Optically stimulated luminescence (OSL) age data from vibracores collected offshore central California, during field activity 2019-651-FA (ver 2.0, August 2023)

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Frequently anticipated questions:

What does this data set describe?

Title:
Optically stimulated luminescence (OSL) age data from vibracores collected offshore central California, during field activity 2019-651-FA (ver 2.0, August 2023)
Abstract:
This dataset includes optically stimulated luminescence (OSL) age data from sediment cores collected offshore central California in the vicinity of Morro Bay. These data were collected aboard the M/V Bold Horizon in October 2019 for use in regional hazard assessments relating to the Hosgri Fault.
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=2019-651-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., Kluesner, Jared W., Johnson, Samuel Y., Medri, Elisa, Simms, Alex, Nishenko, Stu, Greene, H. Gary, and Conrad, James E., 20230908, Optically stimulated luminescence (OSL) age data from vibracores collected offshore central California, during field activity 2019-651-FA (ver 2.0, August 2023): data release DOI:10.5066/P9A0U8J7, 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., Kluesner, Jared W., Johnson, Samuel Y., Medri, Elisa, Simms, Alex, Nishenko, Stu, Greene, H. Gary, and Conrad, James E., 2022, Geophysical and core sample data collected offshore central California, during field activity 2019-651-FA (ver 2.0, August 2023): data release DOI:10.5066/P9A0U8J7, 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: -121.080024
    East_Bounding_Coordinate: -121.043532
    North_Bounding_Coordinate: 35.477597
    South_Bounding_Coordinate: 35.419749
  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: 24-Oct-2019
    Currentness_Reference:
    Ground conditions at time data were collected
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: CSV format tabular data
  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 (10)
    2. What coordinate system is used to represent geographic features?
  7. How does the data set describe geographic features?
    2019-651-FA_cores_OSL.csv
    Comma-delimited text file containing optically stimulated luminescence (OSL) age data for core samples. (Source: Producer defined)
    Core Name
    Core identifier (Source: U.S. Geological Survey) Unique identifier for cores assigned by USGS in the field.
    Sample Depth in Core (cm)
    Sampling interval depths in centimeters as measured from top of core (Source: U.S. Geological Survey)
    Range of values
    Minimum:22
    Maximum:248
    Units:centimeters
    CAM age (ka)
    The luminescence age of the sample using the central age model equivalent dose (Source: Producer defined)
    Range of values
    Minimum:2.47
    Maximum:55.9
    Units:age in kilo annum
    CAM uncertainty (ka)
    Uncertainty of the central age model age at the 95% confidence interval (Source: Producer defined)
    Range of values
    Minimum:0.18
    Maximum:2.9
    Units:age uncertainty in kilo annum
    MAM age (ka)
    The luminescence age of the sample using the minimum age model equivalent dose (Source: Producer defined)
    Range of values
    Minimum:1.84
    Maximum:43.1
    Units:age in kilo annum
    MAM uncertainty (ka)
    Uncertainty of the minimum age model age at the 95% confidence interval (Source: Producer defined)
    Range of values
    Minimum:0.17
    Maximum:3
    Units:age uncertainty in kilo annum
    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 2019-651-FA_cores_locations shapefile 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
    • Jared W. Kluesner
    • Samuel Y. Johnson
    • Elisa Medri
    • Alex Simms
    • Stu Nishenko
    • H. Gary Greene
    • James E. Conrad
  2. Who also contributed to the data set?
    USGS PCMSC Marine Facility personnel Rachel Marcuson, Jenny McKee, Cordell Johnson, and Dan Powers led vibracore collection operations.
  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 Hazards and Resources Program. The Hosgri Fault is a submarine fault system that likely poses the greatest submarine earthquake threat in the central California region. To gain a better understanding of this fault system, the USGS collected sparker multichannel seismic, CHIRP seismic, and sediment cores to enable a detailed investigation of its geologic history and ongoing activity. These data are intended to further our understanding of geologic hazards near the Hosgri Fault, improve risk assessments for local communities and critical infrastructure, and to provide data for future research on regional tectonic, sedimentary, and geomorphic evolution of coastal California. This work was funded through a Cooperative Research and Development Agreement (CRADA) between the USGS and Pacific Gas and Electric Corporation.

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 4)
    Cores were collected aboard the M/V Bold Horizon using a Rossfelder P-5 vibracorer during U.S. Geological Survey cruise 2019-651-FA. The cores were transported back to the USGS Pacific Coastal and Marine Science Center core lab for subsequent analyses. Cores designated for OSL dating were kept shielded from light exposure in black liners and were not placed in any radiation-based scanners or imaging equipment.
    Date: 05-Apr-2022 (process 2 of 4)
    Where suitable materials were present in sediment layers of interest, sediment samples were obtained and sent to the USGS Luminescence Dating Laboratory to obtain OSL ages. A full detailing of lab procedures is beyond the scope of this metadata release, however, laboratory methods may be found at the USGS Luminescence Dating Lab webpage: https://www.usgs.gov/labs/luminescence-dating-laboratory or by reviewing the methods described in Gray and others (2015) and Nelson and others (2015) listed in the Cross_References section. Person who carried out this activity:
    Harrison J. Gray
    U.S. Geological Survey Luminescence Dating Laboratory
    Research Geologist
    P.O. Box 25046, MS 980
    Denver, CO

    303-236-7928 (voice)
    hgray@usgs.gov
    Date: 04-Jan-2023 (process 3 of 4)
    Corrected author/Originator spelling in Citation and Larger Work Citation sections of metadata (Media to Medri). No data were changed. (scochran@usgs.gov)
    Date: 21-Aug-2023 (process 4 of 4)
    Added most up to date OSL data as of August 2023 for cores 1, 4, 6, 7, and 12 (grsnyder@usgs.gov).
  3. What similar or related data should the user be aware of?
    Gray, Harrison J., Mahan, Shannon A., Rittenour, Tammy, and Nelson, Michelle S., 2015, Guide to luminescence dating techniques and their application for paleoseismic research.

    Online Links:

    Other_Citation_Details:
    Gray H.J., Mahan, S.A., Rittenour, T., and Nelson, M.S., 2015, Guide to luminescence dating techniques and their application for paleoseismic research: Proceedings Volume, Basin and Range Province Seismic Hazards Summit III, Utah Geological Survey Miscellaneous Publication, 15-5.
    Nelson, Michelle S., Gray, Harrison J., Johnson, Jack A., Rittenour, Tammy, Feathers, James K., and Mahan, Shannon A., 2015, User guide for luminescence sampling in archaeological and geological contexts.

    Online Links:

    Other_Citation_Details:
    Nelson, M.S., Gray, H.J., Johnson, J.A., Rittenour, T., Feathers, J.K., and Mahan, S.A., 2015, User guide for luminescence sampling in archaeological and geological contexts: Advances in Archaeological Practice, vol. 3, p. 166-177.

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?
  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?
    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
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? Optically stimulated luminescence (OSL) age data are provided in a comma-delimited text file (2019-651-FA_cores_OSL.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 optically stimulated luminescence (OSL) age data. in format comma-delimited text Size: 0.00042
      Network links: https://doi.org/10.5066/P9A0U8J7
    • Cost to order the data: None.

  5. What hardware or software do I need in order to use the data set?
    Optically stimulated luminescence (OSL) age data in .csv format can be viewed with any standard table editing software (for example, Excel, Numbers).

Who wrote the metadata?

Dates:
Last modified: 08-Sep-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_P9A0U8J7/2019-651-FA_cores_OSL_metadata.faq.html>
Generated by mp version 2.9.51 on Fri Sep 15 14:20:46 2023