”USGS: Understanding plate motions”. http://pubs.usgs.gov/gip/dynamic/understanding.html. Läst 1 maj 2009. ”the Pacific Plate has been grinding horizontally past the North American Plate for 10 million years, at an average rate of about 5 cm/yr. Land on the west side of the fault zone (on the Pacific Plate) is moving in a northwesterly direction relative to the land on the east side of the fault zone”