Description: Potentially hazardous faults are those that have been identified by the U.S. Geological Survey (USGS) as having moved in the last 1.6 million years (USGS Open-File Report 03-095). These faults may be the source of future damaging earthquakes and severe ground disruption is possible. Fault lines were mapped largely from low-resolution geologic or topical maps, resulting in very poor location accuracy. DOGAMI reviewed the USGS database along with the Oregon Geologic Data Compilation (OGDC v5), which contains the best available digital geologic mapping for Oregon and is generally more detailed and accurate than the USGS sources. Where a positive correlation could be made, DOGAMI substituted the more accurate fault line from OGDC for the original USGS line, while retaining the USGS data for each fault. Where a positive correlation could not be made, DOGAMI retained the original USGS fault line. <br><br>(DOGAMI)