The movie is not factually based, that is for sure. But it is a movie and should be taken with a grain of salt. That being said:
First off, an earthquake from San Diego to Seattle is impossible. Sure the North American and Pacific plate boundary extends that length, but it is really not the same earthquake fault all the way though. The San Andreas goes from the Salton Sea to off the coast near Pt. Reyes, north of San Fran. On top of that, the San Andreas is a strike slip fault (lateral movement), while the plate boundary near the Washington area is a subduction zone (one plate going under the other). I don't see how they could coincide in a big quake. By the way the largest quake in recorded history is in the mid 9's in Chile.
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