An online map of faults (Quaternary Fault and Fold Database of the United States) that includes California is in the Faults section of the Earthquake Hazards Program website. Choose the Interactive Fault Map, or download KML files and GIS shapefiles from the links on the page.
USGS hazard maps, data, and tools for California and other parts of the United States are in the Seismic Hazard Maps and Site-Specific Data section of the Earthquake Hazards Program website.
The California Geological Survey has a number of Geologic Maps and Data including:
- Geologic Map of California
- Alquist-Priolo Earthquake Fault Zone Maps
- Earthquake Hazards Zone Application (EQ Zapp)
- Landslide Maps
- Watershed Maps
- Topographic Maps