Chirp sub-bottom data collected during USGS field activity 2018-658-FA between Cape Blanco and Cape Mendocino in October of 2018

Metadata also available as - [Outline] - [Parseable text] - [XML]

Frequently anticipated questions:

What does this data set describe?

Title:
Chirp sub-bottom data collected during USGS field activity 2018-658-FA between Cape Blanco and Cape Mendocino in October of 2018
Abstract:
This data release contains processed chirp sub-bottom data that were collected aboard Humboldt State University’s R/V Coral Sea in October of 2018 on U.S. Geological Survey cruise 2018-658-FA on the shelf and slope between Cape Blanco, Oregon, and Cape Mendocino, California. MCS data were collected to characterize quaternary deformation and sediment dynamics along the southern Cascadia margin. Chirp sub-bottom data were collected coincident with sparker MCS data.
Supplemental_Information:
Additional information about the field activities from which these data were derived is available online at:
https://cmgds.marine.usgs.gov/fan_info.php?fan=2018-658-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., Kluesner, Jared W., Watt, Janet T., Hill, Jenna C., Brothers, Daniel S., Michalak, Melanie J., and O’Shea, Daniel, 20230809, Chirp sub-bottom data collected during USGS field activity 2018-658-FA between Cape Blanco and Cape Mendocino in October of 2018: data release DOI:10.5066/P9MYL7WJ, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, California.

    Online Links:

    This is part of the following larger work.

    Balster-Gee, Alicia F., Kluesner, Jared W., Watt, Janet T., Hill, Jenna C., Brothers, Daniel S., Michalak, Melanie J., and O'Shea, Daniel, 2023, Multichannel sparker and chirp seismic reflection data collected during USGS field activity 2018-658-FA between Cape Blanco and Cape Mendocino in October of 2018: data release DOI:10.5066/P9MYL7WJ, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Other_Citation_Details:
    Suggested Citation: Balster-Gee, A.F., Kluesner, J.W., Watt, J.T., Hill, J.C., Brothers, D.S., Michalak, M.J., and O’Shea, D., 2023, Multichannel sparker and chirp seismic reflection data collected during USGS field activity 2018-658-FA between Cape Blanco and Cape Mendocino in October of 2018: U.S. Geological Survey data release, https://doi.org/10.5066/P9MYL7WJ.
  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -125.38574219
    East_Bounding_Coordinate: -123.48388672
    North_Bounding_Coordinate: 43.25108812
    South_Bounding_Coordinate: 40.14849082
  3. What does it look like?
    2018-658-FA.chirp.preview.png (PNG)
    Map of 2018-658-FA chirp seismic tracklines.
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 04-Oct-2018
    Ending_Date: 18-Oct-2018
    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 stored in the SEG-Y data trace headers in header bytes 81 and 85.
    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
    • Jared W. Kluesner
    • Janet T. Watt
    • Jenna C. Hill
    • Daniel S. Brothers
    • Melanie J. Michalak
    • Daniel O’Shea
  2. Who also contributed to the data set?
    This data collection was a joint effort between the U.S. Geological Survey and Humboldt State University. The authors acknowledge the crew of Humboldt State University’s R/V Coral Sea and all those involved in in survey planning and execution.
  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 USGS collected chirp sub-bottom data and high-resolution sparker MCS profiles in October of 2018 along the southern Cascadia margin and marine forearc between Cape Blanco, Oregon, and Cape Mendocino, California. Primary goals of this survey were to image the offshore portion of the Quaternary active Little Salmon and Mad River fault zones. Other goals were to image the stratigraphy of Trinidad, Sixes, and Rogue canyons. MCS data were collected using a Delta Sparker source and recorded on an 88-channel digital streamer. Chirp sub-bottom data were collected using an Edgetech 512 chirp towfish. These data and information are intended for science researchers, students, 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: 05-Mar-2020 (process 1 of 1)
    The Discover acquisition software (v. 6) output envelope chirp data in SEG-Y format. Sioseis seismic software (https://sioseis.ucsd.edu/) was used to correct for the chirp towfish depth. Data were then swell corrected over a period of 35 traces and the water column was muted 200ms above the seafloor. Processed data were exported to SEG-Y format with standard header byte locations. X and Y navigation points are written to header bytes 81/85 in UTM zone 10N coordinates. SEG-Y data files were compressed into the zip file 2018-658-FA.chirp.segy.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?
    Identified as best available version
  2. How accurate are the geographic locations?
    Position data were provided by a Differential Global Postitioning System (DGPS) 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?
  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?
    Multichannel sparker seismic reflection data were collected during USGS field activity 2018-658-FA using an 88-channel Geometrics GeoEel digital hydrophone streamer (1.5625 m and 3.25 m group spacings), a 6.4 kJ Applied Acoustics power supply, and a Delta Sparker sound source. Quality control was conducted during the collection process. Chirp data was collected coincident with sparker MCS data so there is intermittent overprinting of the sparker source on the chirp data. This overprinting causes swell correction artifacts in some locations. Other swell correction artifacts exist at line starts and ends and in locations where the seafloor amplitudes are low.

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 - CMGDS
    2885 Mission Street
    Santa Cruz, CA

    831-427-4747 (voice)
    pcmsc_data@usgs.gov
  2. What's the catalog number I need to order this data set? 2018-658-FA.chirp.zip This zip file contains chirp sub-bottom (SEG-Y) data collected during USGS field activity 2018-658-FA. 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?
    • Availability in digital form:
      Data format: Zip file contains the processed seismic data per navigation line in format SEG-Y (version SEG-Y rev 1) Size: 13200
      Network links: https://doi.org/10.5066/P9MYL7WJ
    • Cost to order the data: None.

  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 Reveal by Shearwater Geophysical; 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: 09-Aug-2023
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_P9MYL7WJ/2018-658-FA.chirp.metadata.faq.html>
Generated by mp version 2.9.51 on Fri Aug 18 09:04:50 2023