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Geologic Hazard Maps

Geologic hazards maps show areas that may be subject to the effects of earthquakes, landslides, debris flows, rock falls, poor soil conditions, radon, or floods. The main purpose of geologic hazards maps is to identify where site-specific geologic hazards evaluations are needed to assess hazards and recommend risk-reduction measures prior to development.

Quaternary Fault and Fold Database of the United States (outside link)
Located on USGS website. Contains information on faults and associated folds in the United States that are believed to be sources of M>6 earthquakes during the Quaternary (the past 1,600,000 years). Maps of these geologic structures are linked to detailed descriptions and references.

Move cursor over location map or statewide map name on left to preview map image on right. Click on location or map name to download pdf map.
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 Public Information Series pdf files:
(most are page-size maps)
Dept of Natural Resources Dept of Natural Resources