Photographs of gravity core sections and push cores from the Escanaba Trough vent field, Gorda Ridge

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Frequently anticipated questions:

What does this data set describe?

Title:
Photographs of gravity core sections and push cores from the Escanaba Trough vent field, Gorda Ridge
Abstract:
This portion of the data release presents linescan images (photographs) from push cores and gravity core sections collected from the Escanaba Trough vent field, Gorda Ridge, in the northeast Pacific Ocean. These data were collected in 2022 (USGS Field Activity 2022-621-FA). Images were obtained from 18 gravity core sections and 39 push cores at 50-micron (200 pixel per cm) resolution. Color images in 16-bit TIFF format are provided for each core segment, along with proprietary metadata files containing image scaling information. Push core images contain an additional TIFF image with a centimeter scale ruler (denoted with _R in filename).
Supplemental_Information:
Additional information about the field activity or activities from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2022-621-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?
    Adamczyk, Katlin Bowman, Gartman, Amy, Favela, Jaycee, and Tidwell, Jacob, 20250317, Photographs of gravity core sections and push cores from the Escanaba Trough vent field, Gorda Ridge: data release DOI:10.5066/P13B46QX, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Adamczyk, Katlin Bowman, Gartman, Amy, Favela, Jaycee, and Tidwell, Jacob, 2025, Computed tomography (CT) scans, photographs, geochemistry, grain-size and total carbon analysis, X-ray fluorescence (XRF) scans, X-ray diffraction (XRD), magnetic susceptibility, and gamma-ray bulk density data of gravity cores and push cores from the Escanaba Trough (Gorda Ridge): data release DOI:10.5066/P13B46QX, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Other_Citation_Details:
    Suggested Citation: Adamczyk, K., Gartman, A., Favela, J., and Tidwell, J., 2025 Computed tomography (CT) scans, photographs, geochemistry, grain-size and total carbon analysis, X-ray fluorescence (XRF) scans, X-ray diffraction (XRD), magnetic susceptibility, and gamma-ray bulk density data of gravity cores and push cores from the Escanaba Trough (Gorda Ridge): U.S. Geological Survey data release, https://doi.org/10.5066/P13B46QX
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -127.5362
    East_Bounding_Coordinate: -127.4076
    North_Bounding_Coordinate: 41.1632
    South_Bounding_Coordinate: 40.6957
  3. What does it look like?
    https://www.sciencebase.gov/catalog/file/get/67004643d34e80be174aeaab?name= J2-1426-PC13_linescan.jpg&allowOpen=true (JPEG)
    Linescan photograph of a push core.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 01-Aug-2022
    Ending_Date: 08-Aug-2022
    Currentness_Reference:
    Time data were compiled to completion of the last process step
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: comma-delimited text
  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):
      • Point (57)
    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 .0001. Longitudes are given to the nearest .0001. Latitude and longitude values are specified in Decimal Degrees. The horizontal datum used is 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.
  7. How does the data set describe geographic features?
    zip files containing linescan images
    Each zip file contains 1 TIFF file and their respective software-proprietary XML files. Zip files for push cores contain an additional TIFF image with a centimeter scale ruler. The name of each zip file corresponds to the core id. TN403_CoreLocations contains the latitude, longitude, and water depth for each core id. (Source: producer defined)
    GC01-X_linescan, GC01-Y_linescan, GC01-Z_linescan, GC03-X_linescan, GC03-Y_linescan, GC03-Z_linescan, GC04-X_linescan, GC04-Y_linescan, GC04-Z_linescan, GC05-Z_linescan, GC06-X_linescan, GC06-Y_linescan, GC06-Z_linescan, GC08-X_linescan, GC08-Y_linescan, GC08-Z_linescan, GC09-Y_linescan, GC09-Z_linescan, J2-1418-PC03_linescan, J2-1418-PC04_linescan, J2-1418-PC06_linescan, J2-1418-PC08_linescan, J2-1418-PC12_linescan, J2-1418-PC15_linescan, J2-1419-PC01_linescanp, J2-1419-PC02_linescan, J2-1419-PC05_linescan, J2-1419-PC08_linescan, J2-1419-PC11_linescan, J2-1419-PC14_linescan, 2-1420-PC01_linescan, J2-1420-PC02_linescan, J2-1420-PC05_linescan, J2-1420-PC08_linescan, J2-1420-PC11_linescan, J2-1420-PC14_linescan, J2-1421-PC01_linescan, J2-1421-PC02_linescan, J2-1421-PC05_linescan, J2-1422-PC01_linescan, J2-1422-PC04_linescan, J2-1422-PC07_linescan, J2-1422-PC10_linescan, J2-1422-PC13_linescan, J2-1424-PC01_linscan, J2-1424-PC04_linescan, J2-1424-PC07_linescan, J2-1424-PC10_linescan, J2-1424-PC13_linescan, J2-1425-PC01_linescan, J2-1426-PC01_linescan, J2-1426-PC04_linescan, J2-1426-PC07_linescan, J2-1426-PC10_linescan, J2-1426-PC13_linescan.
    Folders each containing one or two linescan TIFF image representing each core section and their respective Geotek software-proprietary XML files. The TIFF files ending in “_R” include a digital scale on the left side of the image. The Geotek software-proprietary XML files contain the following attributes and example attribute values are provided: <geotek-image><image-type>giTIFImage</image-type> <coreID>J2-GC01-X</coreID> <section-number>1</section-number> <image-number>1</image-number> <physical-width>9.30</physical-width> <physical-height>68.40</physical-height> <physical-top>150.00</physical-top> <pixels-per-scan>5</pixels-per-scan> <pixels-per-CM>200</pixels-per-CM> <horizontal-resolution>200</horizontal-resolution> <exposure-time-ms>40</exposure-time-ms> <calibration-aperture>3.02</calibration-aperture> <image-aperture>3.43</image-aperture> <red-high-calibration>18.0</red-high-calibration> <green-high-calibration>18.0</green-high-calibration> <blue-high-calibration>18.0</blue-high-calibration> <red-low-calibration>0.0</red-low-calibration> <green-low-calibration>0.0</green-low-calibration> <blue-low-calibration>0.0</blue-low-calibration> <pixel-width>1860</pixel-width> <scan-lines>13680</scan-lines> <filename>IM001_01.tif</filename> <geotek-camera-lighting version="2" mode="visible"> <visible-lighting-data> <bank-two> <bank2cluster1>111</bank2cluster1> <bank2cluster2>111</bank2cluster2> <bank2cluster3>111</bank2cluster3> <bank2cluster4>111</bank2cluster4> <bank2cluster5>111</bank2cluster5> </bank-two> <bank-one> <bank1cluster1>111</bank1cluster1> <bank1cluster2>111</bank1cluster2> <bank1cluster3>111</bank1cluster3> <bank1cluster4>111</bank1cluster4> <bank1cluster5>111</bank1cluster5> </bank-one></visible-lighting-data> </geotek-camera-lighting> <convg-x-red>0</convg-x-red> <convg-x-green>0</convg-x-green> <convg-x-blue>0</convg-x-blue> <convg-y-red>0</convg-y-red> <convg-y-green>4</convg-y-green> <convg-y-blue>8</convg-y-blue> <is-a-sync-scan-image>0</is-a-sync-scan-image> </geotek-image> (Source: producer defined) These Geotek software-proprietary XML files contain information on linescan image acquisition settings and image scaling. The values in the example provided may be different for each scan. Please contact the PCMSC data coordinator for more information on the contents of these XML files.
    Entity_and_Attribute_Overview:
    Zip files contain TIFF image files and Geotek software-propietary metadata files
    Entity_and_Attribute_Detail_Citation: U.S. Geological Survey

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Katlin Bowman Adamczyk
    • Amy Gartman
    • Jaycee Favela
    • Jacob Tidwell
  2. Who also contributed to the data set?
    Exploring the Seafloor and Oceanic Footprints is an interagency effort involving the National Oceanic and Atmospheric Administration, the U.S. Geological Survey, and the Bureau of Ocean Energy Management. Funding is acknowledged from NOAA Ocean Exploration via its Ocean Exploration Fiscal Year 2019 Funding Opportunity and through the National Oceanographic Partnership Program (NOPP), from the USGS Coastal and Marine Hazards and Resources Enhanced Funding Opportunities, and from the Bureau of Ocean Energy Management through Interagency Agreement M19PG00021 with the United States Geological Survey.
  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?

Images were obtained to characterize sediment in gravity cores and push cores. These data are intended for science researchers, students, policy makers, and the general public.

How was the data set created?

  1. From what previous works were the data drawn?
    TN403_CoreLocations (source 1 of 1)
    Adamczyk, Katlin, Gartman, Amy, Favela, Jaycee, and Tidwell, Jacob, 2025, Location and water depth for gravity cores and push cores from the Escanaba Trough (Gorda Ridge): U.S. Geological Survey, online.

    Online Links:

    Type_of_Source_Media: U.S. Geological Survey data release
    Source_Contribution:
    Latitude, longitude, and water depth information for gravity cores and push cores from this same data release
  2. How were the data generated, processed, and modified?
    Date: 13-Jun-2022 (process 1 of 2)
    Push core and gravity core samples were collected on the R/V Thomas G. Thompson between May 24, 2022, and June 13, 2022, during the TN403 Escanaba Trough expedition, which was led and staffed by USGS employees. Push cores were pushed into sediment at 37 locations by ROV Jason’s manipulator arm in water depths between 3201 and 3301 meters. Gravity cores were collected using a gravity corer at 7 locations in water depths between 3209 and 3304 meters. Gravity cores greater than 60 cm in length were cut into sections onboard the ship and labeled ‘X’ (0-60 cm), ‘Y’ (60-120 cm), and ‘Z’ (>120 cm). All cores were stored upright and refrigerated until return to shore.
    Date: 08-Aug-2022 (process 2 of 2)
    Cores were split into "working" and "archive" halves in the lab. Sediment surfaces were cleaned and smoothed on the "archive" halves of split cores. Cores were loaded onto the track of a Geotek Multi Sensor Core Logger (MSCL) equipped with a Geotek Geoscan-III linescan camera and Geotek Imaging 3.7 software. Prior to imaging, the camera was calibrated to a white tile and an 18% grey calibration card. Person who carried out this activity:
    Katlin Adamczyk
    USGS
    Physical Scientist
    2885 Mission Street
    Santa Cruz, CA

    831-460-7420 (voice)
    kadamczyk@usgs.gov
  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?
    Prior to imaging, the camera was calibrated to a white tile and an 18 percent grey calibration card. Digital scale core depths are not corrected for sediment compaction and are relative to the surface of the sediment. No formal attribute accuracy tests were conducted.
  2. How accurate are the geographic locations?
    The locations of push core samples were determined using ROV Jason’s ultra-short baseline (USBL) navigation. Accuracy for this depth is approximately 6-26 m. The locations of gravity core samples were determined using the R/V Thomas G. Thompson’s GPS navigation, which is accurate to less than 5 m. A formal accuracy assessment of the horizontal positional information in the dataset has not been conducted.
  3. How accurate are the heights or depths?
    For push core samples, the vertical accuracy was determined with ROV Jason’s altimeter, which is accurate to less than 1 m. For gravity core samples, the vertical accuracy was determined with the R/V Thomas G. Thompson’s multibeam bathymetry system. No formal positional accuracy tests were conducted.
  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?
    No formal logical accuracy tests were conducted.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?
Access_Constraints No access constraints
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(s) of the dataset and in products derived from these data.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - ScienceBase
    Denver Federal Center, Building 810, Mail Stop 302
    Denver, CO

    1-888-275-8747 (voice)
    sciencebase@usgs.gov
  2. What's the catalog number I need to order this data set? Linescan images are available in TIFF image format and provided along with FGDC-compliant metadata.
  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?
    • Availability in digital form:
      Data format: Downloadable zip files, ranging in size from 20 MB to 310 MB, contain linescan TIFF (.tif) images and associated software-proprietary metadata files (.xml). Zip file names correspond to the core id. For example ‘J2-1421-PC01_linescan.zip’ contains linescan TIFF images from push core J2-1421-PC01. TN403_CoreLocations contains the latitude, longitude, and water depth for each core id. in format TIFF Size: 8387
      Network links: https://www.sciencebase.gov/catalog/item/67004643d34e80be174aeaab
      https://doi.org/10.5066/P13B46QX
    • Cost to order the data: None.

Who wrote the metadata?

Dates:
Last modified: 17-Mar-2025
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/ScienceBase/DR_P13B46QX/TN403_LineScan_Metadata.faq.html>
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