Seismotectonic maps in the vicinity of the lower Wabash Valley, Illinois, Indiana, and Kentucky - Digital Spatial Database: Magnetotelluric sounding points and modelling lines

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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: Magnetotelluric sounding points and modelling lines
Abstract:
Magnetotelluric soundings give data that can help define the l electricamagnetic properties of rocks, and with other geophysical data help define the structure of the shallow crust where earthquakes occur. The sounding points in this cover show where data was collected that was then modelled for deep structure (see reference).
  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: Magnetotelluric sounding points and modelling lines: 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: -91.94407654
    East_Bounding_Coordinate: -86.77889252
    North_Bounding_Coordinate: 37.92121124
    South_Bounding_Coordinate: 34.66292953
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 1995
    Ending_Date: 1996
    Currentness_Reference:
    all soundings and modelling lines are included
  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 Point data set. It contains the following vector data types (SDTS terminology):
      • Point (47)
      • String (0)
      • 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. Latitudes are given to the nearest .001. Longitudes are given to the nearest .001. 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?
    MAGTELL.PAT
    location and identifying information (Source: Stanley)
    X-COORD
    longitude in decimal degrees (Source: Stanley)
    Range of values
    Minimum:-88.964
    Maximum:-87.542
    Y-COORD
    latitude in decimal degrees (Source: Stanley)
    Range of values
    Minimum:36.543
    Maximum:37.835
    PROFILE
    profile that uses this sounding point (Source: Stanley)
    ValueDefinition
    H 
    I 
    J 
    K 
    STATION
    code for sounding point station (Source: Stanley)
    ValueDefinition
    H1 
    H2 
    H3 
    H4 
    H5 
    H6 
    Range of values
    Minimum:1
    Maximum:43

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?
    Rhea
  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)
    Stanley, W.D., 1995, written comunication.

    (source 2 of 2)
    Stanley, W.D., and Rodriguez, B.D., 1996, Variations in structural style along the Reelfoot rift-Rough Creek graben system interpreted from magnetotelluric data: Seismological Research Letters vol 67, no 2, Seismological Society of Amer, Boulder, CO.

    Other_Citation_Details: p. 56
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 1000000
  2. How were the data generated, processed, and modified?
    Date: 28-Sep-1995 (process 1 of 2)
    Coordinates in decimal degrees were sent via email and coverted to arcinfo format. magtell was clipped from magtell_all.
    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., Diehl, S.F., Rhea, Susan, Sargent, M.L., Bear, G.W., 1997, Map showing selected wells and geophysical survey and modeling lines in the vicinity of the lower Wabash Valley, Illinois, Indiana, Kentucky: U.S. Geological Survey Miscellaneous Investigations Series Map I-2583-C, U.S. Geological Survey, Denver, CO.


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

  1. How well have the observations been checked?
    The attribute accuracy is described, where present, with each attribute defined in the Entity and Attribute Section.
  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?
    Point features 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/magtell.faq.html>
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