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 20240615 JPEG data release DOI:10.5066/P9W5RAL4 Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey https://doi.org/10.5066/P9W5RAL4 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 2024 data release DOI:10.5066/P9W5RAL4 Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey Suggested Citation: Snyder, G.R., Balster-Gee, A.F., Brothers, D.S., Singleton, D.M., Padgett, J.S., Hill, J.C., Ritchie, A.C., La Selle, S.M., Kluesner, J.W., Sherrod, B., Powers, D.C., Dal Ferro, P., and Currie, J.E., 2024, Seismic sub-bottom, sediment core, and radiocarbon data collected in Ozette Lake, Washington: U.S. Geological Survey data release, https://doi.org/10.5066/P9W5RAL4. https://doi.org/10.5066/P9W5RAL4 Seismic-reflection data and cores were collected in Ozette Lake, Washington, from 2019 to 2021. These data were used to investigate submarine landslide deposits triggered by large Cascadia Subduction Zone earthquakes. 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 Ozette Lake, 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. 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. 20191018 20210830 Ground conditions at time data were collected In work As needed -124.667850 -124.607701 48.150990 48.051844 USGS Metadata Identifier USGS:9004e443-35f4-4f48-8c7f-c486e5482159 ISO 19115 Topic Category inlandWaters geoscientificInformation location Data Categories for Marine Planning substrate USGS Thesaurus geochemistry core analysis geospatial datasets Marine Realms Information Bank (MRIB) keywords data processing 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 Geographic Names Information System (GNIS) Pacific Ocean State of Washington Ozette Lake Ozette River None Olympic Wilderness No access 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. 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 VC-04.2019-622-FA.photoscan.jpg Example photoscan of vibracore VC-04 collected during field activity 2019-622-FA from Ozette Lake, Washington. JPEG Core photographs were taken using a Geotek multi-sensor core logger (MSCL) system. Quality control of attribute accuracy was conducted during field data collection, core processing workflows, and in compilation of this data release. No formal logical consistency tests were conducted. 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. Peter Dartnell Daniel S. Brothers Andrew C. Ritchie Brian Sherrod Jackson E. Currie Peter Dal Ferro Daniel C. Powers 2024 Raster Digital Dataset online U.S. Geological Survey https://doi.org/10.5066/P9U91FSB online database 20190714 20190717 ground condition at time data were collected. Dartnell and others, 2024 High resolution bathymetry data Sediment cores were collected throughout Ozette Lake, WA during USGS field activity 2019-622-FA and 2021-641-FA using either a vibracorer (VC- labeled core ID), a gravity corer (GC- labeled core ID), or a mini-hammer corer (BC- labeled core ID). Water depths were derived from high resolution bathymetry (Dartnell and others, 2024). Sediment cores were sent to USGS Pacific Coastal and Marine Science Center (PCMSC) for processing and archiving. At PCMSC, cores were split and photographed using a Geotek multi-sensor core logger (MSCL) system. Cores over 1.5 m in length were split into multiple sections to permit scanning. Images from the scanner had ruler scales appended using the Geotek Add Ruler v 1.4 software and then multi-section core images were recombined and converted to JPEG using imagemagick command line tools. 20220826 Point Point 84 0.000001 0.000001 Decimal Degrees WGS 1984 WGS 84 6378137.0 298.257224 Local surface 0.001 meters Attribute values Three zip folders of core photographs divided by core type in JPEG format. Location information for each sediment core can be found in the OzetteLake.core.location.information.csv included in this data release. Core photograph filenames are formatted as VC-##.2019-622-FA.photoscan.jpg (vibracores), BC-##.2021-641-FA.photoscan.jpg (bob cores), or GC-##.2019-622-FA.photoscan.jpg (gravity cores). U.S. Geological Survey U.S. Geological Survey - CMGDS mailing and physical

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Santa Cruz CA 95060 1-831-427-4747 pcmsc_data@usgs.gov Three zip folders of core photographs divided by core type in JPG format accompanied by CSDGM FGDC compliant metadata. Location information for each sediment core can be found in the OzetteLake.core.information.csv included in this data release. Core photograph filenames are formatted as VC-##.2019-622-FA.photoscan.jpg (vibracores), BC-##.2021-641-FA.photoscan.jpg (bob cores), or GC-##.2019-622-FA.photoscan.jpg (gravity cores). Note that rulers appended to images are provided for scale only and do not necessarily correlate with length measurements in the tabular data provided with this data release (for example the length along a core where a radiocarbon sample was collected). Users are advised to use the rulers as a scale to make length measurements along the core. 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. JPEG Zip file contains photographs of each core in JPEG format. Zip files may be decompressed with any zip utility (for example, 7zip, WinZip, Archive Utility). 332.8 https://doi.org/10.5066/P9W5RAL4 Bob core photoscans (2021-641-FA.bobcore.photoscan.zip) can be downloaded by using the Network_Resource_Name link and scrolling to the Imagery data section. JPEG Zip file contains photographs of each core in JPEG format. Zip files may be decompressed with any zip utility (for example, 7zip, WinZip, Archive Utility). 14.6 https://doi.org/10.5066/P9W5RAL4 Gravity core photoscans (2019-622-FA.gravitycore.photoscan.zip) can be downloaded by using the Network_Resource_Name link and scrolling to the Imagery data section. JPEG Zip file contains photographs of each core in JPEG format. Zip files may be decompressed with any zip utility (for example, 7zip, WinZip, Archive Utility). 258.8 https://doi.org/10.5066/P9W5RAL4 Vibracore photoscans (2019-622-FA.vibracore.photoscan.zip) can be downloaded by using the Network_Resource_Name link and scrolling to the Imagery data section. None. Core photographs can be viewed with any standard image software. 20240615 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