Seismotectonic maps in the vicinity of the lower Wabash Valley, Illinois, Indiana, and Kentucky - Digital Spatial Database: Depth to magnetic rocks

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Frequently anticipated questions:

What does this data set describe?

Title:
Seismotectonic maps in the vicinity of the lower Wabash Valley, Illinois, Indiana, and Kentucky - Digital Spatial Database: Depth to magnetic rocks
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.
  1. How might this data set be cited?
    Rhea, Susan, 1997, Seismotectonic maps in the vicinity of the lower Wabash Valley, Illinois, Indiana, and Kentucky - Digital Spatial Database: Depth to magnetic rocks: U.S. Geological Survey Open-File Report 97-0681, U.S. Geological Survey, Denver.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -92.92391205
    East_Bounding_Coordinate: -84.94763184
    North_Bounding_Coordinate: 38.93841934
    South_Bounding_Coordinate: 33.77402115
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 1990
    Ending_Date: 1995
    Currentness_Reference:
    Hildenbrand publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: map
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • Point (31)
      • String (110)
      • GT-polygon composed of chains (32)
    2. What coordinate system is used to represent geographic features?
      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitude and longitude values are specified in Decimal Degrees. The horizontal datum used is Unknown.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
  7. How does the data set describe geographic features?
    MAGDEP.PAT
    polygon labels with values between adjacent lines (Source: Rhea)
    DEPTH
    depth intermediate to adjacent depth contours (Source: Rhea)
    Range of values
    MAGDEP.AAT
    symbol codes and value of depth contour (Source: Hildenbrand)
    CODE
    symbol used to plot map (Source: Rhea)
    Formal codeset
    Codeset Name:inkcolor.lin
    Codeset Source:Computer Graphics Lab US Geological Survey Geologic Hazards Team Golden, CO
    DEPTH
    value of depth contour, kilometers below sea level (Source: Hildenbrand)
    Range of values

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Rhea, Susan
  2. Who also contributed to the data set?
    Hildenbrand
  3. To whom should users address questions about the data?
    Susan Rhea
    US Geological Survey
    Geophysicist
    MS966, Box 25046, Federal Center
    Denver, CO
    USA

    303-273-8639 (voice)
    303-273-8600 (FAX)
    rhea@usgs.gov
    Contact_Instructions: email is the best way to make contact

Why was the data set created?

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 at http://pubs.usgs.gov/of/1995/0574/

How was the data set created?

  1. From what previous works were the data drawn?
    (source 1 of 1)
    Hildenbrand, T.G., and Hendricks, J.D., 1995, 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: U.S. Geological Survey Professional Paper PP-1538, Capter E, US Geological Survey, Denver, CO.

    Other_Citation_Details: chapter E, 30 p
    Type_of_Source_Media: electronic
    Source_Scale_Denominator: 500,000
    Source_Contribution:
    authors sent electronic files of line locations with depth attributes
  2. How were the data generated, processed, and modified?
    Date: 24-Jul-1992 (process 1 of 2)
    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 .
    Date: 06-May-1998 (process 2 of 2)
    Creation of original metadata record Person who carried out this activity:
    Susan Rhea
    US Geological Survey
    Geophysicist
    MS966, Box 25046, Federal Center
    Denver, CO
    USA

    303-273-8639 (voice)
    303-273-8600 (FAX)
    rhea@usgs.gov
    Contact_Instructions: email is the best way to make contact
  3. What similar or related data should the user be aware of?
    Rhea, Susan, and Wheeler, R.L., 1995, Map showing synopsis of seismotectonic features in the the vicinity of New Madrid, Missouri: U.S. Geological Survey Miscellaneous Investigations Series Map I-2521, US Geological Survey, Denver, CO.

    Other_Citation_Details: scale 1:250,000

How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?
    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.
  2. How accurate are the geographic locations?
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
  5. How consistent are the relationships among the observations, including topology?
    Chain-node topology present.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: none
Use_Constraints: none
  1. Who distributes the data set? (Distributor 1 of 1)
    Susan Rhea
    US Geological Survey
    Geophysicist
    USGS Mail Stop 966
    Box 25046, Federal Center
    Denver, CO
    USA

    303-273-8639 (voice)
    303-273-8600 (FAX)
    rhea@usgs.gov
    Contact_Instructions: Email is the best way to make contact.
  2. What's the catalog number I need to order this data set? USGS Open-File Report 97-0681
  3. What legal disclaimers am I supposed to read?
    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.
  4. How can I download or order the data?
  5. What hardware or software do I need in order to use the data set?
    ARC/INFO version 7.0.3 or later or ArcView 3.0 or later

Who wrote the metadata?

Dates:
Last modified: 10-Jun-2016
Metadata author:
Peter N Schweitzer
USGS Midwest Area
Collection manager, USGS Geoscience Data Clearinghouse, http://geo-nsdi.er.usgs.gov/
Mail Stop 954
12201 Sunrise Valley Dr
Reston, VA
USA

703-648-6533 (voice)
703-648-6252 (FAX)
pschweitzer@usgs.gov
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://geo-nsdi.er.usgs.gov/metadata/open-file/97-681/magdep.faq.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:07:00 2018