U.S. Geological Survey

Faults of the Caribbean Region (flt6bg)

Faults of the Caribbean Region (flt6bg)

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Frequently-anticipated questions:


What does this data set describe?

    Title: Faults of the Caribbean Region (flt6bg)
    Abstract:
    This dataset describes faults and structural features of the Caribbean region (Anguilla, Antigua and Barbuda, Aruba, Bahamas, Barbados, Belize, British Virgin Islands, Cayman Islands, Colombia, Costa Rica, Cuba, Dominica, Dominican Republic, El Salvador, Grenada, Guadeloupe, Guatemala, Guyana, Haiti, Honduras, Jamaica, Martinique, Mexico, Montserrat, Netherlands Antilles, Nicaragua, Panama, Puerto Rico, St. Kitts and Nevis, St. Lucia, St. Vincent and the Grenadines, Trinidad and Tobago, Turks and Caicos Islands, United States, Venezuela, and the Virgin Islands (named countries may not be completely shown on map)).
    Supplemental_Information:
    In many offshore areas and in some onshore areas, faults shown are based on subsurface drill or seismic data and may not reach the surface.

    Offshore structural features are interpreted from a combination of seismic reflection data and analysis of bathymetric features. Where track control is sparse, structural features have been plotted approximately normal to track direction. Thus, true strikes of structural features may vary considerably from those shown on map.

  1. How should this data set be cited?

    Christopher D. French and Christopher J. Schenk, USGS, Denver, CO, 20040000, Faults of the Caribbean Region (flt6bg): U.S. Geological Survey, Central Energy Resources Team, Denver, Colorado.

    Online Links:

    This is part of the following larger work.

    Christopher D. French and Christopher J. Schenk, USGS, Denver, CO, 20040000, Open-File Report 97-470-K "Map Showing Geology, Oil and Gas Fields, and Geologic Provinces of the Caribbean Region": U.S. Geological Survey Open-File Report OFR-97-470-K, U.S. Geological Survey, Central Energy Resources Team, Denver, Colorado, USA.

    Online Links:

    Other_Citation_Details:
    Open File Report 97-470-K is one of a series of continental-scale geologic maps of the world being published on CD-ROM by the U.S. Geological Survey World Energy Project.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -93.015633
    East_Bounding_Coordinate: -58.475106
    North_Bounding_Coordinate: 28.000000
    South_Bounding_Coordinate: 7.026141

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Calendar_Date: 2003
    Currentness_Reference: publication date

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: Downloadable GIS Data

  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):

      • String (5942)

    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 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257224.

      Vertical_Coordinate_System_Definition:
      Altitude_System_Definition:

  7. How does the data set describe geographic features?

    Faults
    Feature Class Attribute Table (Source: None)

    Shape_Length
    Length of feature in internal units. (Source: ESRI)

    Positive real numbers that are automatically generated.

    Code
    Fault Type Code (Source: User Defined)

    ValueDefinition
    FDTFault - downthrown
    FDTAFault - downthrown - approximated
    FUFault - displacement unknown
    FUAFault - displacement unknown - approximated
    FUSFault - displacement unknown - speculative
    IZUInferred zone of underthrusting
    RTFFault - reverse or thrust
    RTFAFault - reverse or thrust - approximated or inferred
    SSTFStrike slip or transform fault
    SSTFAStrike slip or transform fault - approximated or inferred

    Description
    Fault Description (Source: User Defined)

    ValueDefinition
    Fault - downthrown - approximatedNormal fault, downthrown
    Fault - downthrown - approximatedNormal fault, downthrown, location approximated
    Fault - displacement unknownNormal fault, displacement unknown
    Fault - displacement unknown - approximatedNormal fault, displacement unknown, location approximated
    Fault - displacement unknown - speculativeNormal fault, displacement unknown, location speculative
    Inferred zone of underthrustingInferred zone of underthrusting
    Fault - reverse or thrustReverse or thrust fault
    Fault - reverse or thrust - approximated or inferredReverse or thrust fault, location approximated or inferred
    Strike slip or transform faultStrike-slip or transform fault
    Strike slip or transform fault - approximated or inferredStrike-slip or transform fault, location approximated or inferred


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

    Scanning of source map, georeferencing, digitizing, attributing, editing and preparation of geodatabase feature class - Christopher D. French

    Metadata Creation - Christopher D. French

    Project coordination - Christopher J. Schenk

  3. To whom should users address questions about the data?

    Christopher D. French
    U.S. Geological Survey, Central Energy Resources Team
    GIS Specialist
    U.S. Geological Survey, Box 25046, MS 939, Denver Federal Center
    Denver, Colorado 80225-0046
    USA

    303-236-1655 (voice)
    303-236-0459 (FAX)
    chfrench@usgs.gov


Why was the data set created?

To delineate geologic structural features and fault types in Open File Report 97-470-K Map Showing Geology, Oil and Gas Fields, and Geologic Provinces of the Caribbean Region, which was compiled as a reference for the U.S. Geological Survey World Energy Project assessment of undiscovered, technically recoverable oil and gas resources of the world. This dataset was used to produce maps in both ESRI ArcMap 8.3 and Adobe Acrobat PDF formats. Files were exported from geodatabase feature class to ESRI shapefile and ArcInfo export formats for use in other applications.


How was the data set created?

  1. From what previous works were the data drawn?

    USGS (source 1 of 2)
    J.E. Case and T.L. Holcombe, 1980, Geologic-Tectonic Map of the Caribbean Region: Miscellaneous Investigations Series Map I-1100, USGS, Reston, VA.

    Online Links:

    • N/A

    Other_Citation_Details:
    Prepared in cooperation with the United States Naval Oceanographic Office and the United States Naval Ocean Research and Development Activity.
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 2500000
    Source_Contribution: Geologic contacts and ages.

    NIMA (source 2 of 2)
    National Imagery and Mapping Agency, 1997, VMAP_1V10-Vector map Level 0 (Digital chart of the World).

    Other_Citation_Details: Can be found on USGS DDS-62-A (POLBNDA.shp)
    Type_of_Source_Media: CD-ROM
    Source_Scale_Denominator: 1000000
    Source_Contribution: Used as a general guide for georeferencing.

  2. How were the data generated, processed, and modified?

    Date: Jun-2002 (process 1 of 5)
    USGS maps were scanned at 300 dpi resolution and RGB color setting.

    Data sources used in this process:

    • USGS

    Date: Jun-2002 (process 2 of 5)
    USGS source maps merged in Adobe Photoshop 6.0.

    Data sources used in this process:

    • USGS

    Date: Jun-2002 (process 3 of 5)
    Scanned source maps were registered using georeferencing tools in ArcGIS 8.3, and NIMA country boundary shapefile as a guide.

    Data sources used in this process:

    • USGS
    • ESRI

    Date: Mar-2003 (process 4 of 5)
    Geologic contacts were digitized on screen as a personal geodatabase feature class using scanned and referenced image as a guide.

    Date: Jan-2003 (process 5 of 5)
    Geodatabase coded domains established to attribute feature class. Codes and descriptions used original source map legend as a guide. Some descriptions abbreviated.

  3. What similar or related data should the user be aware of?


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

  1. How well have the observations been checked?

    Scanned source maps used as a reference for attributing.

  2. How accurate are the geographic locations?

    Horizontal positional accuracy was not formally quantified. Some details about the scanning and referencing process along with errors are stated below.

    1) Original source map was provided in two plates at a scale of 1:2,500,000. Each plate was scanned at 300 dpi in RGB color mode. Adobe Photoshop 6.0 was used to merge east and west images together at edges. Some discrepancies were noticed on edge match. Edge mismatch was no greater than 500 m in a few areas, while good matches were found elsewhere. Discrepancies were averaged while digitizing.

    2) A vector dataset orginating from the National Imagery and Mapping Agency (NIMA) Digital Chart of the World (DCW) series was available for georeferencing. This dataset is known to have a nominal scale of 1:1,000,000 and was available as a shapefile from the United States Geological Survey, Digital Data Series DDS-62-A Global GIS Database: Digital Atlas of Central and South America.

    3) ArcMap 8.3 georeferencing tool was used to establish control points and reference merged image. Original maps were provided in Mercator projection with true scale at 19 degrees north latitude. Attempts were made to transform the reference shapefile to the stated projection for georeferencing, but major errors existed along southern edges of map. A geographic coordinate system (WGS_1984) was used with more success. 57 control points were established to perform a 3rd order polynomial transformation. Other transformation methods were attempted along with other control point placement, but resulted in more error. A root mean square (RMS) error of 1611.8 m was recorded.

    4) Discrepancies were anticipated between source map shorelines and country boundaries because of scale difference. Other distortions may have been inherent in the source maps. Overall dimensions of map fit well at desired display scale of 1:2,500,000. Discrepancies in shoreline were random and variable, rarely exceeding 3,500 m.

  3. How accurate are the heights or depths?

    N/A

  4. Where are the gaps in the data? What is missing?

    Complete

  5. How consistent are the relationships among the observations, including topology?

    Line topology exists. Snapping to geologic contacts used while digitizing. Geodatabase coded domains used for attributing. To and from node direction indicates downthrown side of fault.


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 80225
    USA

    1-888-ASK-USGS (voice)
    303.202.4693 (FAX)
    ask@usgs.gov

  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    This pubilication was prepared by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed in this report, or represents that its use would not infringe privately owned rights. Reference therein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.

    Although all data and software published on this CD-ROM are used by the U.S. Geological Survey, no warranty, expressed or implied, is made by the U.S. Geological Survey as to the accuracy of the data and related materials and (or) the functioning of the software. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the U.S. Geological Survey in the use of these data, software, or related materials.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 15-Mar-2004
Last Reviewed: 2004

Metadata author:
Christopher French
U.S. Geological Survey, Central Energy Resources Team, Data Management Project
GIS Specialist
U.S. Geological Survey, Box 25046, MS 939, Denver Federal Center
Denver, Colorado 80225
USA

303-236-1655 (voice)
datamgt@usgs.gov

Contact_Instructions:
For inquiries regarding this document, please include the metadata contact person's name, dataset name, and publication series and number.
Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)

Metadata extensions used:


Generated by mp version 2.7.33 on Wed May 26 15:30:37 2004
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