Metadata:
  Identification_Information:
    Citation:
      Citation_Information:
        Originator: Rhea, Susan
        Publication_Date: 1997
        Title:
          Seismotectonic maps in the vicinity of the lower Wabash Valley,
          Illinois, Indiana, and Kentucky - Digital Spatial Database:
          depth to magnetic rocks
        Geospatial_Data_Presentation_Form: map
        Series_Information:
          Series_Name: U.S. Geological Survey Open-File Report
          Issue_Identification: 97-0681
        Publication_Information:
          Publication_Place: Denver
          Publisher: U.S. Geological Survey
        Online_Linkage: <URL:ftp://greenwood.cr.usgs.gov/pub/open-file-reports/ofr-97-0681>
    Description:
      Abstract:
        The structure of and depth to the floor of the Mississippi Valley and
        Rough Creel Grabens and surrounding regions
        were interpreted from aeromagnetic data.
        This cover contains the depth contours for the region within this
        study area and was clipped from the larger cover.

        This cover was not plotted in the Wabash Valley map series, but is
        included for those users who are interested in comparing the depth
        to basement from geologic data (bcontours and bfaults) to the depth
        to magnetic rocks (usually basement) from geophysical data.
        Depth units in this cover are
        kilometers below sea level, whereas depth units in bcontours are in
        thousands of feet below sea level.

      Purpose:
        The data was generated to help in understanding the seismotectonic
        hazards in the vicinity of the lower Wabash Valley. This data
        complements similar data collected in the vicinity of New Madrid, MO
        (US Geological Survey Open-File Report 95-0574, available via ftp at
        <URL:/ftp://greenwood.cr.usgs.gov/pub/open-file-reports/ofr-95-0574>)

    Time_Period_of_Content:
      Time_Period_Information:
        Range_of_Dates/Times:
          Beginning_Date: 1990
          Ending_Date: 1995
      Currentness_Reference: Hildenbrand publication date
    Status:
      Progress: complete
      Maintenance_and_Update_Frequency: none planned
    Spatial_Domain:
      Bounding_Coordinates:
        West_Bounding_Coordinate: -92.92391205
        East_Bounding_Coordinate: -84.94763184
        North_Bounding_Coordinate: 38.93841934
        South_Bounding_Coordinate: 33.77402115
    Keywords:
      Theme:
        Theme_Keyword_Thesaurus: None
        Theme_Keyword: magnetic basement
      Place:
        Place_Keyword_Thesaurus: None
        Place_Keyword: Wabash Valley
    Access_Constraints: none
    Use_Constraints: none
    Point_of_Contact:
      Contact_Information:
        Contact_Person_Primary:
          Contact_Person: Susan Rhea
          Contact_Organization: US Geological Survey
        Contact_Position: Geophysicist
        Contact_Address:
          Address_Type: mailing address
          Address: MS966, Box 25046, Federal Center
          City: Denver
          State_or_Province: CO
          Postal_Code: 80225
          Country: USA
        Contact_Voice_Telephone: 303-273-8639
        Contact_Facsimile_Telephone: 303-273-8600
        Contact_Electronic_Mail_Address: rhea@usgs.gov
        Contact_Instructions: email is the best way to make contact
    Data_Set_Credit: Hildenbrand
    Native_Data_Set_Environment: SunOS, 5.5.1, sun4u UNIX, ARC/INFO version 7.1.1
    Cross_Reference:
      Citation_Information:
        Originator: Rhea, Susan, and Wheeler, R.L.
        Publication_Date: 1995
        Title:
          Map showing synopsis of seismotectonic features in the the vicinity
          of New Madrid, Missouri
        Series_Information:
          Series_Name: US Geological Survey Miscellaneous Investigations Map
          Issue_Identification: I-2521
        Publication_Information:
          Publication_Place: Denver, CO
          Publisher: US Geological Survey
        Other_Citation_Details: scale 1:250,000
  Data_Quality_Information:
    Attribute_Accuracy:
      Attribute_Accuracy_Report:
        Original data from author has been altered for graphic presentation;
        specifically, 'weedtol' (distance betweeen vertices defining a line)
        is smaller than in the original data so that smoother lines are drawn.
    Logical_Consistency_Report: Chain-node topology present.
    Positional_Accuracy:
      Horizontal_Positional_Accuracy:
        Quantitative_Horizontal_Positional_Accuracy_Assessment:
          Horizontal_Positional_Accuracy_Value: 10 km
          Horizontal_Positional_Accuracy_Explanation: Resolution as reported
    Lineage:
      Source_Information:
        Source_Citation:
          Citation_Information:
            Originator: Hildenbrand, T.G., and Hendricks, J.D.
            Publication_Date: 1995
            Title:
              Geophysical setting of the Reelfoot Rift and relations between
              rift structures and the New Madrid seismic zone, in Shedlock,
              K.M., and Johnston, A.C., eds., Investigations of the New Madrid
              seismic zone
            Series_Information:
              Series_Name: U.S. Geological Survey Professional Paper
              Issue_Identification: PP-1538, Capter E
            Publication_Information:
              Publication_Place: Denver, CO
              Publisher: US Geological Survey
            Other_Citation_Details: chapter E, 30 p
        Source_Scale_Denominator: 500,000
        Type_of_Source_Media: electronic
        Source_Contribution:
          authors sent electronic files of line locations
          with depth attributes
        Source_Time_Period_of_Content:
          Time_Period_Information:
            Range_of_Dates/Times:
              Beginning_Date: 1990
              Ending_Date: 1995
          Source_Currentness_Reference:
      Process_Step:
        Process_Description:
          Coordinate and depth records were received via email from Hildenbrand
          and converted to arc/info format by Rhea. Resulting arcs were smoothed
          by changing weed tolerance and using generalize and spline
          commands. Replication from original data probably not possible,
          although close approximations should be realizable.

          Arcs have Hildenbrand's original depth to magnetic basement values,
          determined from extensive analysis and modeling.

          Rhea converted the arc coverage to a polygon coverage so that
          depth bands could be shaded. Depth values intermediate to the
          adjacent contour lines were added by Rhea .

        Process_Date: 19920724
        Process_Time: 1509

  Spatial_Data_Organization_Information:
    Direct_Spatial_Reference_Method: Vector
    Point_and_Vector_Object_Information:
      SDTS_Terms_Description:
        SDTS_Point_and_Vector_Object_Type: Point
        Point_and_Vector_Object_Count: 31
        SDTS_Point_and_Vector_Object_Type: String
        Point_and_Vector_Object_Count: 110
        SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
        Point_and_Vector_Object_Count: 32
  Spatial_Reference_Information:
    Horizontal_Coordinate_System_Definition:
      Geographic:
        Geographic_Coordinate_Units: Decimal Degrees
      Geodetic_Model:
        Horizontal_Datum_Name: Unknown
        Ellipsoid_Name: Clarke 1866
        Semi-major_Axis: 6378206.4
        Denominator_of_Flattening_Ratio: 294.98
  Entity_and_Attribute_Information:
    Detailed_Description:
      Entity_Type:
        Entity_Type_Label: MAGDEP.PAT
        Entity_Type_Definition: polygon labels with values between adjacent lines
        Entity_Type_Definition_Source: Rhea
      Attribute:
        Attribute_Label: DEPTH
        Attribute_Definition: depth intermediate to adjacent depth contours
        Attribute_Definition_Source: Rhea
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum:
            Range_Domain_Maximum:
      Entity_Type:
        Entity_Type_Label: MAGDEP.AAT
        Entity_Type_Definition: symbol codes and value of depth contour
        Entity_Type_Definition_Source: Hildenbrand
      Attribute:
        Attribute_Label: CODE
        Attribute_Definition: symbol used to plot map
        Attribute_Definition_Source: Rhea
        Attribute_Domain_Values:
          Codeset_Domain:
            Codeset_Name: inkcolor.lin
            Codeset_Source:
              Computer Graphics Lab
              US Geological Survey
              Geologic Hazards Team
              Golden, CO
      Attribute:
        Attribute_Label: DEPTH
        Attribute_Definition: value of depth contour, kilometers below sea level
        Attribute_Definition_Source: Hildenbrand
        Attribute_Domain_Values:
          Range_Domain:
            Range_Domain_Minimum:
            Range_Domain_Maximum:
  Distribution_Information:
    Distributor:
      Contact_Information:
        Contact_Person_Primary:
          Contact_Person: Susan Rhea
          Contact_Organization: US Geological Survey
        Contact_Position: Geophysicist
        Contact_Address:
          Address_Type: mailing address
          Address:
            USGS Mail Stop 966
            Box 25046, Federal Center
          City: Denver
          State_or_Province: CO
          Postal_Code: 80225-0046
          Country: USA
        Contact_Voice_Telephone: 303-273-8639
        Contact_Facsimile_Telephone: 303-273-8600
        Contact_Electronic_Mail_Address: rhea@usgs.gov
        Contact_Instructions: Email is the best way to make contact.
    Resource_Description: USGS Open-File Report 97-0681
    Distribution_Liability:
      This report is preliminary and has not been reviewed for
      conformity with U.S. Geological Survey editorial standards
      and stratigraphic nomenclature. Any use of trade names is
      for descriptive purposes only and does not imply endorsement
      by the USGS.
    Technical_Prerequisites: ARC/INFO version 7.0.3 or later or ArcView 3.0 or later
    Standard_Order_Process:
      Digital_Form:
        Digital_Transfer_Information:
          Format_Name: ARCE
          Format_Version_Number: 7.0.3
          Format_Information_Content: Each coverage contains isoseismal data for one event (two for i187609)
          File_Decompression_Technique: Files may be compressed with gzip; use gzip -d or gunzip to uncompress.
        Digital_Transfer_Option:
          Online_Option:
            Computer_Contact_Information:
              Network_Address:
                Network_Resource_Name: ftp://greenwood.cr.usgs.gov/pub/open-file-reports/ofr-97-0681/e00_files/magdep.e00
            Online_Computer_and_Operating_System: Data General AViiON 6220 running DG/UX 5.4R3.10 (Unix)
      Fees: none
  Metadata_Reference_Information:
    Metadata_Date: 19980506
    Metadata_Contact:
      Contact_Information:
        Contact_Person_Primary:
          Contact_Person: Susan Rhea
          Contact_Organization: US Geological Survey
        Contact_Position: Geophysicist
        Contact_Address:
          Address_Type: mailing address
          Address: MS966, Box 25046, Federal Center
          City: Denver
          State_or_Province: CO
          Postal_Code: 80225
          Country: USA
        Contact_Voice_Telephone: 303-273-8639
        Contact_Facsimile_Telephone: 303-273-8600
        Contact_Electronic_Mail_Address: rhea@usgs.gov
        Contact_Instructions: email is the best way to make contact
    Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
    Metadata_Standard_Version: 19940608