The Alquist-Priolo Earthquake Fault Zoning (AP) Act was passed into law following the destructive February 9, 1971 Mw 6.6 San Fernando earthquake. The AP Act provides a mechanism for reducing losses from surface fault rupture on a statewide basis. The intent of the AP Act is to ensure public safety by prohibiting the siting of most structures for human occupancy across traces of active faults that constitute a potential hazard to structures from surface faulting or fault creep.
Thirteen proposed new and revised Preliminary Alquist-Priolo Earthquake Fault Zone maps Released March 7, 2012. Areas covered include Alameda, Imperial, Riverside, San Diego, and Ventura counties. Click here to view or download the proposed new and revised maps.