Alicia F. Balster-Gee Daniel S. Brothers Brian Sherrod Andrew C. Ritchie Peter Dal Ferro 20240126 seismic-reflection data in SEG-Y format data release DOI:10.5066/P9DR46DI Pacific Coastal and Marine Science Center, Santa Cruz, California U.S. Geological Survey Suggested Citation: Balster-Gee, A.F., Brothers, D.S., Sherrod, B., Ritchie, A.C., Dal Ferro, P., 2024, Chirp sub-bottom data collected in Lake Crescent, Washington during USGS field activity 2019-622-FA: U.S. Geological Survey data release, https://doi.org/10.5066/P9DR46DI. https://doi.org/10.5066/P9DR46DI Chirp sub-bottom data were collected by the U.S. Geological Survey in August of 2019 in Lake Crescent, Washington. Chirp sub-botttom data were acquired during USGS field activity 2019-622-FA in August of 2019. The survey was conducted in Lake Crescent, Washington. Geophysical mapping was conducted to investigate earthquake triggered mass transport deposits as part of the Cascaadia Earthquake recurrence project. These data and information are intended for science researchers, students, policy makers, and the general public. Additional information about the field activity or activities 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 dataset in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology. 20190801 20210803 ground condition at time data were collected Complete None planned -123.91462 -123.74931 48.09154 48.05117 USGS Metadata Identifier USGS:d4f2bfa6-2785-400b-94de-45539b11b01d ISO 19115 Topic Category geoscientificInformation Data Categories for Marine Planning substrate USGS Thesaurus marine geophysics sub-bottom profiling geospatial datasets Marine Realms Information Bank (MRIB) keywords seismic reflection profiling Global Positioning System (GPS) observations lake None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC seismic navigation seismic reflection SEG-Y traces Geographic Names Information System (GNIS) Pacific Ocean State of Washington Piedmont Lake Crescent None Olympic National Park None 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 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

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Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov 2019-622-FA.chirp.preview.png Map of chirp tracklines acquired during USGS field activity 2019-622-FA PNG The authors acknowledge all those involved in in survey planning and execution. For the chirp data acquisition, an Edgetech 512i chirp towfish was towed several meters below the sea surface from the stern of the vessel. Shearwater Reveal 4 (seismic processing software) was used to convert the SEG-Y navigation to UTM zone 10N. Dartnell, P. Warrick, J.A. Wegmann, K.W. 2017 Dartnell, P., Warrick, J.A., and Wegmann, K.W., 2017, Multibeam bathymetry and acoustic backscatter data collected in 2016 for Lake Crescent, Olympic National Park, Washington: U.S. Geological Survey data release, https://doi.org/10.5066/F7B56GW5. https://www.sciencebase.gov/catalog/item/586d3165e4b0f5ce109faa5. Preliminary multibeam and acoustic backscatter data collected in 2017 by the USGS linked here for user interest. https://doi.org/10.5066/F7B56GW5. Quality control was conducted during acquisition. Some seismic profiles have gaps in them due to system crashes or intentional shutdowns. Minor swell can be observed in this unprocessed chirp data. Quality control was conducted during acquisition and processing to ensure consistency of SEG-Y header navigation and seismic-reflection data that matches bathymetry along the tracklines. 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. The chirp positional data was provided by a Hemisphere V110 series (Differential GPS) positioning system with a manufacturer’s stated accuracy of 0.6 meters (95 percent ). Accuracies of final products may be lower due to total propagated uncertainties of the mapping systems, which include position and motion compensation system, navigation and the chirp source layback from the stern of the vessel. Raw SEG-Y format seismic shots were imported into Shearwater Reveal 4 (seismic software) and navigational data was converted to UTM zone 10N and stored in header bytes 81 ad 85. SEG-Y files were named 2019-622-FA.chirp.###.segy where ### is the line number and 2019-622-FA is the USGS survey identifier. SEG-Y files were zipped into the file 2019-622-FA.chirp.segy.zip . 20231117 Point Point 94 WGS 1984 UTM Zone 10N 0.9996 -123.0 0.0 500000.0 0.0 coordinate pair 0.0001 0.0001 Meter D_WGS_1984 WGS_1984 6378137.0 298.257223563 Seismic Shots with Time Stamp in standard SEG-Y file 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

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Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Resource_Description: These data are available in SEG-Y format (2019-622-FA.chirp.###.segy where ### is the line number) and are contained in a single zip file (2019-622-FA.chirp.segy.zip) 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. SEG-Y SEG-Y rev 1 Zip file contains the processed seismic data per navigation line. The zip file can be decompressed with any zip utility (for example, 7zip, Keka, WinZip). 4200 https://doi.org/10.5066/P9DR46DI Data and metadata can be downloaded using the Network_Resource_Name link and scrolling to the Sparker Data section and selecting the 2021-614-FA.chirp.zip link. None. Use of SEG-Y data requires specialized software, such as ProMax and Seisworks by Landmark Geophysical; FOCUS and SeisX by Paradigm Geophysical; SPW by Parallel Geoscience; VISTA by Seismic Image Software; SeiSee by Dalmorneftegeophysica (DMNG); amongst others. 20240126 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