Radiocarbon 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:
Radiocarbon age data from vibracores collected offshore central California, during field activity 2019-651-FA (ver 2.0, August 2023)
Abstract:
This dataset includes radiocarbon 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, Radiocarbon 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 (40)
    2. What coordinate system is used to represent geographic features?
  7. How does the data set describe geographic features?
    2019-651-FA_cores_C14.csv
    Comma-delimited text file containing radiocarbon age data for core samples. (Source: Producer defined)
    UCIAMS Number
    University of California Irvine Accelerator Mass Spectrometry Laboratory Number (Source: UC Irvine) Unique identifier for the sample assigned at UCIAMS
    Sample name
    U.S. Geological Survey assigned sample name given in HF-“core”-“depth”-“material” (for example, HF-1-46-shell is Hosgri Fault core 1 sampled at 46 cm deep with shell material). (Source: U.S. Geological Survey) Unique identifier for the sample assigned at USGS
    Sampling Depth in Core (cm)
    Depth of sampling in centimeters as measured from top of core. “VC cutter nose” indicates sediments collected from vibracore cutter nose in the very bottom several centimeters of vibracore during collection. (Source: U.S. Geological Survey)
    Range of values
    Minimum:16
    Maximum:296
    Units:centimeters
    fraction modern
    fraction of modern carbon in sample (Source: Producer defined)
    Range of values
    Minimum:-0.0003
    Maximum:1.0082
    Units:unitless ratio
    fraction modern error
    Standard error of measurement in one standard deviation (Source: Produce defined)
    Range of values
    Minimum:-0.0006
    Maximum:0.0016
    Units:unitless ratio
    D14C (per mille)
    carbon 14 depletion per mille (Source: Produce defined)
    Range of values
    Minimum:-1000.3
    Maximum:8.2
    Units:per mille
    D14C error (per mille)
    One standard deviation error of D14C measurement in per mille (Source: Produce defined)
    Range of values
    Minimum:-0.6
    Maximum:1.6
    Units:per mille
    14C age (years BP)
    Carbon 14 age in years before present. “Modern” value indicates sample was modern in age. Values of “>54000” indicate samples that are older than the maximum 14C age of ~54000 years BP that can be measured with radiocarbon. (Source: Produce defined)
    Range of values
    Minimum:1220
    Maximum:49700
    Units:years before present
    14C age error (years BP)
    One standard deviation error of 14C age measurement in per mille. “n.d.” indicates sample had no data for the associated attribute. (Source: Produce defined)
    Range of values
    Minimum:15
    Maximum:1600
    Units:years before present
    Calibrated age (Cal years BP)
    calibrated carbon 14 age in years before present (Source: Produce defined)
    Range of values
    Minimum:515
    Maximum:54911
    Units:calibrated years before present
    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 5)
    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.
    Date: 20-Mar-2021 (process 2 of 5)
    Where suitable material was present in important sediment layers, samples were collected and sent to the U.C. Irvine Keck Carbon Cycle Accelerator Mass Spectrometer facility (KCCAMS) for radiocarbon dating. Data reported in the .csv file follow conventions described in Stuiver and Polach (1977). Person who carried out this activity:
    Keck Carbon Cycle Accelerator Facility
    University of California, Irvine
    2222B Croul Hall
    Irvine, CA

    949-824-3674 (voice)
    jsouthon@uci.edu
    Date: 2022 (process 3 of 5)
    Radiocarbon measurements from KCCAMS were used to calculate calibrated ages depending on the sampled material. Ages obtained from shells were calibrated using the Marine20 calibration curve of Heaton and others (2020) and wood fragments were calibrated using the IntCal20 calibration curve of Reimer and others (2020) within the Calib 8.2 program http://calib.org.
    Date: 04-Jan-2023 (process 4 of 5)
    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 5 of 5)
    Added most up to date C14 data for cores 7, 8, and 12 as of August 2023 (grsnyder@usgs.gov).
  3. What similar or related data should the user be aware of?
    Stuiver, Minze, and Polach, Henry A., 1977, Discussion: Reporting of 14C data.

    Online Links:

    Other_Citation_Details:
    Minze, S., and Polach, H.A., 1977, Discussion: Reporting of 14C data: American Journal of Science, vol. 19, p. 355-363.
    Heaton, Timothy J., Kohler, Peter, Butzin, Martin, Bard, Edouard, Reimer, Ron W., Austin, William E.N., Ramsey, Christopher Bronk, Grootes, Pieter M., Hughen, Lonrad A., and Kromer, Bernd, 2020, Marine20—The marine radiocarbon age calibration curve (0-55,000 cal BP).

    Online Links:

    Other_Citation_Details:
    Heaton, T.J., Kohler, P., Butzin, M., Bard, E., Reimer, R.W., Austin, W.E.N., Ramsey, C.B., Grootes, P.M., Hughen, L.A., and Kromer, B., 2020, Marine20—The marine radiocarbon age calibration curve (0-55,000 cal BP): Radiocarbon, vol. 62, p. 779-820.
    Reimer, Paula J., Austin, William E.N., Bard, Edouard, Bayliss, Alex, Blackwell, Paul G., Ramsey, Christopher Bronk, Butzin, Martin, Cheng, Hai, Edwards, R. Lawrence, Friedrich, Michael, and Grootes, Pieter M., 2020, The IntCal20 Northern Hemisphere radiocarbon age calibration curve (0–55 cal kBP).

    Online Links:

    Other_Citation_Details:
    Reimer, P.J., Austin, W.E., Bard, E., Bayliss, A., Blackwell, P.G., Ramsey, C.B., Butzin, M., Cheng, H., Edwards, R.L., Friedrich, M., and Grootes, P.M., 2020, The IntCal20 Northern Hemisphere radiocarbon age calibration curve (0–55 cal kBP): Radiocarbon, vol. 62, p.725-757.

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? Radiocarbon age data are provided in a comma-delimited text file (2019-651-FA_cores_C14.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 radiocarbon age data. in format comma-delimited text Size: 0.003
      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?
    Radiocarbon 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_C14_metadata.faq.html>
Generated by mp version 2.9.51 on Fri Sep 15 14:20:46 2023