1. Coastal/Marine Hazards and Resources
  2. Data System
  3. Data Releases
  4. Data Release 10.5066/P9LBG9H5

Geophysical and core sample data collected offshore San Francisco, California, during field activity 2019-649-FA from 2019-10-11 to 2019-10-18

By Ray W. Sliter, James E. Conrad, Thomas D. Lorenson, Antoinette G. Papesh, Alicia F. Balster-Gee, Janet T. Watt, and Jonathan A. Warrick

https://doi.org/10.5066/P9LBG9H5

Dates

Published: June 10, 2021

Data Collected: Oct. 11, 2019 – Oct. 18, 2019

Summary

The U.S. Geological Survey (USGS) collected geophysical and core sample data aboard the R/V Bold Horizon in 2019 on cruise 2019-649-FA offshore San Francisco, California. The data were collected to assess sand and gravel resources in Federal and State waters for potential use in future beach nourishment projects along stretches of the coast where critical erosion hotspots have been identified. This cruise was funded through partnerships with the Bureau of Ocean Energy Management (BOEM) and the State of California Ocean Protection Council (OPC).

Magnetic Data

Sampling Data

  • Core logger data from vibracores collected offshore San Francisco, California, during field activity 2019-649-FA from 2019-10-11 to 2019-10-18

    This section of the data release contains core logger tabular data of 34 vibracores that were collected aboard the R/V Bold Horizon in 2019 on U.S. Geological Survey Field Activity 2019-649-FA offshore San Francisco, California. The cores were analyzed for gamma ray density and magnetic susceptibility. The logging was performed at 1-cm intervals from the top of each core section. In addition to the core logger data, the locations of the cores are available as either a comma-delimited file or a shapefile.

    Preview of dataset
    Geophysical tracklines and core locations
  • Photographs of vibracores collected offshore San Francisco, California, during field activity 2019-649-FA from 2019-10-11 to 2019-10-18

    This section of the data release contains photographs of 34 vibracores that were collected aboard the R/V Bold Horizon in 2019 on U.S. Geological Survey Field Activity 2019-649-FA offshore San Francisco, California. Continuous line-scan photographs were created in the lab to assess sand and gravel resources in Federal and State waters for potential use in future beach nourishment projects along stretches of the coast where critical erosion hotspots have been identified.

    Preview of dataset
    Map showing vibracore locations and gephysical tracklines
  • Sediment grain-size data from vibracore samples collected offshore San Francisco, California, during field activity 2019-649-FA from 2019-10-11 to 2019-10-18

    This section of the data release contains grain-size and total organic carbon (TOC) analyses of 132 samples taken from vibracores that were collected aboard the R/V Bold Horizon in 2019 on U.S. Geological Survey Field Activity 2019-649-FA offshore San Francisco, California. The samples were analyzed for percent weight of grain size and total organic carbon. The samples were taken at approx. 50 cm intervals from (and including) the core-catcher, which represents the bottom of the core.

    Preview of dataset
    Map showing vibracore locations

Seismic Data

  • High-resolution chirp seismic-reflection data collected offshore San Francisco, California, during field activity 2019-649-FA from 2019-10-11 to 2019-10-18

    This part of the data release contains approximately 783 line-kilometers of processed, high-resolution, chirp seismic-reflection data that were collected aboard the R/V Bold Horizon in 2019 on U.S. Geological Survey cruise 2019-649-FA offshore San Francisco, California. The chirp profiles were acquired using an Edgetech 3200 5-16 chirp sub-bottom profiling system. These data are divided up and presented by navigation line, as reflected in the individual file names.

    Data Files

    2019-649-FA_chirp.zip - 18.2 GB

    Metadata Files

    2019-649-FA_chirp_metadata.xml - 14.9 KB

    2019-649-FA_chirp_metadata.txt - 14.5 KB

    Preview of dataset
    Map of Chirp seismic-reflection tracklines

Related Field Activities

  • 2019-649-FA - View Details

    • Suggested Citation

    Sliter, R.W., Conrad, J.E., Lorenson, T.D., Papesh, A.G., Balster-Gee, A.F., Watt, J.T., and Warrick, J.A., 2021, Geophysical and core sample data collected offshore San Francisco, California, during field activity 2019-649-FA from 2019-10-11 to 2019-10-18: U.S. Geological Survey data release, https://doi.org/10.5066/P9LBG9H5.

San Francisco Study Area

Overview image of data release
Map showing study area with geophysical tracklines and core locations

Overview Map