Jenna C. Hill SeanPaul M. La Selle Janet T. Watt Nora M. Nieminski Alicia F. Balster-Gee Peter Dal Ferro Jason S. Padgett Daniel C. Powers Rachel K. Marcuson George R. Snyder 20250326 CSV format tabular data data release DOI:10.5066/P1VQIJ2Q Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P1VQIJ2Q Jenna C. Hill SeanPaul M. La Selle Janet T. Watt Nora M. Nieminski Alicia F. Balster-Gee Peter Dal Ferro Jason S. Padgett Daniel C. Powers Rachel K. Marcuson George R. Snyder 2025 data release DOI:10.5066/P1VQIJ2Q Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey Suggested Citation: Hill, J.C., La Selle, S.M., Watt, J.W., Nieminski, N.M., Balster-Gee, A.F., Dal Ferro, P., Padgett, J.S., Powers, D.C., Marcuson, R.K., and Snyder, G.R., 2025, Sediment core data from offshore Cascadia during field activity 2022-653-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P1VQIJ2Q. https://doi.org/10.5066/P1VQIJ2Q This dataset presents core information such as core IDs, section numbers, lengths, depth intervals, and locations from sediment cores collected in Cascadia (offshore northern California, Oregon, and Washington) aboard the M/V Bold Horizon September 2022. An inventory of core section computed tomography (CT), multi-sensor core logger (MSCL), and photograph scan files available in this data release are listed here. As part of a multi-year project focused on characterizing offshore marine geohazards (tsunamis, earthquakes, and landslides), the U.S. Geological Survey (USGS) Coastal and Marine Hazards and Resources Program is conducting research offshore northern California, Oregon, and Washington to gain a better understanding of the geologic hazards of the region, improve risk assessments for local communities and critical infrastructure, and to provide data for future research on regional tectonic, sedimentary, and geomorphic evolution. Sediment cores were collected to enable a detailed investigation of Cascadia's geologic history and ongoing activity. 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=2022-653-FA Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. 20220918 20230504 Ground conditions at the time data were collected Complete None planned -125.215927 -124.723058 41.711749 41.374695 USGS Metadata Identifier USGS:6f9a5889-3d9e-4310-a88a-e2198c387a60 USGS Thesaurus core analysis ocean processes sediment transport ISO 19115 Topic Category oceans geoscientificInformation Data Categories for Marine Planning substrate Marine Realms Information Bank (MRIB) keywords sediment None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC Department of the Interior DOI field activity number 2022-653-FA Geographic Names Information System (GNIS) Pacific Ocean State of California State of Oregon State of Washington Humboldt County Eureka No access constraints USGS-authored or produced data and information from the U.S. Government are in the public domain 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. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

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Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Dartnell, P. Conrad, J.E. Watt, J.T. Hill, J.C. 2021 Dartnell, P., Conrad, J.E., Watt, J.T., and Hill, J.C., 2021, Composite multibeam bathymetry surface and data sources of the southern Cascadia Margin offshore Oregon and northern California: U.S. Geological Survey data release, https://doi.org/10.5066/P9C5DBMR https://doi.org/10.5066/P9C5DBMR Dartnell, P. Watt, J.T. Hill, J.C. Conrad, J.E. 2023 Dartnell, P., Watt, J.T., Hill, J.C., and Conrad, J.E., 2023, Composite multibeam bathymetry surface and data sources of the central Cascadia Margin offshore Oregon: U.S. Geological Survey data release, https://doi.org/10.5066/P9PERGFK https://doi.org/10.5066/P9PERGFK Ryan, W.B.F. Carbotte, S.M. Coplan, J.O. O’Hara, A.M. Melkonian, A. Arko, R. Weissel, R.A. Goodwillie, A. Nitsche, F. Bonczkowski, J. Zemsky, R. 2009 Originator: Ryan, W.B.F., Carbotte, S.M., Coplan, J.O., O’Hara, A.M., Melkonian, A., Arko, R., Weissel, R.A., Goodwillie, A., Nitsche, F., Bonczkowski, J., Zemsky, R., 2009, Global Multi-Resolution Topography synthesis: Geochemistry, Geophysics, Geosystems, v. 10, n. 3, p. 9, https://doi.org/10.1029/2008GC002332 https://doi.org/10.1029/2008GC002332 No formal attribute accuracy tests were conducted. No formal logical consistency tests were conducted. Dataset is considered complete for the information presented, as described in the abstract. Users are advised to carefully read the rest of the metadata record for additional details. Some cells are intentionally left blank if there was no recovery of the core or other issues with core quality. These issues are noted in the ‘notes’ column. A Hemisphere V110 GPS system was used to obtain latitude and longitude point locations during the field activity, with a stated accuracy of 0.6 meters (95 percent confidence). Water depth values at core locations were estimated from multibeam bathymetric data (Dartnell and others (2021), or Dartnell and others (2023), or Ryan and others (2009)). No formal vertical accuracy tests were conducted. Cores were collected aboard MV Bold Horizon using a U.S. Geological Survey (USGS) jumbo piston corer (JPC) on cruise 2022-653-FA. The JPC system consisted of a 2500-lb head weight, 8.71-centimeter diameter barrel, and polybutyrate liner. The JPC trigger arm was set up to collect a trigger core (TC) associated with each JPC (if successful). Gravity cores (GC) were collected using the same JPC system (minus trigger and TC) in two localities. JPCs and GCs were extruded and sectioned at sea. The cores were then transported back to the USGS Pacific Coastal and Marine Science Center. 2022 Cores were scanned, split, and sampled at the USGS Pacific Coastal and Marine Science Center core lab in Santa Cruz, CA. Information about the cores were combined into a comma-delimited text value document (2022-653-FA_cores.csv). 2022 CT TIFF images, line scan photo TIFF images, and MSCL CSV files were renamed for consistency with other datasets in this data release (Hill and others (2025)). 2025 Point Point 20 0.000001 0.000001 Decimal degrees WGS 1984 WGS 84 6378137.0 298.257224 Local surface for water depth 1.0 meters Attribute values 2022-653-FA_cores.csv Comma separated value (.csv) text file with name, location, and length/depth information for each core section, is provided, along with an inventory of CT, MSCL, and line scan files associated with 2022-653-FA. Producer defined core_id The unique identifier for a core site. Producer Defined Identifier for the type of core (for example, JPC- for jumbo piston core, TC- for trigger core) followed by a unique number for the core site. section_number Section number of core. Producer Defined 1 6 sections section_length_cm Length of an individual core section. Producer Defined 43 153 cm section_top_cm Depth at top of core section in centimeters. If blank, core was not used for analyses or not recovered. Producer Defined 0 638 cm section_bottom_cm Depth at bottom of core section in centimeters. If blank, core was not used for analyses or not recovered. Producer Defined 43 791 cm total_core_length_cm Sum of all section lengths in a core. If blank, core was not used for analyses or not recovered. Producer defined 80 791 cm latitude Latitude of sample in decimal degrees, North Onboard Hemisphere V110 GPS 41.374695 41.711749 decimal degrees longitude Longitude of sample in decimal degrees, East Onboard Hemisphere V110 GPS -125.215927 -124.723058 decimal degrees water_depth_m Depth of seafloor at core location Estimated from position on bathymetry datasets (see vertical positional accuracy report). 1145 3116 meters date_collected Date of core collection in mm/dd/yyyy format. Producer defined 09/20/2022 09/21/2022 date ct_file_xz Filename of associated Tag Image File Format (TIFF) file of coronal (XZ) CT image of core section. Producer defined Filenames start with the field activity (FA) number (2022_653_FA) followed by the core id, section number, 'XZView' and end with .tif file extension. ct_file_yz Filename of associated TIFF file of saggital (YZ) CT image of core section. Producer defined Filenames start with the FA number (2022_653_FA) followed by the core id, section number, and 'YZView' and end with .tif file extension. photo_file Filename of associated TIFF file of core section photograph. Producer defined Filenames start with the FA number (2022_653_FA) followed by the core id and section number and end with .tif file extension. mscl_file Filename of associated CSV file containing MSCL data. Producer defined Filenames start with the FA number (2022_653_FA) followed by the core id and end with .csv file extension. The first line of the CSV file is a header line. Producer defined U.S. Geological Survey - CMGDS mailing and physical

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Santa Cruz CA 95060 1-831-427-4747 pcmsc_data@usgs.gov Core information is provided in a comma separated value (CSV) text file (2022-653-FA_cores.csv) accompanied by CSDGM FGDC-compliant metadata. 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. comma delimited text 2025 Comma separated value (csv) text file of core information. https://doi.org/10.5066/P1VQIJ2Q Data can be downloaded using the Network_Resource_Name link and scrolling to 2022-653-FA_cores.csv in the Sampling Data section. None. CSV files can be viewed with any standard table editing software (for example, excel, numbers). 20250326 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

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Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998