San Andreas fault
active fault in the earth's crust extending northwest from S California for about 600 miles (966 km)
Origin of San Andreas faultafter San Andreas valley, through which the fault runs: origin, originally Sp, San Andrés, Saint Andrew
San Andreas Fault
A major zone of fractures in the earth's crust extending along the coastline of California from the northwest part of the state to the Gulf of California. Movement of the tectonic plates along the fault has caused numerous tremors, including the devastating San Francisco earthquake of 1906.