The San Andreas fault, in heavy red, slices through key mountain passes including the San Gorgonio Pass and the Cajon Pass. Where electric lines cross the San Andreas faultWhere electrical transmission lines cross the San Andreas fault, according to a 2008 report. of Governments:Why are we so concerned about the San Andreas fault, when other faults are closer to cities? Even the Hayward fault in the San Francisco Bay Area could be set off by an earthquake on the southern San Andreas fault, Jones said. Los Angeles is slowly moving closer to San Francisco as a result of earthquake activity on the San Andreas fault.

Source: Los Angeles Times June 13, 2017 13:50 UTC