Multi-sensor core logger (MSCL) data of vibracores and bob-cores collected in Lake Ozette, from 2019 to 2021

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Frequently anticipated questions:

What does this data set describe?

Title:
Multi-sensor core logger (MSCL) data of vibracores and bob-cores collected in Lake Ozette, from 2019 to 2021
Abstract:
This dataset includes multi-sensor core logger (MSCL) data from sediment cores collected in Lake Ozette, Washington. The sediment cores were collected during USGS field activities 2019-622-FA and 2021-641-FA for investigating submarine landslide deposits triggered by large Cascadia Subduction Zone earthquakes.
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 https://cmgds.marine.usgs.gov/fan_info.php?fan=2021-641-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?
    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, Multi-sensor core logger (MSCL) data of vibracores and bob-cores collected in Lake Ozette, from 2019 to 2021: 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 from 2019 to 2021: data release DOI:10.5066/P9W5RAL4, U.S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -124.66785
    East_Bounding_Coordinate: -124.607701
    North_Bounding_Coordinate: 48.15099
    South_Bounding_Coordinate: 48.051844
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Beginning_Date: 18-Oct-2019
    Ending_Date: 30-Aug-2021
    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 (13459)
    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 0.000001. Longitudes are given to the nearest 0.000001. Latitude and longitude values are specified in Decimal Degrees. 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.
      Vertical_Coordinate_System_Definition:
      Depth_System_Definition:
      Depth_Datum_Name: Local surface
      Depth_Resolution: 0.001
      Depth_Distance_Units: meters
      Depth_Encoding_Method: Attribute values
  7. How does the data set describe geographic features?
    OzetteLake.core.MSCL.csv
    Comma-delimited text file containing multi-sensor core logger data for core samples. (Source: Producer defined)
    Core Name
    Core number as assigned in the lab. VC denotes vibracore and BC for bobcore (aka percussion core) followed by core number (for example, VC-01 is vibracore 1 and BC-101 is bobcore 101). (Source: Producer defined) Unique identifier for the sample used given in the field. These are explicitly defined in the core information section csv file ‘OzetteLake.core.location.information.csv’ from this same data release.
    Section Number
    Depth in core that each measurement was taken. (Source: producer defined)
    Range of values
    Minimum:1
    Maximum:2
    Units:count of section numbers
    Section Depth (cm)
    Depth in core that each measurement was taken. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:154.5
    Units:cm (centimeters)
    CT (cm)
    Approximate thickness of core sediments. (Source: producer defined)
    Range of values
    Minimum:5.793
    Maximum:8.692
    Units:cm (centimeters)
    PWAmp (mv/V)
    P-wave amplitude of sediment in sample interval. In units of RMS value of mV transmitted through core per voltage applied. Values of "n.d." indicate no data. (Source: producer defined)
    Range of values
    Minimum:0
    Maximum:0.0119
    Units:mV/V (millivolts per volts applied)
    PWVel (m/s)
    P-wave velocity of sediment in sample interval. Values of "n.d." indicate no data. (Source: producer defined)
    Range of values
    Minimum:448.1962
    Maximum:4147.509
    Units:m/s (meters per second)
    Den1 (g/cc)
    Gamma density of sediment in sample interval. (Source: Producer defined)
    Range of values
    Minimum:-0.5121
    Maximum:2.473
    Units:g/cc (grams per cubic centimeter)
    MS1 (SI x 10^-5)
    Magnetic susceptibility of sediment in sample interval. Values of "n.d." indicate no data. (Source: Producer defined)
    Range of values
    Minimum:-4.6655
    Maximum:262.5239
    Units:SI units times 10^-5
    Imp (kg/sm^2 x 10^-5)
    Acoustic impedance of sediment in sample interval. Values of "n.d." indicate no data. (Source: Producer defined)
    Range of values
    Minimum:-1060.823
    Maximum:7018.649
    Units:kg/(s*m^2) x 10^3 (kilograms per second meter squared times 10^-5)
    FP
    Fractional porosity of sediments. Values of "n.d." indicate no data. (Source: Producer defined)
    Range of values
    Minimum:-0.7944
    Maximum:1.848
    Units:Fractional Porosity is a unitless ratio defined as (MGD-GD1)/(MGD-WD) where MGD is mineral grain density, GD1 is the Gamma Density as recorded by the MSCL, and WD is pore fluid density.
    Entity_and_Attribute_Overview:
    The first line of the csv file is a header line. Location information for each sediment core can be found in the OzetteLake.core.location.information.csv included in this data release.
    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)
    • 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 Lake Ozette, 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: 2021 (process 1 of 2)
    Vibracores (VC- labeled core IDs) were collected using a Rossfelder P-5 vibracorer during USGS field activity 2019-622-FA and bob cores (BC- or -BC labeled core IDs) were collected using a mini-hammer corer during USGS field activity 2021-641-FA. The cores were transported back to the USGS Pacific Coastal and Marine Science Center core lab for splitting and archiving and subsequent analyses.
    Date: 2021 (process 2 of 2)
    Multi-sensor core logger (MSCL) data were acquired on a Geotek MSCL-S system (https://www.geotek.co.uk/products/mscl-s/). Each core was scanned through the system which records core thickness, p-wave amplitude, p-wave velocity, density, magnetic susceptibility, and acoustic impedance. Users are advised to review the data carefully as measurement intervals and measurements taken vary among cores. No data values are noted by ‘n.d.’ values and often occur near the start and end of core sections.
  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, processing workflows, and in compilation of this data release.
  2. How accurate are the geographic locations?
  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. No MSCL data are available for vibracores VC-16 and VC-34.
  5. How consistent are the relationships among the observations, including topology?
    No formal logical consistency tests were conducted. MSCL data values are sometimes inaccurate where there is air within the core section (usually near the start and end of core sections) due to the multi-sensor core logger’s calibration to expect sediment. This may result in nonsensical data values such as negative densities and P-wave velocities.

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 - 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? Multi-sensor core logger data are provided in a csv format (OzetteLake.core.MSCL.csv) accompanied by CSDGM 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: Comma-delimited text file of multi-sensor core logger data. in format comma-delimited text Size: 0.7971
      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?
    MSCL data in comma-delimited text format can be viewed with any standard table editing software (for example, Excel, Numbers).

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/OzetteLake.core.MSCL.metadata.faq.html>
Generated by mp version 2.9.51 on Mon Jun 24 11:44:02 2024