Gravity and magnetic surveys over the Santa Rita fault system, southeastern Arizona

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Frequently anticipated questions:

What does this data set describe?

Title:
Gravity and magnetic surveys over the Santa Rita fault system, southeastern Arizona
Abstract:
Gravity station data and hand-held magnetometer measurements with analysis and description of methodology.
  1. How might this data set be cited?
    Hegmann, Mary, 2001, Gravity and magnetic surveys over the Santa Rita fault system, southeastern Arizona: Open-File Report 01-503, Geological Survey (U.S.), Tucson, Arizona.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -110.855617
    East_Bounding_Coordinate: -110.805267
    North_Bounding_Coordinate: 31.908967
    South_Bounding_Coordinate: 31.876317
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: Oct-1997
    Ending_Date: May-2000
    Currentness_Reference:
    Field measurements made during this time period
  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 Point data set. It contains the following vector data types (SDTS terminology):
      • Entity point (1056)
    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 North American Datum of 1927.
      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?
    gravity.dbf
    Principal facts for gravity stations, Appendix A of the report
    STA
    Gravity station identification Textual identifier without substantial scientific significance
    LATITUDE
    Geographic latitude
    Range of values
    Minimum:31.87631700
    Maximum:31.90896700
    Units:decimal degrees
    LONGITUDE
    Geographic longitude
    Range of values
    Minimum:-110.8556170
    Maximum:-110.8052670
    Units:decimal degrees
    ELEV_UNITS
    Units of elevation
    ValueDefinition
    ffeet
    mmeters
    ELEVATION
    Elevation of surface at the site
    Range of values
    Minimum:993.930
    Maximum:3353.000
    Units:value of ELEV_UNITS
    OBS_GRAV
    Observed gravity
    Range of values
    Minimum:979114.150
    Maximum:979135.270
    Units:mGal
    FR_AIR_AN
    Free air anomaly
    Range of values
    Minimum:-36.240
    Maximum:-12.800
    Units:mGal
    BOUG_SIMP
    Simple Bouguer anomaly
    Range of values
    Minimum:-149.440
    Maximum:-137.040
    Units:mGal
    BOUG_COMPL
    Complete Bouguer anomaly
    Range of values
    Minimum:-149.700
    Maximum:-137.060
    Units:mGal
    IZT_CORR
    Inner terrain correction
    Range of values
    Minimum:0.000
    Maximum:0.130
    TOT_CORR
    Total terrain correction
    Range of values
    Minimum:0.730
    Maximum:1.550
    UNCER_CBGA
    Uncertainty in the complete Bouguer anomaly
    Range of values
    Minimum:0.150
    Maximum:1.020
    Units:mGal
    magnetic.dbf
    Handheld magnetometer measurements, Appendix B of the report
    STATION
    Unique identifier for the measurement station Textual identifier without substantial scientific significance
    EASTING_M
    East-west coordinate in UTM zone 12N, NAD27
    Range of values
    Minimum:515345.20
    Maximum:518425.90
    Units:meters
    NORTHING_M
    North-south coordinate in UTM zone 12N, NAD27
    Range of values
    Minimum:3528497.60
    Maximum:3530169.90
    Units:meters
    AVE_NT
    Reading average
    Range of values
    Minimum:48588.10
    Maximum:48945.20
    Units:nanoTeslas
    CORR_SRA01
    Reading corrected for diurnal variation to base station sra-01
    Range of values
    Minimum:0.00
    Maximum:48943.20
    Units:nanoTeslas
    IGRF_NT
    IGRF reference field value
    Range of values
    Minimum:48949.40
    Maximum:48956.30
    Units:nanoTeslas
    CORR_IGRF
    Anomaly calculated with respect to IGRF value
    Range of values
    Minimum:-365.20
    Maximum:-8.00
    Units:nanoTeslas
    COMMENTS
    Additional information about the station
    ValueDefinition
    5m from fence 
    7m from steel post 
    <25m from fence 
    sra-17 
    srb-0 
    src-54 
    sre-0 
    parallel to fence, ~10m to S 
    Primary base 

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Hegmann, Mary
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    Mark E Gettings
    USGS WR SW GD
    Research Geophysicist
    520 N. Park Avenue
    Tucson, AZ
    USA

    520-670-5507 (voice)
    520-670-5571 (FAX)
    mgetting@usgs.gov

Why was the data set created?

Gravity and magnetic surveys were performed in the northeast portion of the Santa Rita Experimental Range, in southeastern Arizona, to identify faults and gain a better understanding of the subsurface geology

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  3. What similar or related data should the user be aware of?

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

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)
    USGS Information Services
    Box 25286, Denver Federal Center
    Denver, Colorado
    USA

    1-888-ASK-USGS (voice)
    1-303-202-4695 (FAX)
    infoservices@usgs.gov
  2. What's the catalog number I need to order this data set? USGS Open-File Report 01-503
  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 (or with the North American Stratigraphic Code). Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 14-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:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://geo-nsdi.er.usgs.gov/metadata/open-file/01-503/metadata.faq.html>
Generated by mp version 2.9.48 on Tue Jul 03 20:06:03 2018