
And this is indeed the case. But, even in a massive shift along the fault, the plates travel an incredibly short distance -- a matter of feet in the most extreme shifts. The tension cannot build up to the point that one entire mass of land will shift many miles in relation to another one, so you will not see any sizable piece of land breaking away from another. Instead, the pieces of land will move away from each other very slowly, taking millions of years to make large scale changes. One end of California may slowly drift so that it is eventually under water, but this can hardly be construed as "sinking into the ocean."
Heck Yeah! All that land between Tucson in Phoenix is going to waste as of now... I'd put it there!
Problem with that is that easily two-thirds of the open land in AZ is either Federal land, or belongs to sovereign indian nations.
Nevada is even worse, probably 70-80% of the state belongs to the government or is otherwise set aside. Remember, that's why they tested nuclear bombs there....!!!
"Conservatives are not necessarily stupid, but most stupid people are conservative." - John Stuart Mill
"We cannot defend freedom abroad by deserting it at home." - Edward R. Murrow
"It's far easier to fight for your principles than it is to live up to them." - Adelai Stephenson
Reason for the Season? Tilt of the planet's axis. Oh, you meant the holiday season? That's easy - Feast of Saturnalia. Disagree? That's nice.