It's one thing to live somewhere that has moderate earthquakes on a regular basis. But to live right on top of a fault that's destroyed the entire city of San Francisco once before and is expected to cause another cataclysmic, city-destroying quake at some unknown time in the future? I'm too risk-averse for that. (And I'm a little relieved that my cousin who used to live in SF has moved to Maryland.)
Doesn't your sister still live in the Puget Sound, or had she moved?
We have volcanoes and earthquakes.
And a quick online search shows that Maryland has been hit by forty hurricanes since records started being kept.