DOC Maps: California Geological Survey

The California Geological Survey (CGS) is dedicated to providing scientific products and services about the state’s geology, seismology, and mineral resources that affect the health, safety, and business interests of the people of California.

  • Regulatory Zones: Alquist-Priolo and Seismic Hazard zones require that additional study be conducted prior to certain types of construction in areas with established risk for fault surface rupture and earthquake induced landslides or liquefaction.
  • Geologic Maps: Geologic maps are the starting point for evaluation of geologic hazards and resources by many of CGS and others’s other products. They describe the underlying geology, allowing users to derive insight into the geologic and geomorphic nature of the mapped area.
  • Mineral Resource Mapping: CGS produces maps identifying mineral resource zones with potential for the production of geologic resources such as metals, minerals, and construction aggregate important to the state’s economy.
  • Geologic Hazards: The California Geologic Survey identifies locations subject to geologic or topographic hazards such as earthquake shaking hazards, related economic losses, landslides, tsunamis, and hazardous minerals (asbestos, mercury, and radon).

Quick Access

Interactive Web Maps

Scroll through the available web maps at the bottom. Click on the large picture (or the Open Map link) to open the web map in a new tab.

Data Viewer

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California Geological Survey Data

  • [AGOL] indicates that the Department of Conservation's official ArcGIS Online account hosts the data using cloud-based services.