Seismotectonic maps in the vicinity of the lower Wabash Valley, Illinois, Indiana, and Kentucky - Digital Spatial Database: Basement faults

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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: Basement faults
Abstract:
This cover contains faults in the unconformity at the Cambrian-Precambrian boundary. These data were contributed by Glenn Bear of Indiana University as part of the work on his doctoral thesis. The southern part of the map was produced by James Drahovzal of the Kentucky Geological Survey and merged with Bear's map of the rest of the map area and beyond. Public and proprietary seismic reflection and well data were used to define the basement structure.
A prominent east-west structure in the southern half of the map area is the western end of the Rough Creek Graben. At its deepest point the unconformity is more than 30,000 ft (9,100 m) below sea level. Faulted strata at this depth mean that the Rough Creek Fault System penetrates to hypocentral depths.
At the western edge of the map area, the graben bends to the southwest into the Reelfoot Rift and becomes more shallow. North of the Rough Creek Graben, and extending northward along the Wabash River, is the Wabash Valley Fault System. This fault system cuts an elliptical low in the unconformity. Some of the structure contours show horizontal offsets at depth that are opposite to the offsets expected from the known normal slip on the faults. Some authors interpret this as evidence of strike slip motion on these faults.
  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: Basement faults: U.S. Geological Survey Open-File Report 97-0681, U.S. Geological Survey, Denver, CO.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -89.12747955
    East_Bounding_Coordinate: -86.70026398
    North_Bounding_Coordinate: 38.49982834
    South_Bounding_Coordinate: 36.5
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: Cambrian-Precambrian
    Currentness_Reference:
    This is the most recent interpretation of the structure of the Cambrian-Precambrian unconformity in the map area (1997).
  5. What is the general form of this data set?
  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 (4)
      • String (129)
      • GT-polygon composed of chains (0)
    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?
    BFAULTS.PAT
    point symbols (Source: Rhea)
    SYMBOL
    symbol used to plot right lateral arrow and reverse fault (Source: Rhea)
    ValueDefinition
    125 
    126 
    BFAULTS.AAT
    attributes of arcs including line type and symbol used to plot arc (Source: Rhea)
    LINETYPE
    line type based on confidence of interpretation (Source: Bear)
    ValueDefinition
    solidcertain
    dasheduncertain
    SYMBOL
    symbol used to plot line, dashed or solid with dip tic or not (Source: Rhea)
    ValueDefinition
    197no dip, dashed
    199 
    no dip, solid 
    200 
    dip, dashed 
    201 
    dip, solid 
    INDEXSYM
    symbol used on index map (no dips or dashed lines) (Source: Rhea)
    ValueDefinition
    191no dips
    192dashed lines

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?
  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 2)
    Bear, G.W., and Drahovzal, J.A., written communication.

    Other_Citation_Details:
    Bear mapped faults in the northern part of the map area for his dissertation at Indiana University. Drahovzal mapped faults in the southern part for a planned Kentucky Geological Survey map. Bear combined both maps into one and sent us the digital files.
    Type_of_Source_Media: paper, electronic mail system
    Source_Scale_Denominator: 250000
    Source_Contribution:
    authors sent digital coordinates of contours via email and paper copy of map with depth contours via surface mail.
    (source 2 of 2)
    Bear, G.W., Rupp, J.A., and Rudman, A.J., 1997, Seismic interpretation of the deep structure of the Wabash Valley Fault System: Seismological Research Letters 68/4, Seis. Soc. America.

    Other_Citation_Details:
    p. 624-640. This paper discusses only the north-central part of the map area.
  2. How were the data generated, processed, and modified?
    Date: 30-Jul-1997 (process 1 of 2)
    Coordinates of fault lines were received via ftp, and a paper map was received via surface mail. Fault lines were converted to an arcinfo coverage and lines were coded for direction of fault motion.
    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?
    Wheeler, R.L., Rhea, Susan, Diehl, S.F., Drahovzal, J.A., Bear, G.W., and Sargent, M.L., 1997, Seismotectonic map showing faults, igneous rocks, and geophysical and neotectonic features in the vicinity of the lower Wabash Valley, Illinois, Indiana, and Kentucky: U.S. Geological Survey Miscellaneous Investigations Series Map I-2583-D, U.S. Geological Survey, Denver, CO.

    Other_Citation_Details: pamphlet accompanies map

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

  1. How well have the observations been checked?
    Confidence is indicated by value of attribute LINETYPE.
  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?
    dataset is complete as of September, 1997; contains all contours and depths
  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/bfaults.faq.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:06:53 2018