GeologicalFault : public <<Feature>> class
Created: 4/13/2007 4:47:28 PM
Modified: 9/25/2007 10:23:28 AM
Project:
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<p>This map layer contains locations and information on faults and associated folds, in the United States, that are believed to be sources of<br/></p><p>significant earthquakes (those of magnitude 6 or greater) during the past<br/></p><p>1,600,000 years.<br/></p><p><br/></p><p>These data are intended for geographic display and analysis at the<br/></p><p>national level, and for large regional areas.  The data should be<br/></p><p>displayed and analyzed at scales appropriate for 1:250,000-scale data.<br/></p><p>No responsibility is assumed by the National Atlas of the United States<br/></p><p>in the use of these data.<br/></p><p><br/></p><p>The most up-to-date version of this data set as well as detailed<br/></p><p>descriptions and references for each fault are available through the<br/></p><p>online Quaternary Fault and Fold Database of the United States, at<br/></p><p><http://earthquake.usgs.gov/regional/qfaults/>.  In addition, in the<br/></p><p>Earthquake Hazards Program Quaternary Faults and Fold Database viewer <http://gldims.cr.usgs.gov/qfault/viewer.htm>, and in the National Atlas Map Maker <http://nationalatlas.gov/natlas/Natlasstart.asp>, the geologic<br/></p><p>structures are linked to the database.  The Quaternary Fault and Fold<br/></p><p>Database of the United States is intended to be the USGS archive for<br/></p><p>historic and ancient earthquake sources used in current and future<br/></p><p>probabilistic seismic-hazard analyses.  The database summarizes important information on paleoseismic (ancient earthquake) parameters, compiled from thousands of journal articles, maps, theses, and other documents.  It includes information on geographic, geologic, and paleoseismic parameters that are deemed critical to making geologic-based assessments of seismic hazards.  In addition, it provides narrative comments that clarify, justify, or expound upon these parameters.<br/></p><p>Links to graphics describing the data <br/></p><p>Viewer for the Quaternary Fault and Fold Database. (Online viewer): <http://gldims.cr.usgs.gov/qfault/viewer.htm> <br/></p>
Attribute Details
public LengthMeasure
  GeologicalFaultLengthMeasure
Range:0 to 1
Notes: Length of the fault
public Integer
  GeologicalFaultCodeNumeric
Range:0 to 1
Notes: A 3-digit code used for symbolizing faults.  Each digit has a particular meaning:<br />First digit: fault visibility code: 1 = Exposed>2 = Concealed>3 = Inferred<br />Second digit: fault age code:<br />1 = Historic; referenced in dated recorded history, generally < 150    years<br />2 = Holocene <15,000 years<br />3 = Late Quaternary < 130,000 years<br />4 = Mid to late Quaternary < 750,000 years<br />5 = Quaternary < 1,600,000 years<br />6 = Class B; fault structures of questionable seismogenic origin that may be older than the Quaternary<br />Third digit: fault slip rate code: <br />1 = > 5 mm/year<br />2 = 1 - 5 mm/year<br />3 = 0.2 ? 1 mm/year<br />4 = < 0.2 mm/year<br />Definition Source: National Atlas of the United States
public Text
  GeologicalFaultNumText
Notes: The fault index number, which is linked to the online fault database.
public Text
  GeologicalFaultSlipText
Notes: A four-character code defining the fault type and slip direction.  Thefirst two characters describe the fault type:<br />N_ = normal<br />R_ = reverse>SS = strike-slip<br />T_ = thrust><br />The second two characters describe the slip direction:<br />__ = no data<br />C_ = center<br />E_ = east<br />LL = left lateral<br />N_ = north<br />NE = northeast<br />NW = northwest<br />RL = right lateral<br />S_ = south<br />SE = southeast<br />SW = southwest<br />W_ = west<br />Definition Source:  U.S. Geological Survey
public Text
  GeologicalFaultAgeText
Notes: The age of the fault in years.
public Text
  GeologicalFaultRateText
Notes: The rate of motion obtained when the amount of offset is divided by the<br />time interval.  It is normalized to millimeters per year.
public Text
  GeologicalFaultSlipSenseText
Notes: The angle of dip of the fault and the relative direction of movement across the fault.
public Text
  GeologicalFaultDipDirectionText
Notes: The general direction of the fault dip which is the angle that the fault<br />is inclined from the horizontal plane.
public String
  GeologicalFaultAgeCode
Range:0 to 1
Notes: A code indicating the age of the fault in years before the present.  The<br />code is used for symbolizing the lines in the map service and the National Atlas.<br />1 = Historic; referenced in dated recorded history, generally < 150    years<br />2 = Holocene <15,000 years<br />3 = Late Quaternary < 130,000 years<br />4 = Mid to late Quaternary < 750,000 years<br />5 = Quaternary < 1,600,000 years<br />6 = Class B; fault structures of questionable seismogenic origin that may be older than the Quaternary<br />Third digit: fault slip rate code: <br />1 = > 5 mm/year<br />2 = 1 - 5 mm/year<br />3 = 0.2 ? 1 mm/year<br />4 = < 0.2 mm/year<br />Definition Source: National Atlas of the United States
public Text
  GeologicalFaultFaultTypeText
Range:0 to 1
Notes: Fault type (i.e. Strike-Slip)<br />Source:  HSIP V2 comments
Object Type Connection Notes
«Feature» Hazard Class Generalization