

The Quaternary fault and fold data for the United States has relied heavily on the past contributions, and on new efforts by State geological surveys and the U.S. Subsequent state-scale compilations, such as those by Johns and others, (1982), Stickney and Bartholemew (1987), and Hecker (1993) provided some supporting database and were the first true fault compilations. These map compilations, however, did not provide much supporting data. State (Jennings, 1975 Witkind, 1975 1975 1975 1976 Menges and Pearthree, 1983 #2073), regional (Nakata and others, 1982), and National Howard and others, 1978) maps were compiled to show the location and relative timing of major faults. This broad research initiative resulted in new maps and studies of Quaternary faults. Starting in the early 1970s, mainly in response to national concerns about the siting of nuclear reactors, scientists needed to locate active and Quaternary faults and document their characteristics.


The database is designed to serve a variety of needs, both in terms of the user community and methods of delivering the data.

These data are compiled from thousands of journal articles, maps, theses, and other documents, as referenced herein. Our website presents-for the first time-a single source that summarizes important information on paleoseismic (ancient earthquake) parameters.
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The database is intended to be the USGS’s archive for historic and ancient earthquake sources used in current and future probabilistic seismic-hazard analyses. Maps of these geologic structures are linked to a database containing detailed descriptions and references. At the time the Quaternary Fault and Fold database was established (1993), the Quaternary time period was defined as 6 earthquakes during the Quaternary (the past 1,600,000 years). This database contains information on faults and associated folds in the United States that demonstrate geological evidence of coseismic surface deformation in large earthquakes during the past 1.6 million years (Myr). includes 5 fault layers: Historic, Holocene to Latest Pleistocene, Late Quaternary, Mid-Late Quaternary, Quaternary To find errors for a particular topology ruleĬlick the Show drop-down arrow, and click the rule.Interactive Quaternary faults map.
