Archive of boomer subbottom data collected offshore Eureka, California during USGS field activity W-1-96-NC from 1996-06-29 to 1996-07-07

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Frequently anticipated questions:

What does this data set describe?

Title:
Archive of boomer subbottom data collected offshore Eureka, California during USGS field activity W-1-96-NC from 1996-06-29 to 1996-07-07
Abstract:
This data release contains boomer subbottom data collected in June and July of 1996 on the shelf and slope offshore Eureka, California. Subbottom acoustic penetration spans up to several tens of meters, and is variable by location. This data release contains digital SEG-Y data. The data were collected aboard the R/V Wecoma using a Huntec Hydrosonde Deep-Tow system.
Supplemental_Information:
Additional information about the field activities from which these data were derived is available online at:
http://cmgds.marine.usgs.gov/fan_info.php?fan=1996-030-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
  1. How might this data set be cited?
    Balster-Gee, Alicia F., Hill, Jenna C., and O’Brien, Thomas F., 20200225, Archive of boomer subbottom data collected offshore Eureka, California during USGS field activity W-1-96-NC from 1996-06-29 to 1996-07-07: data release DOI:10.5066/P950276G, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -125.255
    East_Bounding_Coordinate: -124.14551
    North_Bounding_Coordinate: 41.1373
    South_Bounding_Coordinate: 39.91816
  3. What does it look like?
    https://cmgds.marine.usgs.gov/data-releases/media/2020/10.5066-P950276G/094b4e9245bf404aa708ffe563ba67ee/W196NC_indexmap.png (PNG)
    Index map of track lines
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 29-Jun-1996
    Ending_Date: 07-Jul-1996
    Currentness_Reference:
    ground condition at time data were collected
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: seismic-reflection data in SEG-Y format
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      Indirect_Spatial_Reference:
      Horizontal X and Y locations for the seismic profile locations are provided in ASCII position files and are stored in the SEG-Y data trace headers in header bytes 73 and 77.
    2. What coordinate system is used to represent geographic features?
      The map projection used is WGS 1984 UTM Zone 10N.
      Projection parameters:
      Scale_Factor_at_Central_Meridian: 0.9996
      Longitude_of_Central_Meridian: -123.0
      Latitude_of_Projection_Origin: 0.0
      False_Easting: 500000.0
      False_Northing: 0.0
      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.0001
      Ordinates (y-coordinates) are specified to the nearest 0.0001
      Planar coordinates are specified in Meter
      The horizontal datum used is D WGS 1984.
      The ellipsoid used is WGS 1984.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 0.1
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    Navigation and seismic shots with time stamp in standard SEG-Y file format
    Entity_and_Attribute_Detail_Citation:
    Society of Exploration Geophysicists (SEG) Technical Standards, available for download at http://seg.org/Publications/SEG-Technical-Standards]

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Alicia F. Balster-Gee
    • Jenna C. Hill
    • Thomas F. O’Brien
  2. Who also contributed to the data set?
    Affiliate investigators: Michael E. Field, James V. Gardner, and John Gann (all USGS)
  3. To whom should users address questions about the data?
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    Attn: PCMSC Science Data Coordinator
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

The U.S. Geological Survey (USGS) collected boomer subbottom profiles in the summer of 1996 offshore Eureka, California, as part of the STRATAFORM Project, which aimed to image the upper 100 meters of sediment and to determine architecture of depositional units along continental margins (Minasian and others, 2001). These data and information are intended for science researchers, students from elementary through college, policy makers, and general public.

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: 07-Jul-1996 (process 1 of 4)
    Boomer seismic-reflection data were obtained using a Huntec Deep Tow System. The Huntec Deep Tow System is a boomer mounted on a sled towed 25–100 m deep. The system has two receivers, an internal hydrophone and an external 10-element, 5-m hydrophone streamer. At the maximum energy of 550 J, the system produces a source bandwidth of ~0.6–6 kHz centered at 3.5 kHz. Data sources used in this process:
    • collection
    Date: 01-Feb-2019 (process 2 of 4)
    Boomer sub bottom profiles were processed using Echos by Paradigm seismic software. Channel 1 was used and the deep-water delay trace header values (byte 109 DWD) were applied and record length extended. UTM zone 10N navigation was written to header bytes 73 and 77. Data sources used in this process:
    • processing
    Date: 22-Apr-2020 (process 3 of 4)
    Corrections made to URLs in metadata, which were still pointing to the development site. No data were changed. (scochran@usgs.gov)
    Date: 19-Oct-2020 (process 4 of 4)
    Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. 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)
    vatnipp@usgs.gov
  3. What similar or related data should the user be aware of?
    Minasian, Diane L., Lee, Homa J., Locat, Jaques, Orzech, Kevin M., Martz, Gregory R., and Israel, Kenneth, 2001, The STRATAFORM Project: U.S. Geological Survey Geotechnical Studies: U.S. Geological Survey Open-File Report 01-190.

    Online Links:

    Other_Citation_Details:
    Minasian, Diane L., Lee, Homa J., Locat, Jaques, Orzech, Kevin M., Martz, Gregory R., Israel, Kenneth, 2001, The STRATAFORM Project: U.S. Geological Survey Geotechnical Studies: U.S. Geological Survey Open-File Report 01-190, https://pubs.usgs.gov/of/2001/0190/.

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

  1. How well have the observations been checked?
    Identified as best available version.
  2. How accurate are the geographic locations?
    Position data were provided by a Global Postitioning System (GPS) navigation receiver. A formal accuracy assessment of the horizontal positional information in the data set has not been conducted.
  3. How accurate are the heights or depths?
    Depths shown in the seismic data files are in milliseconds (round trip travel time) and are referenced to sea level.
  4. Where are the gaps in the data? What is missing?
    Dataset is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details.
  5. How consistent are the relationships among the observations, including topology?
    Subbottom data were collected during USGS cruise W-1-96-NC using a Huntec Hydrosonde Deep-Tow system. Quality control was conducted during the collection process.

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:
USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator of the dataset and in products derived from these data. This information is not intended for navigation purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    2885 Mission Street
    Santa Cruz, CA

    1-831-427-4747 (voice)
    pcmsc_data@usgs.gov
  2. What's the catalog number I need to order this data set? W196NC-boomer-sgy.zip This zip file contains boomer sub-bottom (SEG-Y) data collected during USGS field activity W-1-96-NC. These data are divided up and presented by navigation line, as reflected in the individual file names.
  3. What legal disclaimers am I supposed to read?
    Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty.
  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, such as ProMax and Seisworks by Landmark Geophysical; FOCUS and SeisX by Paradigm Geophysical; SPW by Parallel Geoscience; VISTA by Seismic Image Software; SeiSee by Dalmorneftegeophysica (DMNG); amongst others.

Who wrote the metadata?

Dates:
Last modified: 19-Oct-2020
Metadata author:
U.S. Geological Survey, Pacific Coastal and Marine Science Center
Attn: PCMSC Science Data Coordinator
2885 Mission Street
Santa Cruz, CA

831-427-4747 (voice)
pcmsc_data@usgs.gov
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)
This page is <https://cmgds.marine.usgs.gov/catalog/pcmsc/DataReleases/CMGDS_DR_tool/DR_P950276G/W196NC_boomer_metadata.faq.html>
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