Faults shown on this map were taken from Roy M. Breckenridge, Reed S. Lewis, Guy W. Adema, and Daniel W. Weisz, Miocene and younger faults in Idaho, 2003, Idaho Geological Survey Map 8. This map was released as an online interactive database in 2004. Click here to view this map. The US Geological Survey maintains a similar online database of faults and associated folds in the United States that are believed to be sources of M>6 earthquakes during the Quaternary. Click here to see the USGS database.