Originally Posted By: MDinana

B/c let's face it, the Sierra's are made by pushing land UP, if you look at the coastline (especially Central CA), you'll see cliffs. Not exactly the geography of a sinking area.

The western part of CA is not the same landmass as the continental US. The two landmasses happen to abut one another right now, rubbing against each other causing earthquakes... I believe the Sierra's are the CONUS landmass being pushed up.

In 200-300 years western CA will be several feet north of where it is now, with several impressive earthquakes in the history books as a result. Append several more zeros to that interval and from memory I think the belief is that the western part of CA moves offshore, looking like Baja CA, eventually splitting off entirely.

All the predictions have probably changed in the 30+ years since I last read a geography textbook, but I am quite certain of one point: by the time CA moves 15+ feet north, the history books will list some major earthquakes throughout CA.