Quaternary faults responsible for significant (magnitude 6 and larger) earthquakes in the last 1,600,000 years.
This map layer contains locations and information on faults and associated folds, in the United States, that are believed to be sources of significant earthquakes (those of magnitude 6 or greater) during the past 1,600,000 years.

A fault is a fracture or zone of fractures in the Earth's crust, along which the blocks of crust have moved relative to one another; an earthquake is the result of such a movement. Folds are curves or bends in rock layers. The Quaternary Faults and Fold database contains information compiled by the Earthquake Hazards Program of the U.S. Geological Survey (USGS). The database describes faults and associated folds in the United States that are believed to be sources of earthquakes, greater than magnitude 6, in the past 1,600,000 years, and is intended to be an archive of historical (less than 150 years) and ancient earthquake sources.

These data are intended for geographic display and analysis at the national level, and for large regional areas.  The data should be displayed and analyzed at scales appropriate for 1:250,000-scale data.
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