Chirp sub-bottom data collected in Ozette Lake, Washington, in 2019

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Frequently anticipated questions:

What does this data set describe?

Title:
Chirp sub-bottom data collected in Ozette Lake, Washington, in 2019
Abstract:
Chirp seismic reflection data and associated navigation files were collected in Ozette Lake, Washington, in 2019 for use in regional earthquake hazard assessments relating the Cascadia Subduction Zone. Dataset includes both raw and processed chirp data.
Supplemental_Information:
Additional information about the field activity from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2019-622-FA
Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology.
  1. How might this data set be cited?
    Snyder, George R., Balster-Gee, Alicia F., Brothers, Daniel S., Singleton, Drake M., Padgett, Jason S., Hill, Jenna C., Ritchie, Andrew C., SeanPaul M. La Selle, Kluesner, Jared W., Sherrod, Brian, Powers, Daniel C., Ferro, Peter Dal, and Currie, Jackson E., 20240615, Chirp sub-bottom data collected in Ozette Lake, Washington, in 2019: data release DOI:10.5066/P9W5RAL4, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Snyder, George R., Balster-Gee, Alicia F., Brothers, Daniel S., Singleton, Drake M., Padgett, Jason S., Hill, Jenna C., Ritchie, Andrew C., SeanPaul M. La Selle, Kluesner, Jared W., Sherrod, Brian, Powers, Daniel C., Ferro, Peter Dal, and Currie, Jackson E., 2024, Seismic sub-bottom, sediment core, and radiocarbon data collected in Ozette Lake, Washington: data release DOI:10.5066/P9W5RAL4, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

    Other_Citation_Details:
    Suggested Citation: Snyder, G.R., Balster-Gee, A.F., Brothers, D.S., Singleton, D.M., Padgett, J.S., Hill, J.C., Ritchie, A.C., La Selle, S.M., Kluesner, J.W., Sherrod, B., Powers, D.C., Dal Ferro, P., and Currie, J.E., 2024, Seismic sub-bottom, sediment core, and radiocarbon data collected in Ozette Lake, Washington: U.S. Geological Survey data release, https://doi.org/10.5066/P9W5RAL4.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -124.607344
    East_Bounding_Coordinate: -124.668633
    North_Bounding_Coordinate: 48.152533
    South_Bounding_Coordinate: 48.039542
  3. What does it look like?
    2019-622-FA_seismic_chirp.jpg (JPG)
    Example image of 2019-622-FA chirp seismic data.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 14-Jul-2019
    Ending_Date: 03-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:
    Chirp seismic reflection data in SEG-Y format and navigation polylines in Shapefile format.
  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 (14)
    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 WGS 1984.
      The ellipsoid used is WGS 84.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257224.
  7. How does the data set describe geographic features?
    Entity_and_Attribute_Overview:
    Zip archive of seismic shots with time stamp in standard SEG-Y 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)
    • George R. Snyder
    • Alicia F. Balster-Gee
    • Daniel S. Brothers
    • Drake M. Singleton
    • Jason S. Padgett
    • Jenna C. Hill
    • Andrew C. Ritchie
    • SeanPaul M. La Selle
    • Jared W. Kluesner
    • Brian Sherrod
    • Daniel C. Powers
    • Peter Dal Ferro
    • Jackson E. Currie
  2. Who also contributed to the data set?
  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?

Identification of fault-related submarine hazards is a primary mission of the USGS Coastal and Marine Geology Program. In the US Pacific Northwest region, the greatest earthquake and tsunami threat is posed by the Cascadia Subduction Zone. From 2019-2021 the USGS carried out a detailed field investigation of earthquake-triggered landslide deposits in Ozette Lake, WA, to reconstruct the timing and severity of large subduction zone earthquakes in northern Cascadia. Field data collected as part of this investigation include boomer single-channel seismic, chirp seismic, and sediment cores. These data are intended to further our understanding of geologic hazards relating to the Cascadia Subduction Zone, improve risk assessments for local communities and critical infrastructure, and to provide data for future research on regional tectonic and sedimentary history of northern Cascadia.

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: 24-Oct-2019 (process 1 of 2)
    Field seismic data collection: Seismic data was collected during USGS field activity 2019-622-FA using an EdgeTech SB-512 CHIRP sub-bottom profiler and Discover seismic acquisition software. Field data were collected in JSF and SEG-Y formats. Navigation data was collected simultaneously with a Hemisphere V110 GPS and saved into the seismic headers during acquisition.
    Date: 26-Aug-2023 (process 2 of 2)
    The following processing flow was carried out in Shearwater Reveal (v. 5.1) to process field data output to SEG-Y files: (1) Field-collected SEG-Y files were imported to Shearwater Reveal and navigation was converted to WGS 1984 UTM Zone 10 North. These coordinates are populated in the seismic trace headers in bytes 73 and 77. SEG-Y files were added to the data zip file (2019-622-FA.seismic.chirp.zip).
  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.
  2. How accurate are the geographic locations?
    A Hemisphere V110 GPS system was used for obtaining navigation data during the cruise with a stated accuracy of 0.6 meters (95 percent confidence).
  3. How accurate are the heights or depths?
  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. Data release will be updated as additional data is processed.
  5. How consistent are the relationships among the observations, including topology?
    All SEG-Y and navigation data were derived from the same instruments and processing workflows.

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. This information is not intended for navigation purposes.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey - CMGDS
    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? Seismic data are available in SEG-Y format (2019-622-FA_seismic_chirp.zip). SEG-Y files contain UTM zone 10N navigation in header bytes 73 and 77.
  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: Zip file contains processed seismic data per single navigation line in format SEG-Y (version SEG-Y rev 1) Size: 2400
      Network links: https://doi.org/10.5066/P9W5RAL4
    • Cost to order the data: None.

  5. What hardware or software do I need in order to use the data set?
    Viewing SEG-Y data requires specialized software. A list of common SEG-Y processing and visualization software is available here: (http://www.oilfieldwiki.com/wiki/List_of_free_geophysics_software).

Who wrote the metadata?

Dates:
Last modified: 15-Jun-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_P9W5RAL4/2019-622-FA_seismic_chirp_metadata.faq.html>
Generated by mp version 2.9.51 on Mon Jun 24 11:44:02 2024