Identification_Information:
  Citation:
    Citation_Information:
      Originator: Rukstales, Kenneth S. (compiler)
      Publication_Date: 201201
      Title: Seismic Hazard Map for the United States
      Geospatial_Data_Presentation_Form: Map
      Publication_Information:
        Publication_Place: Reston, VA
        Publisher: National Atlas of the United States
      Online_Linkage: <http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>
  Description:
    Abstract:
      This map layer shows seismic hazard in the United States.  The data
      represent a model showing the probability that ground motion will reach a
      certain level.  This map layer shows peak horizontal ground acceleration
      (the fastest measured change in speed, for a particle at ground level that
      is moving horizontally due to an earthquake) with a 10% probability of
      exceedance in 50 years.  Values are given in %g, where g is acceleration
      due to gravity, or 9.8 meters/second^2.  The lines of equal hazard, which

      are the lines between the polygons, were determined by interpolating from
      a grid of equally spaced points in latitude and longitude.  Each point was
      weighted based on the seismic hazard at that location.  The grid spacing
      is 0.1 degrees for Alaska, 0.05 degrees for the conterminous United States,
      and 0.02degrees for Hawaii.
    Purpose:
      This map summarizes the quantitative information, available from geologic
      and geophysical sources, about seismic ground motion hazard in the United
      States.  The 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 1:2,000,000-scale data.

      No responsibility is assumed by the U.S. Geological Survey or the National
      Atlas of the United States in the use of these data.

    Supplemental_Information:
      This map layer was prepared by combining spatially-smoothed historic
      seismicity information with information from fault-specific sources.  The
      acceleration values contoured are the random horizontal component.  The
      reference site condition is firm rock, defined as having an average shear-
      wave velocity of 760 meters/second in the top 30 meters corresponding to
      the boundary between National Earthquake Hazards Reduction Program (NEHRP)
      site classes B and C.

      For more information about the USGS National Seismic Hazard Maps, please
      visit <http://earthquake.usgs.gov/hazards/index.php.

      A description of how the underlying geologic and geophysical data
      were prepared as well as the methodology used in calculating seismic
      hazard for a geographic location can be found in the following reports:

      Petersen, M.D., Frankel, A.D., Harmsen, S.C., Mueller, C.S., Haller, K.M., Wheeler, R.L.,
      Wesson, R.L., Zeng, Yuehua, Boyd, O.S., Perkins, D.M., Luco, Nicolas, Field, E.H.,
      Wills, C.J., and Rukstales, K.S., 2008, Documentation for the 2008 Update of the United
      States National Seismic Hazard Maps:  U.S. Geological Survey Open-File Report
      2008-1128, 61 p.

      Klein, F.W., A.D. Frankel, C.S. Mueller, R.L. Wesson and P.G. Okubo, 2001,
      Seismic Hazard in Hawaii: high rate of large earthquakes and probabilistic
      ground motion maps, Bulletin of the Seismological Society of America,
      v. 91, pp. 479-498.

      Wesson, Robert L., Boyd, Oliver S., Mueller, Charles S., Bufe, Charles G.,
      Frankel, Arthur D., Petersen, Mark D., 2007, Revision of time-Independent
      probabilistic seismic hazard maps for Alaska: U.S. Geological Survey
      Open-File Report 2007-1043, 33p.

  Time_Period_of_Content:
    Time_Period_Information:
      Single_Date/Time:
        Calendar_Date: 2012
    Currentness_Reference: Publication date

  Status:
    Progress: Complete
    Maintenance_and_Update_Frequency: As Needed

  Spatial_Domain:
    Bounding_Coordinates:
      West_Bounding_Coordinate: 172
      East_Bounding_Coordinate: -66
      North_Bounding_Coordinate: 72
      South_Bounding_Coordinate: 18

  Keywords:
    Theme:
      Theme_Keyword_Thesaurus: ISO 19115 Topic Category
      Theme_Keyword: geoscientificInformation
    Theme:
      Theme_Keyword_Thesaurus: None
      Theme_Keyword: Seismic
      Theme_Keyword: Earthquakes
      Theme_Keyword: Hazards

    Place:
      Place_Keyword_Thesaurus: None
      Place_Keyword: Alabama
      Place_Keyword: Alaska
      Place_Keyword: Arizona
      Place_Keyword: Arkansas
      Place_Keyword: California
      Place_Keyword: Colorado
      Place_Keyword: Connecticut
      Place_Keyword: Delaware
      Place_Keyword: District of Columbia
      Place_Keyword: Florida
      Place_Keyword: Georgia
      Place_Keyword: Hawaii
      Place_Keyword: Idaho
      Place_Keyword: Illinois
      Place_Keyword: Indiana
      Place_Keyword: Iowa
      Place_Keyword: Kansas
      Place_Keyword: Kentucky
      Place_Keyword: Louisiana
      Place_Keyword: Maine
      Place_Keyword: Maryland
      Place_Keyword: Massachusetts
      Place_Keyword: Michigan
      Place_Keyword: Minnesota
      Place_Keyword: Mississippi
      Place_Keyword: Missouri
      Place_Keyword: Montana
      Place_Keyword: Nebraska
      Place_Keyword: Nevada
      Place_Keyword: New Hampshire
      Place_Keyword: New Jersey
      Place_Keyword: New Mexico
      Place_Keyword: New York
      Place_Keyword: North Carolina
      Place_Keyword: North Dakota
      Place_Keyword: Ohio
      Place_Keyword: Oklahoma
      Place_Keyword: Oregon
      Place_Keyword: Pennsylvania
      Place_Keyword: Rhode Island
      Place_Keyword: South Carolina
      Place_Keyword: South Dakota
      Place_Keyword: Tennessee
      Place_Keyword: Texas
      Place_Keyword: Utah
      Place_Keyword: Vermont
      Place_Keyword: Virginia
      Place_Keyword: Washington
      Place_Keyword: West Virginia
      Place_Keyword: Wisconsin
      Place_Keyword: Wyoming
      Place_Keyword: USA

  Access_Constraints: None.
  Use_Constraints:
    Acknowledgment of the National Atlas of the United States of America and
    (or) the U.S. Geological Survey, National Seismic Hazard Mapping Project
    would be appreciated in products derived from these data.
  Point_of_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Ken Rukstales
        Contact_Organization: U.S. Geological Survey
      Contact_Address:
        Address_Type: Mailing address
        Address: Box 25046, Mail Stop 966
        City: Denver
        State_or_Province: CO
        Postal_Code: 80225
        Country: USA
      Contact_Voice_Telephone: 303-273-8677
      Contact_Facsimile_Telephone: 303-273-8600
      Contact_Electronic_Mail_Address: rukstales@usgs.gov
      Contact_Instructions: Please contact via e-mail or telephone
  Native_Data_Set_Environment:
    Windows XP
    ArcGIS version 10
  Cross_Reference:
    Citation_Information:
      Originator: M. Petersen
      Originator: A. Frankel
      Originator: S. Harmsen
      Originator: C. Mueller
      Originator: K. Haller
      Originator: R. Wheeler
      Originator: R. Wesson
      Originator: Y. Zeng
      Originator: O. Boyd
      Originator: D. Perkins
      Originator: N. Luco
      Originator: E. Field
      Originator: C. Wills
      Originator: K. Rukstales
      Publication_Date: 2011
      Title: Seismic-Hazard Maps for the Conterminous United States, 2008
      Geospatial_Data_Presentation_Form: Map
      Series_Information:
        Series_Name: U.S. Geological Survey Scientific Investigations Map
        Issue_Identification: 3195
      Publication_Information:
        Publication_Place: Reston, VA
        Publisher: U.S. Geological Survey
      Other_Citation_Details: 6 sheets, scale 1:7,000,000
  Cross_Reference:
    Citation_Information:
      Originator: F.W. Klein
      Originator: A.D. Frankel
      Originator: C.S. Mueller
      Originator: R.L. Wesson
      Originator: P.G. Okubo
      Publication_Date: 2000
      Title: Seismic-Hazard Maps for Hawaii
      Geospatial_Data_Presentation_Form: Map

      Series_Information:
        Series_Name: U.S. Geological Survey Geologic Investigations Series Map
        Issue_Identification: I-2724
      Publication_Information:
        Publication_Place: Reston, VA
        Publisher: U.S. Geological Survey
      Other_Citation_Details: 2 sheets, scale 1:2,000,000

Data_Quality_Information:
  Attribute_Accuracy:
    Attribute_Accuracy_Report:
      This map layer is based on a theoretical model.  The following resources
      provide information on quality assessment for the map layer:

      Petersen, M., A. Frankel, S. Harmsen, C. Mueller, K. Haller, R. Wheeler,
      R. Wesson, Y. Zeng, O. Boyd, D. Perkins, N. Luco, E. Field, C. Wills and
      K. Rukstales, 2008, Documentation for the 2008 Update of the United States
      National Seismic-Hazard Maps:    U.S. Geological Survey Open-File Report
      2008-1128, 61 p.

      Klein, F.W., A.D. Frankel, C.S. Mueller, R.L. Wesson and P.G. Okubo, 2001,
      Seismic Hazard in Hawaii: high rate of large earthquakes and probabilistic
      ground motion maps, Bulletin of the Seismological Society of America,
      v. 91, pp. 479-498.

      Wesson, Robert L., Boyd, Oliver S., Mueller, Charles S., Bufe, Charles G.,
      Frankel, Arthur D., Petersen, Mark D., 2007, Revision of time-Independent
      probabilistic seismic hazard maps for Alaska: U.S. Geological Survey
      Open-File Report 2007-1043, 33p.

  Logical_Consistency_Report:
    Polygon and chain-node topology are present.

    Uncertainty in the underlying seismicity or fault parameters was not
    considered in the production of this map layer.

  Completeness_Report: This map layer shows levels of seismic hazard for the United States.
  Positional_Accuracy:
    Horizontal_Positional_Accuracy:
      Horizontal_Positional_Accuracy_Report:
        The location of features is based on theoretical calculations of a
        seismological model for the study area.  The location of each point
        is considered to be correct within the confines of computer accuracy.
  Lineage:
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: M. Petersen
          Originator: A. Frankel
          Originator: S. Harmsen
          Originator: C. Mueller
          Originator: K. Haller
          Originator: R. Wheeler
          Originator: R. Wesson
          Originator: Y. Zeng
          Originator: O. Boyd
          Originator: D. Perkins
          Originator: N. Luco
          Originator: E. Field
          Originator: C. Wills
          Originator: K. Rukstales
          Publication_Date: 2011
          Title: Seismic-Hazard Maps for the Conterminous United States, 2008
          Geospatial_Data_Presentation_Form: Map
          Series_Information:
            Series_Name: U.S. Geological Survey Scientific Investigations Map
            Issue_Identification: 3195
          Publication_Information:
            Publication_Place: Reston, VA
            Publisher: U.S. Geological Survey
          Other_Citation_Details: 6 sheets
      Source_Scale_Denominator: 7000000
      Type_of_Source_Media: Paper
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 2011
        Source_Currentness_Reference: Publication date
      Source_Citation_Abbreviation: SH-USA
      Source_Contribution:
        The publication describes the conterminous United States historical
        seismicity and fault-specific sources used to build the theoretical
        model, as well as the methodology employed.
    Source_Information:
      Source_Citation:
        Citation_Information:
          Originator: F.W. Klein
          Originator: A.D. Frankel
          Originator: C.S. Mueller
          Originator: R.L. Wesson
          Originator: P.G. Okubo
          Publication_Date: 2000
          Title: Seismic-Hazard Maps for Hawaii
          Geospatial_Data_Presentation_Form: Map
          Series_Information:
            Series_Name: U.S. Geological Survey Geologic Investigations Series Map
            Issue_Identification: I-2724
          Publication_Information:
            Publication_Place: Reston, VA
            Publisher: U.S. Geological Survey
          Other_Citation_Details: 2 sheets
      Source_Scale_Denominator: 2000000
      Type_of_Source_Media: Paper
      Source_Time_Period_of_Content:
        Time_Period_Information:
          Single_Date/Time:
            Calendar_Date: 2000
        Source_Currentness_Reference: Publication date
      Source_Citation_Abbreviation: SH-Hawaii
      Source_Contribution:
        The publication describes the Hawaiian historical seismicity and fault specific
        sources used to build the theoretical model, as well as the methodology employed.
    Process_Step:
      Process_Description:
        Information drawn from the sources was used to produce an ASCII file
        of grid points having a latitude and longitude spacing of 0.1 degrees
        (Alaska), 0.05 degrees (conterminous United States), or 0.02 degrees
        (Hawaii).  For each grid point an associated acceleration value, or
        weight, was calculated from the historic seismicity and fault-specific
        sources, according to the prescribed seismological model.  The data were
        then contoured using ArcGIS.  The desired final lines of equal
        seismological hazard were selected and polygon and arc topology were
        ascertained as well as appropriate feature attributes.  The file was
        converted to Shapefile format.
      Process_Date: 2012
      Process_Contact:
        Contact_Information:
          Contact_Person_Primary:
            Contact_Person: Ken Rukstales
            Contact_Organization: U.S. Geological Survey
          Contact_Address:
            Address_Type: Mailing address
            Address: Box 25046, Mail Stop 966
            City: Denver
            State_or_Province: Colorado
            Postal_Code: 80225
            Country: USA
          Contact_Voice_Telephone: 303-273-8677
          Contact_Facsimile_Telephone: 303-273-8600
          Contact_Electronic_Mail_Address: rukstales@usgs.gov
          Contact_Instructions: Please contact via e-mail or telephone

Spatial_Data_Organization_Information:
  Direct_Spatial_Reference_Method: Vector
  Point_and_Vector_Object_Information:
    SDTS_Terms_Description:
      SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
      Point_and_Vector_Object_Count: 3647

Spatial_Reference_Information:
  Horizontal_Coordinate_System_Definition:
    Geographic:
      Latitude_Resolution: 0.000278
      Longitude_Resolution: 0.000278
      Geographic_Coordinate_Units: Decimal degrees
    Geodetic_Model:
      Horizontal_Datum_Name: North American Datum of 1983
      Ellipsoid_Name: GRS1980
      Semi-major_Axis: 6378137.0
      Denominator_of_Flattening_Ratio: 298.257222

Entity_and_Attribute_Information:
  Detailed_Description:
    Entity_Type:
      Entity_Type_Label: Areas of seismic hazard (described by seihazp020.dbf).
      Entity_Type_Definition:
        Areas of predicted peak horizontal ground acceleration within the
        specified range, with a 10% probability of exceedance in 50 years.
      Entity_Type_Definition_Source: U.S. Geological Survey
    Attribute:
      Attribute_Label: FID
      Attribute_Definition: Internal feature number.
      Attribute_Definition_Source: ESRI
      Attribute_Domain_Values:
        Unrepresentable_Domain: Sequential unique whole numbers that are automatically generated.
    Attribute:
      Attribute_Label: Shape
      Attribute_Definition: The representation of the entity in the data.
      Attribute_Definition_Source: National Atlas of the United States
      Attribute_Domain_Values:
        Enumerated_Domain:
          Enumerated_Domain_Value: Polygon
          Enumerated_Domain_Value_Definition: 2-dimensional element
          Enumerated_Domain_Value_Definition_Source: ESRI GIS software
    Attribute:
      Attribute_Label: Valley
      Attribute_Definition: A code indicating whether the polygon represents a local minima.
      Attribute_Definition_Source: U.S. Geological Survey
      Attribute_Domain_Values:
        Enumerated_Domain:
          Enumerated_Domain_Value: 0
          Enumerated_Domain_Value_Definition: The polygon is not a local minima.
          Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey
      Attribute_Domain_Values:
        Enumerated_Domain:
          Enumerated_Domain_Value: 1
          Enumerated_Domain_Value_Definition: The polygon is a local minima.
          Enumerated_Domain_Value_Definition_Source: U.S. Geological Survey
    Attribute:
      Attribute_Label: ACC_VAL
      Attribute_Definition: The minimum peak horizontal acceleration value for the polygon, %g.
      Attribute_Definition_Source: USGS
      Attribute_Domain_Values:
        Enumerated_Domain:
          Enumerated_Domain_Value: 0 - 1
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 0% to 1% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 1 - 2
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 1% to 2% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 2 - 3
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 2% to 3% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 3 - 4
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 3% to 4% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 4 - 5
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 4% to 5% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 5 - 6
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 5% to 6% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 6 - 7
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 6% to 7% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 7 - 8
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 7% to 8% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 8 - 9
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 8% to 9% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 9 - 10
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 9% to 10% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 10 - 15
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 10% to 15% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 15 - 20
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 15% to 20% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 20 - 25
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 20% to 25% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 25 - 30
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 25% to 30% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 30 - 40
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 30% to 40% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 40 - 60
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 40% to 60% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 60 - 80
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 60% to 80% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: 80 - 100
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon range from 80% to 100% g
          Enumerated_Domain_Value_Definition_Source: USGS
        Enumerated_Domain:
          Enumerated_Domain_Value: > 100
          Enumerated_Domain_Value_Definition: Acceleration values within the polygon have values >= 100% g
          Enumerated_Domain_Value_Definition_Source: USGS
Distribution_Information:
  Distributor:
    Contact_Information:
      Contact_Organization_Primary:
        Contact_Organization: Earth Science Information Center, U.S. Geological Survey
      Contact_Address:
        Address_Type: Mailing address
        Address: 507 National Center
        City: Reston
        State_or_Province: VA
        Postal_Code: 20192
      Contact_Voice_Telephone: 1-888-ASK-USGS (1-888-275-8747)
      Contact_Voice_Telephone: 703-648-5920
      Contact_Instructions:
        In addition to the address above there are other ESIC offices
        throughout the country.  A full list of these offices is at
        <http://ask.usgs.gov/esic_index.html>.

  Distribution_Liability:
    Although these data have been processed successfully on a computer system
    at the U.S. Geological Survey, no warranty expressed or implied is made by
    the U.S. Geological Survey regarding the utility of the data on any other
    system, nor shall the act of distribution constitute any such warranty.
    No responsibility is assumed by the U.S. Geological Survey in the use of
    these data.

  Standard_Order_Process:
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: ESRI Shapefile
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: <http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>
    Digital_Form:
      Digital_Transfer_Information:
        Format_Name: SDTS
      Digital_Transfer_Option:
        Online_Option:
          Computer_Contact_Information:
            Network_Address:
              Network_Resource_Name: <http://nationalatlas.gov/atlasftp.html?openChapters=chpgeol#chpgeol>
    Fees: There is no charge for the map layer.

Metadata_Reference_Information:
  Metadata_Date: 20120118
  Metadata_Contact:
    Contact_Information:
      Contact_Person_Primary:
        Contact_Person: Peg Rawson
        Contact_Organization: National Atlas of the United States
      Contact_Address:
        Address_Type: Mailing address
        Address: 12201 Sunrise Valley Dr
        Address: MS 561
        City: Reston
        State_or_Province: VA
        Postal_Code: 20192
        Country: USA
      Contact_Voice_Telephone: 703-648-4183
      Contact_Electronic_Mail_Address: atlasmail@usgs.gov
  Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
  Metadata_Standard_Version: FGDC-STD-001-1998
  Metadata_Security_Information:
    Metadata_Security_Classification_System: None
    Metadata_Security_Classification: Unclassified
    Metadata_Security_Handling_Description: None