It moves about 30 millimeters per year and can cause devastating earthquakes

This plate boundary still exists today,and moves about 30 millimeters per year capable of causing devastating earthquakes.The San Andreas also pulls apart western North America across a wide rift zone.This extensional region is called the Basin and Range Province,
and through uplift and erosion,is responsible for exposing the once deep granite of Yosemite and the Sierra Nevada.