In Central Oregon (the Bend Region) a big concern is that should a major event occur a lot of people from the western half of the state will try to evacuate here.
I lived just west of the Los Angeles area in the adjacent county during the 1994 Northridge quake. Our locality lost power for a day. There was no discernible movement of refugees out of Los Angeles into our area. When you think about it, how do you "flee" an earthquake... After the event. most people will try and patch up and rebuild, although U-Haul traditionally does great business in the weeks after a big shake - people moving to Kansas to avoid quakes. I have talked to ex-Floridians who have moved to SoCal to avoid hurricanes - talk about jumping out of the frying pan into the fire.