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Zones of required investigation for possible earthquake faulting, landslides, and liquefaction are delineated and distributed to cities, counties, and state construction agencies to help identify where higher building standards may be necessary for safe development. 

You can access all of CGS's Regulatory Maps, Reports and GIS data using CGS's Information Warehouse.

Landers Earthquake

Alquist-Priolo Earthquake Fault Zones prevent buildings for human occupancy from being constructed upon active faults. Statutes require that cities and counties use these zones as part of their construction permitting process.

Liquefaction at King Harbor, Redondo Beach, Northridge Earthquake, 1994

Liquefaction Zones identify where the stability of foundation soils must be investigated, and countermeasures undertaken in the design and construction of buildings for human occupancy. Statutes require that cities and counties use these zones as part of their construction permitting process.

Landslide in Pacific Pallisades, Northridge Earthquake, 1994

Landslide Zones identify where the stability of hillslopes must be evaluated, and countermeasures undertaken in the design and construction of buildings for human occupancy. Statutes require that cities and counties use these zones as part of their construction permitting process.

 

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