Quaternary Fault and Fold Database of the United States

NOTE: This database is the source for faults used in the National Seismic Hazard Maps, however, the spatial representation of the faults in the hazard maps was simplified and critical fault parameters were assigned to produce the hazard maps.

Citation information - when using these data, please provide proper acknowledgment.

offset in San Andreas fault

San Andreas fault zone, Carrizo Plains, central California. Photo by R.E. Wallace, USGS

Fault Primers