Seismotectonic maps in the vicinity of the lower Wabash Valley, Illinois, Indiana, and Kentucky - Digital Spatial Database: Gravity and aeromagnetic surveying and modeling 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: Gravity and aeromagnetic surveying and modeling lines
Abstract:
Lines in this cover show where gravity oe aeromagnetic data have been modelled to constrain subsurface structure. Gravity and magnetic signatures result from deep structure, such as might be at hypocentral depths of earthquakes. We show only the lines for which interpretations or models are publically available. In gravmag_all, extent of the lines outside the study boundary is retained; in gravmag the lines have been clipped to the study boundary.
  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: Gravity and aeromagnetic surveying and modeling 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: -89
    East_Bounding_Coordinate: -87
    North_Bounding_Coordinate: 39
    South_Bounding_Coordinate: 36.5
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 1982
    Ending_Date: 1996
  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 (0)
      • String (24)
      • 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?
    GRAVMAG.AAT
    name and reference of gravity and magnetic profiles (Source: Rhea)
    NAME
    name of gravity or magnetic profile, G, M, or GM for gravity, mag, or both (Source: Rhea)
    ValueDefinition
    G-CAA' 
    G-CBB' 
    G-CCC' 
    G-Cadiz North 
    G-Cadiz South 
    G-Cerulean 
    G-Crofton 
    G-Hamlin 
    G-Kelly 
    G-LBL 
    G-Murray 
    G-Newstead 
    G-Pleasant Green Hil 
    G-SKAA 
    G-Sinking Fork 
    G-Wallonia 
    GM-PAA' 
    GM-PBB' 
    GM-PCC' 
    GM-WW' 
    GM-WW'A 
    GM-WZ' 
    GM-YY' 
    M-SLAA 
    REF
    abbreviated reference for source or interpretation of profile (Source: Rhea)
    ValueDefinition
    Campbell 1983 
    Hildenbrand 1985 
    Hildenbrand 1996 
    Hildenbrand and Hendricks 1995 
    Keller 1995 
    Lumm 1988 
    Peregrine 1982 
    Sexton and others 1986 
    Sparlin and Lewis 1994 

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 10)
    Campbell, M.J., 1983, Combined interpretation of gravity, magnetic,and seismic reflection data as related to the northeast extension of the New Madrid fault zone: M.S. thesis, Purdue University, West Layfayette, IN.

    Other_Citation_Details: 78 p
    Type_of_Source_Media: figure
    (source 2 of 10)
    Hildenbrand, T.G., 1985, Rift structure of the northern Mississippi embayment from the analysis of gravity and magnetic data: Journal of Geophysical Research 90/B14.

    Other_Citation_Details: p 12,607-612,622
    (source 3 of 10)
    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 1538, Chapter E, US Geological Survey, Denver, CO.

    Other_Citation_Details: pages E1-E30
    (source 4 of 10)
    Hildenbrand, T.G.,Kucks, R.P., and Heigold, P.C., 1996, Magnetic and gravity study of the Paducah 1° x 2° CUSMAP quadrangle, Illinois, Indiana, Kentucky, and Missouri: U.S. Geological Survey Bulletin 2150-C, U.S. Geological Survey, Denver, CO.

    Other_Citation_Details: 22 pages
    (source 5 of 10)
    Keller, G. R., 1995, written commun..

    (source 6 of 10)
    Lumm, D.K., 1988, Gravity anomalies of the western portion of the Pennyrile fault system and Rough Creek graben, western Kentucky: M.S. thesis, Vanderbilt University, Nashville, TN.

    Other_Citation_Details: 155 p
    (source 7 of 10)
    Peregrine, K.A., 1982, Potential field enhancement and two-dimensional gravity and magnetic modeling of the northwest extension of the New Madrid tectonic feature: M.S. thesis, Purdue University, West Lafayette, IN.

    Other_Citation_Details: 217 p
    (source 8 of 10)
    Sexton, J.L., Braille, L.W., Hinze, W.J., and Campbell, M.J., 1986, Seismic reflection profiling studies of a buried Precambrian rift beneath the Wabash Valley fault zone: Geophysics 51.

    Other_Citation_Details: p. 640-660
    (source 9 of 10)
    Sparlin, M.A., and Lewis, R.D., 1994, Interpretation of the magnetic anomaly over the Omaha oil field, Gallatin County, Illinois: Geophysics 59.

    Other_Citation_Details: p 1092-1099
    (source 10 of 10)
    Whipple, T.D., 1989, Pre-Knox structure estimated from gravity near Land Between the Lakes, Kentucky and Tennessee: M.S. thesis, Vanderbilt University, Nashville, TN.

    Other_Citation_Details: 164 p
  2. How were the data generated, processed, and modified?
    Date: 05-Aug-1996 (process 1 of 2)
    Lines, except Hildenbrand's, were digitized from reports into arcinfo covers. Decimal degree coordinates for Hildenbrand's lines were sent via email and converted to arcinfo. Lines were labeled for reference on the paper map, and annotation was added. For gravmag, the data was clipped to the project boundary.
    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-Map 2583-C, 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?
  2. How accurate are the geographic locations?
    Many of the lines are portrayed on small-scale figures in reports. We attempted to generate digital coordinates of the lines from these reports, but the accuracy of location is poor.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Since our study focused on large structures that might penetrate to hypocentral depths, we excluded shallow geophysical surveys aimed at solving surficial problems (engineering, landfill, or mining problems.) We show only lines for which interpretations have been or will soon be published, including lines from theses and dissertations. We ignore most proprietary lines.
  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/gravmag.faq.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:06:56 2018