Geologic Trips, Bay Area Faults

San Andreas Lake

 

The trace of the 1906 San Francisco earthquake passes through this point on the abutment San Andreas Dam and then northwest through the San Andreas Lake toward the small peninsula (distant center). The San Andreas Dam is an earthfill embankment that is 720 feet long and was built across the valley that was formed by the San Andreas fault zone. The dam was displaced nine feet to the northwest during the earthquake, but did not fail.

 

It is this lake that gave its name to the San Andreas fault. In 1991 this monument was placed at the spot where the fault cut through the abutment for the dam.

Related Link

Geologic background: Bay Area Faults (pdf)

 

Exterior Websites

Assoc. of Bay Area Governments: Resilience Program

Stanford: San Andreas Lake and the San Francisco Bay Area

USGS: San Andreas Fault, San Andreas Fault System, Professional Paper 1515

Wikipedia: San Andreas Lake