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 comma-delimited text 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 https://doi.org/10.5066/P9W5RAL4 This dataset includes multi-sensor core logger (MSCL) data from sediment cores collected in Lake Ozette, Washington. The sediment cores were collected during USGS field activities 2019-622-FA and 2021-641-FA for investigating 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 Lake Ozette, 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 -124.66785 -124.607701 48.15099 48.051844 USGS Metadata Identifier USGS:df37acd4-f390-4473-a3e8-c86659812b2d ISO 19115 Topic Category oceans geoscientificInformation Data Categories for Marine Planning substrate USGS Thesaurus core analysis coastal processes geospatial datasets 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 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

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Quality control of attribute accuracy was conducted during field data collection, processing workflows, and in compilation of this data release. No formal logical consistency tests were conducted. MSCL data values are sometimes inaccurate where there is air within the core section (usually near the start and end of core sections) due to the multi-sensor core logger’s calibration to expect sediment. This may result in nonsensical data values such as negative densities and P-wave velocities. 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. No MSCL data are available for vibracores VC-16 and VC-34. Vibracores (VC- labeled core IDs) were collected using a Rossfelder P-5 vibracorer during USGS field activity 2019-622-FA and bob cores (BC- or -BC labeled core IDs) were collected using a mini-hammer corer during USGS field activity 2021-641-FA. The cores were transported back to the USGS Pacific Coastal and Marine Science Center core lab for splitting and archiving and subsequent analyses. 2021 Multi-sensor core logger (MSCL) data were acquired on a Geotek MSCL-S system (https://www.geotek.co.uk/products/mscl-s/). Each core was scanned through the system which records core thickness, p-wave amplitude, p-wave velocity, density, magnetic susceptibility, and acoustic impedance. Users are advised to review the data carefully as measurement intervals and measurements taken vary among cores. No data values are noted by ‘n.d.’ values and often occur near the start and end of core sections. 2021 Point Point 13459 0.000001 0.000001 Decimal Degrees WGS 1984 WGS 84 6378137.0 298.257224 Local surface 0.001 meters Attribute values OzetteLake.core.MSCL.csv Comma-delimited text file containing multi-sensor core logger data for core samples. Producer defined Core Name Core number as assigned in the lab. VC denotes vibracore and BC for bobcore (aka percussion core) followed by core number (for example, VC-01 is vibracore 1 and BC-101 is bobcore 101). Producer defined Unique identifier for the sample used given in the field. These are explicitly defined in the core information section csv file ‘OzetteLake.core.location.information.csv’ from this same data release. Section Number Depth in core that each measurement was taken. producer defined 1 2 count of section numbers Section Depth (cm) Depth in core that each measurement was taken. producer defined 0 154.5 cm (centimeters) CT (cm) Approximate thickness of core sediments. producer defined 5.793 8.692 cm (centimeters) PWAmp (mv/V) P-wave amplitude of sediment in sample interval. In units of RMS value of mV transmitted through core per voltage applied. Values of "n.d." indicate no data. producer defined 0 0.0119 mV/V (millivolts per volts applied) PWVel (m/s) P-wave velocity of sediment in sample interval. Values of "n.d." indicate no data. producer defined 448.1962 4147.509 m/s (meters per second) Den1 (g/cc) Gamma density of sediment in sample interval. Producer defined -0.5121 2.473 g/cc (grams per cubic centimeter) MS1 (SI x 10^-5) Magnetic susceptibility of sediment in sample interval. Values of "n.d." indicate no data. Producer defined -4.6655 262.5239 SI units times 10^-5 Imp (kg/sm^2 x 10^-5) Acoustic impedance of sediment in sample interval. Values of "n.d." indicate no data. Producer defined -1060.823 7018.649 kg/(s*m^2) x 10^3 (kilograms per second meter squared times 10^-5) FP Fractional porosity of sediments. Values of "n.d." indicate no data. Producer defined -0.7944 1.848 Fractional Porosity is a unitless ratio defined as (MGD-GD1)/(MGD-WD) where MGD is mineral grain density, GD1 is the Gamma Density as recorded by the MSCL, and WD is pore fluid density. The first line of the csv file is a header line. Location information for each sediment core can be found in the OzetteLake.core.location.information.csv included in this data release. U.S. Geological Survey U.S. Geological Survey - CMGDS mailing and physical

2885 Mission Street

Santa Cruz CA 95060 1-831-427-4747 pcmsc_data@usgs.gov Multi-sensor core logger data are provided in a csv format (OzetteLake.core.MSCL.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 2023 Comma-delimited text file of multi-sensor core logger data. 0.7971 https://doi.org/10.5066/P9W5RAL4 Data can be downloaded using the Network_Resource_Name link and scrolling to the MSCL data section and selecting the OzetteLake.core.MSCL.csv data file for download. None. MSCL data in comma-delimited text format can be viewed with any standard table editing software (for example, Excel, Numbers). 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