Archive of Digital Boomer Seismic Reflection Data Collected Offshore Northeast Florida during USGS Cruise 02FGS01 in October 2002

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Frequently anticipated questions:

What does this data set describe?

Archive of Digital Boomer Seismic Reflection Data Collected Offshore Northeast Florida during USGS Cruise 02FGS01 in October 2002
In October of 2002, the U.S. Geological Survey (USGS), in cooperation with the Florida Geological Survey (FGS), conducted a geophysical survey of the Atlantic Ocean offshore Nassau and Duval Counties in northeast Florida, from the northern tip of Amelia Island to Jacksonville Beach. This report serves as an archive of unprocessed digital boomer seismic reflection data, trackline maps, navigation files, GIS files, and formal Federal Geographic Data Committee (FGDC) metadata. Filtered and gained digital images of the seismic profiles are also provided. The archived trace data are in standard Society of Exploration Geophysicists SEG Y format (rev. 0) (Barry and others, 1975) and may be downloaded and processed with commercial or public domain software such as Seismic Unix (SU). Example SU processing scripts and USGS software for viewing the SEG Y files (Zihlman, 1992) are also provided. These data are also available for viewing using GeoMapApp ( and Virtual Ocean ( multi-platform open source software. In addition, the SEG Y files can also be downloaded from the USGS Coastal and Marine Geoscience Data System (
The USGS St. Petersburg Coastal & Marine Science Center (SPCMSC) in Florida assigns a unique identifier to each cruise or field activity. For example, 02FGS01 tells us the data were collected in 2002 as part of cooperative work with the Florida Geological Survey and the data were collected during the first field activity for that project in that calendar year. Refer to for a detailed description of the method used to assign the cruise or field activity ID. The naming convention used for each seismic line is as follows: yye##a, where 'yy' are the last two digits of the year in which the data were collected, 'e' is a one-letter abbreviation for the equipment type (for example, b for boomer), '##' is a two-digit number representing a specific track, and 'a' is a letter representing the section of a line if recording was prematurely terminated or rerun for quality or acquisition problems. The boomer plate is an acoustic energy source that consists of capacitors charged to a high voltage and discharged through a transducer in the water. The transducer is towed on a sled at the sea surface and when discharged emits a short acoustic pulse, or shot, that propagates through the water and sediment column. The acoustic energy is reflected at density boundaries (such as the seafloor or sediment layers beneath the seafloor), detected by the receiver, and recorded by a PC-based seismic acquisition system. This process is repeated at timed intervals (for example, 0.5 seconds) and recorded for specific intervals of time (for example, 100 milliseconds). In this way, a two-dimensional (2-D) vertical image of the shallow geologic structure beneath the ship track is produced. An EG&G GeoPulse power supply provided 175 joules per shot. Reflected energy was received by an Innovative Transducers, Inc. (ITI) ST-5 10-channel streamer and recorded by Triton Elics International, Inc. (TEI) Delph Seismic acquisition software. The streamer contains 10 hydrophones evenly spaced every 2 feet. However, only phones 3-8 were used. The streamer was positioned parallel to the boomer sled and laterally separated from it by 7 meters. Please refer to figure 1 ( for a diagram of the acquisition geometry. The sample frequency of the data is 24 kilohertz, the record length is 100-120 milliseconds, and the shot rate was every 0.5 seconds. Shot spacing was approximately every 1 meter. The binary portion of the unprocessed seismic data is stored in SEG Y (rev. 0), integer, Motorola format, which is a standard digital format that can be read and manipulated by most seismic processing software packages (Barry and others, 1975), with the exception of the first 3,200 bytes of the card image header, which is stored in comma delimited ASCII format instead of the standard EBCDIC format. The SEG Y formatted trace files have a .tra extension. Additional recording parameters for each trace file can also be found in the .par file associated with each .tra file. However, the .par and .pln files included here are only needed to process or display the data with TEI Delph Seismic software. The SEG Y files may be downloaded and processed with commercial or public domain software such as Seismic Unix (SU) (Cohen and Stockwell, 2005). Also provided are example SU scripts that allow the user to strip off navigation fixes from the SEG Y headers, along with a fix for every 500 shots, and produce a printable, gained GIF image of each profile. The printable profiles provided here are GIF images that were filtered and gained using SU software. Refer to the Software page for links to example SU processing scripts and USGS software for viewing the SEG Y files (Zihlman, 1992).
  1. How might this data set be cited?
    Subino, Janice A., Forde, Arnell S., Dadisman, Shawn V., Wiese, Dana S., Calderon, Karynna, U.S. Geological Survey, and Survey, Florida Geological, 2012, Archive of Digital Boomer Seismic Reflection Data Collected Offshore Northeast Florida during USGS Cruise 02FGS01 in October 2002: U.S. Geological Survey Data Series 653, U.S. Geological Survey, St. Petersburg, Fla..

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -81.385742
    East_Bounding_Coordinate: -81.210992
    North_Bounding_Coordinate: 30.694746
    South_Bounding_Coordinate: 30.271885
  3. What does it look like? (JPEG)
    Trackline map of digital boomer seismic reflection data collected during USGS cruise 02FGS01. This map is in geographic coordinates (NAD83, unprojected) and was created at a scale of 1:200,000. Refer to the Lineage section below for the trackline map creation process.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 22-Oct-2002
    Ending_Date: 28-Oct-2002
    Data collection interval
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Multimedia presentation
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Horizontal X and Y locations (latitude and longitude and Zone 17N UTM coordinates) for each shot are provided as comma delimited ASCII text files, along with the date and time (Greenwich Mean Time) the shot was recorded.
    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 0.0000027. Longitudes are given to the nearest 0.0000027. Latitude and longitude values are specified in decimal degrees. The horizontal datum used is WGS84.
      The ellipsoid used is WGS84.
      The semi-major axis of the ellipsoid used is 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222101000020000.
  7. How does the data set describe geographic features?
    02fgs01.txt and s02fgs01.txt
    Shotpoint navigation files (Source: Society of Exploration Geophysicists SEG Y headers (
    Internal feature number. (Source: ESRI) Sequential unique whole numbers that are automatically generated.
    Feature geometry. (Source: ESRI) Coordinates defining the features.
    Longitude (decimal degrees) (Source: WGS84)
    Range of values
    Latitude (decimal degrees) (Source: WGS84)
    Range of values
    Trackline number (Source: User defined field describes the trackline number.)
    Range of values
    Shotpoint number (Source: User defined field describes the shotpoint number.)
    Range of values
    UTM-X coordinate (Zone 17N) (Source: Universal Transverse Mercator Geographic Coordinate System)
    Range of values
    UTM-Y coordinate (Zone 17N) (Source: Universal Transverse Mercator Geographic Coordinate System)
    Range of values
    Year of Seismic Reflection Survey (Source: Calendar year for the United States)
    Formal codeset
    Codeset Name:2002
    Codeset Source:Gregorian Calendar System
    day of year:hour:minute:second (Source: Coordinated Universal Time) day of year, hour, minute and second of data acquisition
    Binary data file: Trace data are available as binary files in SEG Y format. These files have a .tra extension and measure 1.5 - 134.6 Megabytes.
    Graphic image file: Printable profiles are available as GIF images. The trackline map is a JPEG image. The trackline map contains links to the seismic printable profile GIF images.
    Navigation file: Navigation files are available as comma delimited ASCII text files. Provided are raw (unprocessed) shotpoint navigation files (02b01.txt - 02b50.txt), processed shotpoint navigation file (02fgs01.txt), and processed 500-shot-interval location file (s02fgs01.txt). Fields/Attributes [FID, Shape] marked above with an asterisk (*) were created by ESRI ArcGIS files and are used exclusively by the shapefiles created from the aforementioned .txt files; these fields are not included in the original navigation files. All remaining attributes listed in the above section that do not have an accompanying asterisk are found in 02fgs01.txt and s02fgs01.txt. The raw navigation files contain the same attributes as the processed navigation minus the latitude and longitude coordinates.
    GIS files file: The GIS files project used to create the trackline maps is provided as a .zip file composed of ESRI map documents, shapefiles, and metadata.
    Barry, K.M., Cavers, D.A., and Kneale, C.W., 1975, Recommended standards for digital tape formats: Geophysics, v. 40,no. 2, p. 344-352. Available online at
    Cohen, J.K., and Stockwell, J.W., Jr., 2005, CWP/SU: Seismic Unix Release 39: A free package for seismic research and processing: Golden, Colo., Center for Wave Phenomena, Colorado School of Mines. Available online at
    Zihlman, F.N., 1992, DUMPSEGY V1.0: A program to examine the contents of SEG Y disk-image seismic data: U.S.Geological Survey Open-File Report 92-590, 28 p. Available online at
    Disc Image Credit: Descloitres, J., MODIS Land Rapid Response Team at the NASA Goddard Space Flight Center, 2003, Florida.A2003044.jpg. Available online at

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Janice A. Subino
    • Arnell S. Forde
    • Shawn V. Dadisman
    • Dana S. Wiese
    • Karynna Calderon
    • U.S. Geological Survey
    • Florida Geological Survey
  2. Who also contributed to the data set?
    Funding and (or) support for this study was provided by the USGS CMGP and the FGS. We thank R/V Geoquest captain Ted Kiper, mate Wade Stringer, and Daniel Phelps of the FGS for their assistance in data collection. This document was improved by the reviews of Noreen Buster (USGS - St. Petersburg, Fla.) and Kyle Kelso (contracted with Jacobs Technology, Inc., at the USGS - St. Petersburg, Fla.).
  3. To whom should users address questions about the data?
    Arnell Forde
    U.S. Geological Survey
    600 4th Street South
    St. Petersburg, Fla.

    (727) 502-8111 (voice)

Why was the data set created?

To archive all digital boomer seismic reflection data and associated files collected during cruise 02FGS01.

How was the data set created?

  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
    Date: 2003 (process 1 of 6)
    Boomer processing: The SEG Y data were processed with Seismic Unix software to produce the GIF seismic profile images included in this report. A representative boomer processing sequence consisted of (1) running a bandpass filter of 300-500 to 2500-3000 Hertz, (2) applying automatic gain control, (3) displaying PostScript, and (4) converting of PostScript image to a GIF image.
    Date: 2004 (process 2 of 6)
    Navigation processing: Shotpoint navigation, start of line, and 500-shot-interval location files were extracted from the trace headers of each line using Seismic Unix software and edited to remove spurious data points. They were then processed with PROJ.4 software ( to generate UTM coordinates from latitude and longitude coordinates. Text files for each seismic line were concatenated into two comma-delimited text files (for use with ESRI software), one containing unique shotpoint positions (02fgs01.txt) and another containing the 500-shot-interval locations (s02fgs01.txt); both can be viewed within the nav folder.
    Date: 2004 (process 3 of 6)
    Trackline map creation: The trackline map and shapefiles provided in this archive was created using ESRI ArcGISfiles version 8.3 software, exported to Adobe Illustrator for further editing, and saved in JPEG format. The map is unprojected (geographic coordinates, NAD83). The cities layer is a St. Johns River Water Management District (SJRWMD) dataset. The counties layer is a USGS/SJRWMD dataset. The USGS is the originator of all other layers.
    Date: 2004 (process 4 of 6)
    Data Series preparation: In addition to the process steps described above, the following steps were taken to produce this Data Series: the handwritten logs were scanned and saved as PDF files, digital FACS logs were created using the handwritten logs and personal accounts of the crew members and saved as PDF files, and an HTML-based format was used to present the various parts of this archive.
    Date: 24-Jan-2017 (process 5 of 6)
    Keywords section of metadata optimized for discovery in USGS Coastal and Marine Geology Data Catalog. Person who carried out this activity:
    U.S. Geological Survey
    Attn: Alan O. Allwardt
    Contractor -- Information Specialist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7551 (voice)
    831-427-4748 (FAX)
    Date: 13-Oct-2020 (process 6 of 6)
    Added keywords section with USGS persistent identifier as theme keyword. Person who carried out this activity:
    U.S. Geological Survey
    Attn: VeeAnn A. Cross
    Marine Geologist
    384 Woods Hole Road
    Woods Hole, MA

    508-548-8700 x2251 (voice)
    508-457-2310 (FAX)
  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?
    The validity or accuracy of marine seismic reflection profiles is highly qualitative and depends on equipment and operating condition variables. Visual inspection of the images rendered from the data did not show any major anomalies.
  2. How accurate are the geographic locations?
    As the seismic reflection data were acquired, the position of the vessel was continuously determined by a CSI Wireless DGPS Max DGPS receiver, which is accurate to 3 meters. Positions were recorded and written to the trace headers in Zone 17N UTM coordinates about every 1 second. The navigation data have not been corrected to reflect the approximately 30-meter offset between the shotpoint and GPS antenna.
  3. How accurate are the heights or depths?
    Boomer data are relative to sea level. However, varying recorded static shifts of the data have been known to occur. Therefore, these data are not to be used for bathymetry.
  4. Where are the gaps in the data? What is missing?
    These data are collected along two-dimensional (2-D) tracklines and are therefore inherently incomplete. Geologic details between lines must be inferred. No digital data were collected for line 02b42. Navigation is intermittent for several lines. On the trackline map, the location of missing navigation data within a line is inferred by linear interpolation of the first and last known data points, and large gaps of 700 shots or more are represented by a dashed yellow line.
  5. How consistent are the relationships among the observations, including topology?
    This dataset is from one field activity with consistent instrument calibrations.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints: None. These data are held in the public domain.
The U.S. Geological Survey and the Florida Geological Survey request to be acknowledged as originators of the data in future products or derivative research.
  1. Who distributes the data set? (Distributor 1 of 1)
    Arnell Forde
    the U.S. Geological Survey
    600 4th Street South
    St. Petersburg, Fla.

    (727) 502-8111 (voice)
    All of this report is available on-line. However, the SEG Y files are only downloadable from the Coastal and Marine Geoscience Data System (
  2. What's the catalog number I need to order this data set? U.S. Geological Survey Data Series 653
  3. What legal disclaimers am I supposed to read?
    This DVD publication was prepared by an agency of the United States Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data on any other system, nor shall the act of distribution imply any such warranty. The U.S.Geological Survey shall not be held liable for improper or incorrect use of the data described and (or) contained herein. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof.
  4. How can I download or order the data?
    • Availability in digital form:
      Data format: The SEG Y files on this disc conform to the SEG Y standard format (Barry and others, 1975), with the exception of the 3,600-byte reel identification header that is in ASCII format. Standard SEG Y uses an EBCDIC 3,600-byte reel identification header. in format SEG Y (rev. 0) Size: 2430
      Media you can order: DVD (format ISO 9660)
      Note: UNIX, Linux, DOS, Mac OSX
      Data format: The GIS project used to create the trackline maps is composed of map documents, shapefiles, and metadata. Map documents were created using ESRI ArcGIS version 8.3 software. Shapefiles provided may be viewed using other versions of ArcGIS, ArcView, or public domain software ArcExplorer ( The data is also available for viewing using GeoMapApp ( and Virtual Ocean ( multi-platform open source software. in format map document, shapefile, metadata Size: 25
      Network links:
      Data format: The SEG-Y standard format (Barry et al., 1975) consists of the following: a 3,600-byte reel identification header with the first 3,200 bytes consisting of an ASCII header block and a 400-byte binary header block that both include information specific to line and reel number, a trace data block that follows the reel identification header with the first 240 bytes of each trace block consisting of the binary trace identification header, and seismic data samples that follow the trace identification header. in format SEGY data download Size: 15560
      Network links:
    • Cost to order the data: Free if obtained online; otherwise, prices vary.

    • Special instructions:
      Publications are available from USGS Information Services, Box 25286, Federal Center, Denver, Colo. 80225-0046 (telephone: 1-888-ASK-USGS, e-mail:
  5. What hardware or software do I need in order to use the data set?
    Use of SEG Y data requires specialized seismic processing software, such as public domain software Seismic Unix (

Who wrote the metadata?

Last modified: 13-Oct-2020
Metadata author:
Janice Subino
Jacobs Technology, Inc.
Media Specialist II
the U.S. Geological Survey, 600 4th Street South
St. Petersburg, Fla.

(727) 803-8747, ext. 3127 (voice)
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

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