Seismotectonic maps in the vicinity of the lower Wabash Valley, Illinois, Indiana, and Kentucky - Digital Spatial Database: Instrumental earthquake locations

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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: Instrumental earthquake locations
Abstract:
This cover contains the catalog of earthquake locations, within the project boundary, recorded by the Saint Louis University and Memphis State University seismic networks from July 1974 through December 1995.
  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: Instrumental earthquake locations: 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: -104.05999756
    East_Bounding_Coordinate: -74.54499817
    North_Bounding_Coordinate: 44.37400055
    South_Bounding_Coordinate: 29.72699928
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: May-1975
    Ending_Date: Dec-1995
    Currentness_Reference:
    data are current as of December, 1995
  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 (170)
      • 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. 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?
    EQKS.PAT
    earthquake location data (Source: Rhea)
    DATE
    YYMMDD of earthquake, Universal Time Coordinated (Source: Saint Louis University)
    Range of values
    Minimum:740729
    Maximum:940926
    TYPE
    refers to central US velocity model used to locate earthquake (Source: Herrmann, see reference)
    ValueDefinition
    0 
    1 
    HR
    origin time hour, Greenwich Universal Time Coordinated
    Range of values
    Minimum:0
    Maximum:23
    Units:hours
    Resolution:1
    MIN
    origin time minute
    Range of values
    Minimum:0
    Maximum:59
    Units:minutes
    Resolution:1
    SEC
    origin time seconds with partial seconds
    Range of values
    Minimum:0
    Maximum:59.84
    Units:seconds
    Resolution:0.01
    LAT
    location, latitude north
    Range of values
    Minimum:36.602
    Maximum:38.996
    Units:degrees
    Resolution:0.001
    LONG
    location, longitude W
    Range of values
    Minimum:-89.000
    Maximum:-87.028
    Units:degrees
    Resolution:0.001
    DEPTH
    location, depth in kilometers
    Range of values
    Minimum:0.6
    Maximum:21.0
    Units:kilometers
    Resolution:0.1
    DEPTAG
    tag for free or fixed depth in location routine
    ValueDefinition
    (blank)free depth in location routine
    MAG
    magnitude, computed from averaged displacement magnitudes at each station
    Range of values
    Minimum:0.0
    Maximum:5.2
    Resolution:0.1
    NSTA
    number of stations used to determine earthquake location
    Range of values
    Minimum:0
    Maximum:94
    NPHASE
    number of p- and s- phases used to determine earthquake location
    Range of values
    Minimum:0
    Maximum:94
    GAP
    largest aperture between stations recording earthquake, in degrees
    Range of values
    Minimum:0
    Maximum:337
    Resolution:1
    DMIN
    epicentral distance to closest station, in km
    Range of values
    Minimum:0
    Maximum:273
    Resolution:1
    RMS
    Root Mean Square of travel-time residuals after location algorithm iterations
    Range of values
    Minimum:0.00
    Maximum:1.80
    Units:seconds
    Resolution:0.1
    ERH
    standard error of horizontal location in km
    Range of values
    Minimum:0.00
    Maximum:20.0
    Units:kilometers
    Resolution:0.1
    ERZ
    standard error of depth in km
    Range of values
    Minimum:0.00
    Maximum:73.6
    Units:kilometers
    Resolution:0.1
    QH
    quality of horizontal location, based on evaluation of ERH, RMS, NSTA, and NPHAS
    ValueDefinition
    U 
    a 
    b 
    c 
    d 
    n 
    u 
    QZ
    quality of depth location, based on evaluation of ERZ, RMS, NSTA, and NPHASE
    ValueDefinition
    P 
    a 
    b 
    c 
    d 
    p 
    u 
    MOD
    code for velocity model used to compute earthquake location
    ValueDefinition
    EMBembayment
    UPLuplands
    TST 
    S 
    s 
    (blank) 
    DFLAG
    ValueDefinition
    (blank) 
    D 
    MBLG3
    magnitude determined from Lg surface waves
    Range of values
    Minimum:0.0
    Maximum:0.0

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?
    staff at Saint Louis Seismic Observatory, Saint Louis University
  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 were generated to help in understanding the seismotectonic hazards in the vicinity of the lower Wabash Valley. These data complement 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)
    Hermann, Robert and Whittington, Melanie, annual, Central Mississippi Valley Earthquake Bulletin: Saint Louis University, St. Loius, MO.

    Type_of_Source_Media: electronic file transfer
    Source_Contribution:
    digital listing of earthquakes received via ftp, Rhea converted to arc/info coverage
  2. How were the data generated, processed, and modified?
    Date: 25-Oct-1995 (process 1 of 2)
    Catalog emailed from staff at St. Louis Seismic Observatory and converted to ARC/INFO coverage. Additional earthquake locations included annually or as available. Data projected into Albers Equal Area projection and clipped to 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?
    Rhea, Susan, and Wheeler, R.L., 1996, Map showing seismicity in the vicinity of the lower Wabash Valley, Illinois, Indiana, and Kentucky: U.S. Geological Survey Miscellaneous Investigations Series Map I-Map 2583-A, 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?
    Quality is given explicitly in the attribute values ERH, ERZ, QH, and QZ.
  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?
    All earthquakes included in the Saint Louis Bulletin located within the project boundary are in the dataset.
  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/eqks.faq.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:06:54 2018