View of geologists pointing to fault in a trench dug across one of the ruptures from the 2014 South Napa earthquake. From front to rear: Alexandra Pickering, Suzanne Hecker, Aaron Page (all USGS). Trench located approximately 3 miles NW of downtown Napa, CA.
Where can I find a fault map of the United States? Is one available in GIS format?
An online map of United States Quaternary faults (faults active in the last 1.6 million years which places them within the Quaternary Period) is available via the Quaternary Fault and Fold Database. There is an interactive map application to view the faults online and a separate database search function. KML (Google Earth-type) files and GIS shape files are also available for download from the site. The interactive map provides detailed reports for each fault by placing the cursor over the fault and clicking to bring up a link to the information.
Related
What is a fault and what are the different types?
What is the relationship between faults and earthquakes? What happens to a fault when an earthquake occurs?
What is a "Quaternary" fault?
How do I find the nearest fault to a property or specific location?
How do I find fault or hazard maps for California?
Why are there no faults in the Great Valley of central California?
Why are there so many earthquakes and faults in the Western United States?
Why are there so many faults in the Quaternary Faults Database with the same name?

View of geologists pointing to fault in a trench dug across one of the ruptures from the 2014 South Napa earthquake. From front to rear: Alexandra Pickering, Suzanne Hecker, Aaron Page (all USGS). Trench located approximately 3 miles NW of downtown Napa, CA.
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Quaternary fault and fold database of the United States
Quaternary fault map of the Basin and Range and Rio Grande Rift provinces, Western United States
Related
What is a fault and what are the different types?
What is the relationship between faults and earthquakes? What happens to a fault when an earthquake occurs?
What is a "Quaternary" fault?
How do I find the nearest fault to a property or specific location?
How do I find fault or hazard maps for California?
Why are there no faults in the Great Valley of central California?
Why are there so many earthquakes and faults in the Western United States?
Why are there so many faults in the Quaternary Faults Database with the same name?

View of geologists pointing to fault in a trench dug across one of the ruptures from the 2014 South Napa earthquake. From front to rear: Alexandra Pickering, Suzanne Hecker, Aaron Page (all USGS). Trench located approximately 3 miles NW of downtown Napa, CA.
View of geologists pointing to fault in a trench dug across one of the ruptures from the 2014 South Napa earthquake. From front to rear: Alexandra Pickering, Suzanne Hecker, Aaron Page (all USGS). Trench located approximately 3 miles NW of downtown Napa, CA.