Locations of sediment cores collected from Montague Island, AK

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Frequently anticipated questions:

What does this data set describe?

Title: Locations of sediment cores collected from Montague Island, AK
Abstract:
This dataset includes locations of sediment cores collected from coastal environments on Montague Island, Alaska. The cores were collected with hand driven peat augers to assess environmental changes related to tectonic uplift caused by historic and prehistoric earthquakes.
Supplemental_Information:
Cores were collected by USGS, Alaska Science Center; cores were subsequently analyzed and archived by collaborating scientists at Virginia Tech. 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?
    Witter, Robert C., SeanPaul M. La Selle, DePaolis, Jessica, Haeussler, Peter J., Bender, Adrian M., Curran, Janet H., and Dura, Tina, 20240326, Locations of sediment cores collected from Montague Island, AK: data release DOI:10.5066/P13RVDJZ, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Witter, Robert C., SeanPaul M. La Selle, DePaolis, Jessica, Haeussler, Peter J., Bender, Adrian M., Curran, Janet H., and Dura, Tina, 2024, Computed Tomography (CT) scans of sediment cores collected from Montague Island, AK: data release DOI:10.5066/P13RVDJZ, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Other_Citation_Details:
    Suggested Citation: Witter, R.C., La Selle, S.M., DePaolis, J., Haeussler, P.J., Bender, A.M., Curran, J.H., Dura, T., 2024, Computed Tomography (CT) scans of sediment cores collected from Montague Island, AK: U.S. Geological Survey data release, https://doi.org/10.5066/P13RVDJZ.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -147.32948
    East_Bounding_Coordinate: -147.30783
    North_Bounding_Coordinate: 60.17820
    South_Bounding_Coordinate: 60.19528
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 10-Jul-2019
    Ending_Date: 30-Aug-2019
    Currentness_Reference:
    Ground conditions at time data were collected
  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 (6)
    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 0.00001. Longitudes are given to the nearest 0.00001. 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.
      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 1.0
      Depth_Distance_Units: centimeters
      Depth_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    montague_cores.csv
    A comma delimited text file in CSV format containing core location information and computed tomography (CT) scan image file names included in this data release. (Source: Producer defined)
    core_id
    Unique core identification assigned in the field. (Source: Producer defined) Core IDs begin with '19' indicating collection in 2019. 'HL' refers to the Hidden Lagoons field site. 'CR' refers to the Crescent field site. Core segments from core site 19CR-10 were imaged in two separate CT scans and are designated with core IDs ‘19CR-10-01’ and ‘10CR-10-02’.
    scan_filename
    The filename of the CT scan TIF image associated with each core. (Source: Producer defined) CT images are included in this data release in the 'montague_ct.zip' file. Core segments from core 19CR-10 were imaged in two separate CT scans.
    core_segment_depths_cm
    The depth intervals each core segment represents, in centimeters below the ground surface at the time of core collection. (Source: Producer defined) CT scans contain 2-3 segments, and the depth intervals, starting with the uppermost core in the CT scan image are listed and separated by semicolons. The supporting file 'montague_ct_supportfile.pdf' included in the CT scan portion of this data release illustrates the locations of each core segment and their respective depth intervals.
    latitude
    Latitude of core site, in decimal degrees. (Source: handheld GPS)
    Range of values
    Minimum:60.17820
    Maximum:60.19528
    Units:decimal degrees
    longitude
    Unique core identification assigned in the field. Core IDs begin with '19' indicating collection in 2019. 'HL' refers to the Hidden Lagoons field site. 'CR' refers to the Crescent field site. (Source: handheld GPS)
    Range of values
    Minimum:-147.32948
    Maximum:-147.30783
    Units:decimal degrees
    Entity_and_Attribute_Overview: The first line of the csv file is a header line.
    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)
    • Robert C. Witter
    • SeanPaul M. La Selle
    • Jessica DePaolis
    • Peter J. Haeussler
    • Adrian M. Bender
    • Janet H. Curran
    • Tina Dura
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
    PCMSC Science Data Coordinator
    U.S. Geological Survey, Pacific Coastal and Marine Science Center
    2885 Mission Street
    Santa Cruz, CA

    831-427-474 (voice)
    pcmsc_data@usgs.gov

Why was the data set created?

The 2017 USGS Subduction Zone Science plan includes the key priority to characterize past hazardous events to forecast the future using onshore and offshore clues. Such clues include coastal evidence of sudden vertical land-level changes caused by large earthquakes along subduction zones. Sediment cores from lagoons uplifted >3 m in the 1964 earthquake along the coast of Montague Island aid in interpreting changes in deposition environment over the past several thousand years, which may record evidence for past episodes of earthquake uplift.

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: 2019 (process 1 of 1)
    Sediment cores were collected from coastal environments on Montague Island, Alaska using a hand-driven peat sampler at two sites: 'Hidden Lagoons' and 'Crescent'. At each core site, two adjacent bore holes were used to sample sediment in 50 cm intervals. Coring alternated between the two bore holes to avoid sampling the approximately 7 cm of disturbed sediment induced by the “nose” at the bottom of the peat sampler. After core extraction, sediment in the auger was transferred to an approximately 5 cm diameter plastic sleeve (50 cm long, 2 inch diameter polyvinyl chloride (PVC) pipe cut lengthwise) and wrapped in plastic. Sampling depths were targeted to bracket specific stratigraphic layers. The cores in this data release therefore do not represent the entire stratigraphic sequence at each core site. Cores were transported back to the USGS Pacific Coastal and Marine Science Center core lab for subsequent CT analyses.
  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?
    Quality control of attribute accuracy was conducted during field data collection and processing workflows. No formal attribute accuracy tests were conducted.
  2. How accurate are the geographic locations?
    The locations of core sites in 2019 were determined using a handheld global satellite navigation system (GNSS) receiver capable of receiving wide area augmentation system (WAAS) signals. The manufacturer reported accuracy for horizontal positions is 3-5 m while receiving WAAS signals.
  3. How accurate are the heights or depths?
    Core depth interval values are relative to the top of sediment surface at the time of core collection. Coring-induced compaction, if any, was not determined. No formal vertical 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 consistency 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 None. Please see 'Distribution Info' for details.
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 - CMGDS
    2885 Mission Street
    Santa Cruz, CA
    United States

    831-427-4747 (voice)
    pcmsc_data@usgs.gov
  2. What's the catalog number I need to order this data set? Core information are provided in a CSV file (montague_cores.csv) with CSDGM FGDC compliant metadata. The first line of this file is a header.
  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: A Comma Separated Value (CSV) file containing the core ids, associated CT image filenames, core segment depth intervals, and locations of cores collected from Montague Island, AK. in format Comma delimited text (version Microsoft Excel v2308 running on Microsoft Windows 10 Enterprise v10.0.19045.) Size: 0.000492
      Network links: https://doi.org/10.5066/P13RVDJZ
    • Cost to order the data: None.

  5. What hardware or software do I need in order to use the data set?
    CSV file can be viewed with any standard text editing software.

Who wrote the metadata?

Dates:
Last modified: 29-Mar-2024
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_P13RVDJZ/montague_cores_metadata.faq.html>
Generated by mp version 2.9.51 on Fri Mar 29 12:17:37 2024