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 Chirp seismic reflection data in SEG-Y format and navigation polylines in Shapefile format. 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 Chirp seismic reflection data and associated navigation files were collected in Ozette Lake, Washington, in 2019 for use in regional earthquake hazard assessments relating the Cascadia Subduction Zone. Dataset includes both raw and processed chirp data. 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 Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology. 20190714 20190803 Ground conditions at time data were collected In work As needed -124.607344 -124.668633 48.152533 48.039542 USGS Metadata Identifier USGS:e326ce6a-b4a1-4b9c-a957-944178de2b38 ISO 19115 Topic Category oceans geoscientificInformation location Data Categories for Marine Planning substrate USGS Thesaurus marine geophysics sub-bottom profiling geospatial datasets sub-bottom profiling marine geophysics Marine Realms Information Bank (MRIB) keywords data processing seismic reflection profiling Global Positioning System (GPS) observations 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 2019-622-FA seismic reflection 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. This information is not intended for navigation purposes. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov 2019-622-FA_seismic_chirp.jpg Example image of 2019-622-FA chirp seismic data. JPG Field seismic data was collected with EdgeTech Discover acquisition software and processed using Shearwater Reveal (v. 5.1) on a CentOS Linux 7 operating system. Seismic tracklines were processed using ArcGIS Pro (v. 2.9.1) on a Windows 10 operating system. Quality control of attribute accuracy was conducted during field data collection and processing workflows. All SEG-Y and navigation data were derived from the same instruments and processing workflows. 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. Data release will be updated as additional data is processed. A Hemisphere V110 GPS system was used for obtaining navigation data during the cruise with a stated accuracy of 0.6 meters (95 percent confidence). Field seismic data collection: Seismic data was collected during USGS field activity 2019-622-FA using an EdgeTech SB-512 CHIRP sub-bottom profiler and Discover seismic acquisition software. Field data were collected in JSF and SEG-Y formats. Navigation data was collected simultaneously with a Hemisphere V110 GPS and saved into the seismic headers during acquisition. 20191024 The following processing flow was carried out in Shearwater Reveal (v. 5.1) to process field data output to SEG-Y files: (1) Field-collected SEG-Y files were imported to Shearwater Reveal and navigation was converted to WGS 1984 UTM Zone 10 North. These coordinates are populated in the seismic trace headers in bytes 73 and 77. SEG-Y files were added to the data zip file (2019-622-FA.seismic.chirp.zip). 20230826 point point 14 WGS 1984 UTM Zone 10N 0.9996 -123.0 0.0 500000.0 0.0 coordinate pair 0.0001 0.0001 Meter WGS 1984 WGS 84 6378137.0 298.257224 Zip archive of seismic shots with time stamp in standard SEG-Y format. Society of Exploration Geophysicists (SEG) Technical Standards, available for download at http://seg.org/Publications/SEG-Technical-Standards]. U.S. Geological Survey - CMGDS mailing and physical

2885 Mission Street

Santa Cruz CA 95060 1-831-427-4747 pcmsc_data@usgs.gov Seismic data are available in SEG-Y format (2019-622-FA_seismic_chirp.zip). SEG-Y files contain UTM zone 10N navigation in header bytes 73 and 77. 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. SEG-Y SEG-Y rev 1 Zip file contains processed seismic data per single navigation line Zip files may be decompressed with any zip utility (e.g., 7zip, WinZip, Archive Utility). 2400 https://doi.org/10.5066/P9W5RAL4 Data can be downloaded using the Network_Resource_Name link and scrolling to 2019-622-FA_seismic_chirp.zip None. Viewing SEG-Y data requires specialized software. A list of common SEG-Y processing and visualization software is available here: (http://www.oilfieldwiki.com/wiki/List_of_free_geophysics_software). 20240615 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

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