08034_BOOMERPROFILES: High-Resolution Seismic-Reflection Boomer Profiles in SEG-Y and JPEG Formats From Cruise RAFA08034 off Edgartown, Massachusetts

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Frequently-anticipated questions:


What does this data set describe?

Title:
08034_BOOMERPROFILES: High-Resolution Seismic-Reflection Boomer Profiles in SEG-Y and JPEG Formats From Cruise RAFA08034 off Edgartown, Massachusetts
Abstract:
The U.S. Geological Survey (USGS), in cooperation with the National Oceanic and Atmospheric Administration (NOAA) and the Massachusetts Office of Coastal Zone Management (MA CZM), is producing detailed geologic maps of the coastal sea floor. Imagery, originally collected by NOAA for charting purposes, provides a fundamental framework for research and management activities along this part of the Massachusetts coastline, shows the composition and terrain of the seabed, and provides information on sediment transport and benthic habitat. Interpretive data layers were derived from the combined single-beam and multibeam echo-sounder data and sidescan-sonar data collected in the vicinity of Edgartown Harbor, Massachusetts. During August 2008 seismic-reflection profiles (Boomer and Chirp) were acquired, and during September 2008 bottom photographs and surficial sediment data were acquired as part of two ground-truth reconnaissance surveys.
  1. How should this data set be cited?

    Poppe, Larry, 2009, 08034_BOOMERPROFILES: High-Resolution Seismic-Reflection Boomer Profiles in SEG-Y and JPEG Formats From Cruise RAFA08034 off Edgartown, Massachusetts: Open-File Report 2009-1001, U.S. Geological Survey, Coastal and Marine Geology Program, USGS Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    This is part of the following larger work.

    Poppe, L.J., McMullen, K.Y., Foster, D.S., Blackwood, D.S., Williams, S.J., Ackerman, S.D., Moser, M.S., and Glomb, K.A., 2010, Geological Interpretation of the Sea Floor Offshore of Edgartown, Massachusetts: Open-File Report 2009-1001, U.S. Geological Survey, Coastal and Marine Geology Program, USGS Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -70.548292
    East_Bounding_Coordinate: -70.434536
    North_Bounding_Coordinate: 41.454708
    South_Bounding_Coordinate: 41.385917

  3. What does it look like?

    <https://pubs.usgs.gov/of/2009/1001/data/seismic/boomer/gif_files/line-0001.gif> (GIF)
    Browse graphic showing boomer high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    <https://pubs.usgs.gov/of/2009/1001/data/seismic/boomer/gif_files/line-0002.gif> (GIF)
    Browse graphic showing boomer high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    <https://pubs.usgs.gov/of/2009/1001/data/seismic/boomer/gif_files/line-0003.gif> (GIF)
    Browse graphic showing boomer high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    <https://pubs.usgs.gov/of/2009/1001/data/seismic/boomer/gif_files/line-0004.gif> (GIF)
    Browse graphic showing boomer high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.
    <https://pubs.usgs.gov/of/2009/1001/data/seismic/boomer/gif_files/line-0004.gif> (GIF)
    Browse graphic showing boomer high-resolution seismic-reflection profiles collected during RV Rafael cruise 08034.

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

    Calendar_Date: 20-Aug-2008
    Currentness_Reference: ground condition

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

    Geospatial_Data_Presentation_Form: SEG-Y and JPEG

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Raster data set. It contains the following vector data types (SDTS terminology):

      • Entity point (0)

    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 0.000003. Longitudes are given to the nearest 0.000003. Latitude and longitude values are specified in seconds of arc.

      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:
      Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 0.001
      Depth_Distance_Units: milliseconds
      Depth_Encoding_Method: Implicit coordinate

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    This data set includes boomer seismic-reflection data in SEG-Y and JPEG formats collected along 5 lines in the vicinity of Edgartown, offshore Massachusetts. The seismic data were collected during USGS survey 08034, conducted August 18-20, 2008. Each profile is available as a binary file in Society of Exploration Geophysicists SEG-Y rev 1 format. A SEG-Y file consists of 1) a 3200-byte file identification record of EBCDIC encoded general information; 2) a 400-byte binary record with information such as sample rate and record length specific to the data set; and 3) multiple records, one seismic reflection trace per record. Each trace record is preceded by a 240-byte "trace header" containing information such as trace number and acquisition day and time specific to each trace. The trace data are represented as a time series of unitless 32-bit IEEE real numbers proportional to the reflection coefficient. The SEG-Y file is useful only if you have access to specialized software designed to process and display seismic reflection data.
    Entity_and_Attribute_Detail_Citation: <http://www.seg.org/publications/tech-stand/seg_y_rev1.pdf>


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?

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

    Larry Poppe
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    508-548-8700 x2314 (voice)
    508-457-2310 (FAX)
    lpoppe@usgs.gov


Why was the data set created?

To release the Boomer seismic profiles collected to ground-truth acoustic data (combined single-beam and multibeam bathymetry and sidescan-sonar imagery) collected during NOAA hydrographic survey H11346. The Boomer data were collected to interpret the deeper stratigraphy beneath Edgartown Harbor.


How was the data set created?

  1. From what previous works were the data drawn?

    (source 1 of 1)

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

    Date: 20-Aug-2008 (process 1 of 2)
    High-resolution Boomer seismic-reflection data were collected August 20 aboard the Research Vessel Rafael. The seismic data were acquired digitally along 5 lines totaling approximately 27.6 km with a GeoAcoustics Boomer source, GeoAcoustics power supply, Benthos AQ4 single-channel streamer, and Chesapeake Systems SonarWiz v4.03.0089 acquisition software. The Boomer was fired at a rate of 0.5 seconds at a power output of 175 joules. The received signal was filtered between 100-3000 Hz with a Geopulse receiver. The trace data recorded for 266 ms with a sample rate of 0.533 ms in standard SEG-Y format.

    Person who carried out this activity:

    David Foster
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    508-548-8700 x2271 (voice)
    508-457-2310 (FAX)
    dfoster@usgs.gov

    Date: 21-Aug-2008 (process 2 of 2)
    A Unix shell script was run that used Seismic Unix v4.0 to read the SEG-Y files and plot the data as 8-bit gray scale Postscript files using the Seismic Unix 'psimage' algorithm at a scale of 4.16 ms per inch and 100 traces per inch. The Postscript images were then converted to JPEG format with Imagemagick 5.5.6

    Person who carried out this activity:

    David Foster
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    508-548-8700 x2271 (voice)
    508-457-2310 (FAX)
    dfoster@noaa.gov

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

    O'Hara, C.J., and Oldale, R.N., 1987, Maps showing the geology, shallow structure, and bedform morphology of Nantucket Sound, Massachusetts: Miscellaneous Field Studies Map MF-1911, U.S. Geological Survey, Coastal and Marine Geology Program, USGS Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Poppe, L.J., McMullen, K.Y., Foster, D.S., Blackwood, D.S., Williams, S.J., Ackerman, S.D., Barnum, S.R., and Brennan, R.T., 2008, Sea-floor character and sedimentary processes in the vicinity of Woods Hole, Massachusetts: Open-File Report 2008-1004, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Coastal and Marine Science Center, Woods Hole, MA.

    Online Links:

    SEG Technical Standards Committee, 2002, SEG Y rev 1 Data Exchange format: Society of Exploration Geophysicists.

    Online Links:


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?

    Horizontal_Positional_Accuracy_Report: Navigation was by DGPS; positional accuracy to less than 10 m. The Boomer source was towed astern and to the port side of the RV Rafael on the water surface. The single-channel hydrophone streamer was towed astern and to the starboard side and approximately 0.5 meters below the water surface. The layback offset was accounted for in the positional data recorded in the SEG-Y headers. The layback position was 8 meters aft of the vessel.

  3. How accurate are the heights or depths?

    The vertical position was local sea level and there have been no corrections to a datum or for tidal variations.

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

    All available Boomer data along seismic acquisition lines collected during the RV Rafael cruise 08034 is included in this data set.

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

    No additional checks for consistency were performed on this data.


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:
Public domain data from the U.S. Government are freely redistributable with proper metadata and source attribution. Please recognize the U.S. Geological Survey (USGS) as the source of this information.

  1. Who distributes the data set? (Distributor 1 of 1)

    Larry Poppe
    U.S. Geological Survey
    Geologist
    384 Woods Hole Road
    Woods Hole, MA 02543
    USA

    508-548-8700 x2314 (voice)
    508-457-2310 (FAX)
    lpoppe@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?

    Neither the U.S. Government, the Department of the Interior, nor the USGS, nor the National Oceanic and Atmospheric Administration (NOAA), nor any of their employees, contractors, or subcontractors, make any warranty, express or implied, nor assume any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, nor represent that its use would not infringe on privately owned rights. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the USGS or NOAA in the use of these data or related materials. 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?

  5. What hardware or software do I need in order to use the data set?

    Use of SEG-Y data requires specialized software capable of reading SEG-Y standard files. The user must have software capable of viewing standard JPEG files.


Who wrote the metadata?

Dates:
Last modified: 31-Aug-2009
Metadata author:
David Foster
U.S. Geological Survey
Geologist
384 Woods Hole Road
Woods Hole, MA 02543
USA

508-548-8700 x2271 (voice)
508-457-2310 (FAX)
dfoster@usgs.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Generated by mp version 2.9.6 on Mon Aug 31 13:33:30 2009