[link to s1206.photobucket.com]

Here is dangerous places and earthquake pressure flow below USA, have three main dangerous "line"

One "line" you can see on images, other is San Andreas fault line, Third "line" is areas off West Coast of North America to Alaska ..

This collide in areas of N Ca, off Cost Oregon, British CO probably in ocean ..

In other picture you can see most dangerous area for biggest earthquake, that's how I see things ..